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Professor Iain Hartley

Professor of Terrestrial Ecosystem Science

4362

Amory C418

Amory Building, University of Exeter, Rennes Drive, Exeter, EX4 4RJ , UK

Office hours:

Term 1 Office Hours

Week 1: Thursday 13:00 to 14:00, Friday 13:00-14:00

Week 2: Monday 14:00 to 15:00, Tuesday 13:00-14:00

Week 3: Monday 14:00 to 15:00, Tuesday 13:00-14:00

Week 4: Monday 14:00 to 15:00, Tuesday 13:00-14:00

Week 5: Monday 14:00 to 15:00, Tuesday 13:00-14:00

Week 6: Monday 14:00 to 15:00, Tuesday 13:00-14:00

Week 7: Monday 14:00 to 15:00, Tuesday 13:00-14:00

Week 8: Monday 14:00 to 15:00, Tuesday 13:00-14:00

Week 9: Monday 14:00 to 15:00, Tuesday 13:00-14:00

Week 10: Monday 14:00 to 15:00, Tuesday 13:00-14:00

Week 11: Monday 14:00 to 15:00, Tuesday 13:00-14:00

Week 12: Monday 14:00 to 15:00, Tuesday 13:00-14:00

I will be hosting Office Hours via Zoom

Please contact me anytime via email to arrange a meeting during Office Hours

Overview

Iain Hartley's research focuses on the responses of terrestrial ecosystems to global change. He has worked in a wide range of ecosystems, from Arctic tundra to tropical rainforests. In particular, his research interests include: 1) determining the effects of permafrost thaw on greenhouse gas emissions from high-latitude ecosystems; 2) investigating the extent to which tropical forest productivity is limited by nutrient availability versus atmospheric CO2 concentrations; 3) quantifying the effects of global warming on soil and ecosystem carbon storage. Iain's research has been funded by the Natural Environment Research Council (NERC) and the UK Department of Energy and Climate Change (DECC), and he sits on the scientific steering committte of the AmazonFACE project, which will be the first experiment to expose a mature rainforest canopy to elevated CO2. He also currently serves on the NERC Radiocarbon Facility steering committee.

Broad research specialisms:

Carbon cycle feedbacks to global change, impacts of warming on soil carbon dynamics, links between carbon and nutrient cycling, permafrost carbon dynamics, elevated atmospheric CO2 concentrations, methane fluxes, managing the terrestrial carbon cycle.

Qualifications

BSc Environmental Biology (University of St Andrews),
MRes Ecology and Environmental Biology (University of York),
PhD “The response of soil respiration to temperature” (University of York)

Research group links

Landscape and ecosystem dynamics

Research

Research interests

The main focus of my research is on improving understanding of how the terrestrial biosphere will respond to global change, and what the implications will be for future rates of climate change.

I am primarily an experimental ecologist, using manipulations to quantify ecosystem responses to key drivers, but also make use of natural gradients and natural disturbances to test hypotheses related to global change. My research combines controlled laboratory experiments with field measurements in ecosystems as diverse as Arctic tundra and Amazon rainforest. I make extensive use of stable and radiocarbon isotopes to compliment measurements of fluxes (CO2, CH4) and stores of carbon in different ecosystems. My work is highly collaborative with ongoing projects involving hydrologists, plant physiologists, microbiologists, remote sensors, and soil scientists, as well as ecosystem and Earth system modellers.

Current projects include: 1) investigating how soil microbial community responses may modify the effects of temperature on decomposition rates in soils; 2) determining the role of plant biodiversity and fire disturbance in controlling the rates, and implications, of permafrost thaw in contrasting ecosystems in northern Canada; 3) quantifying the role of nutrient availability in controlling the productivity of Amazon forests; 4) investigating the potential effects of atmospheric CO2 concentration on C uptake in rainforests.

Specific research areas:
1.    Effects of temperature on decomposition rates in soils
2.    Elevated CO2 effects on plant productivity and ecosystem C storage
3.    Plant-soil interactions and nutrient-cycle influences on carbon-cycle feedbacks
4.    Permafrost carbon dynamics
5.    Methane fluxes in terrestrial ecosystems
6.    Soil microbial community responses to global change
7.    The use of radiocarbon in carbon cycle research

Research projects

NERC Standard Grant: NE/S010122/1, “Can the formation of new soil organic matter offset decomposition losses from thawed permafrost soils”. Total value: £640,000 (~£540,000 to Exeter, Hartley as project PI). June 2019-May 2023.This proposal will grow plant in contrasting permafrost soils in a 13C-labelled atmosphere to trace new carbon inputs into different soil organic matter pools.
NERC Standard Grant: NE/R001928/1, “Can tropical Montane forest Acclimate to high temperature? (Montane-Acclim)”. Total value: £641,000 (~£600,000 to Exeter, PI Lina Mercado, Hartley CoI). Oct 2017-Sept 2022. This proposal will use an altitudinal gradient to determine the extent to which photosynthesis in tropical trees can acclimate to climate warming.
NERC Standard Grant: NE/N010086/1, “Phosphorus Limitation And ecosystem responses to Carbon dioxide Enrichment (PLACE)”. Total value: £635,000 (£316,000 to Exeter, Hartley as project PI). Feb 2017-Dec 2020.This is the first combined free-air carbon dioxide enrichment (FACE) and nutrient manipulation experiment in phosphorus-limited grasslands.
NERC Standard Grant: NE/P002722/1, “Will more productive Arctic ecosystems sequester less soil carbon? A key role for priming in the rhizosphere ('PRIMETIME')". Total value: £635,000 (£11,000 to Exeter, Led by Philip Wookey at University of Stirling. Hartley as Exeter PI). September 2016-August 2019.This project will determine whether colonisation of ericaceous Arctic heaths by ectomycorrhizal trees and shrubs will destabilise soil carbon stocks.
NERC Directed Newton call: NE/N007603/1, “SPECTRE: Soil processes and ecological services of the karst critical zone of southwest China”. Total value: £900,000 (£468,000 to Exeter, PI Tim Quine, Hartley CoI). January 2016-Dec 2018.This project investigates whether karst agricultural systems in China can be managed to maximise ecosystem service delivery and poverty alleviation.
NERC Standard Grant: NE/L007223/1, 'The Amazon Fertilisation Experiment (AFEX)'. Total value: £925,000 (£624,000 to Exeter, Hartley as project PI). October 2014-March 2020.This is first experiment to expose mature Amazon rainforest to long-term, large-scale manipulations of soil nitrogen, phosphorus and cation availability.
NERC Strategic Environmental Capital Call, 'Picarro G2201-i Dual Carbon Isotope Analyzer'. Total value: £129,000 (Hartley ad lead academic). June 2014.This equipment bid has been essential for securing subsequent funding.
NERC Arctic Research Programme: NE/K000179/1, 'CYCLOPS: Carbon Cycling Linkages of Permafrost Systems'. Total value: £900,000 (£285,376 to Exeter, Led by Mathew Williams at University of Edinburgh. Hartley as Exeter PI). August 2012-July 2015.This project determined how vegetation communities control thermal regimes in permafrost soils and the potential for CO2 and CH4 release following thaw.
Department of Energy and Climate Change (DECC): 'Determining the role of permafrost thaw in controlling rates of methane release from terrestrial high-latitude ecosystems'. Two awards linked to CYCLOPS. (£164,849 to Exeter, Hartley as PI). May 2013-March 2015.This project determined, for the first time, the source of methane being released from thawing permafrost peatlands.
NERC Standard Grant: NE/H022333/1, 'Thermal acclimation of soil microbial respiration: consequences for global warming-induced carbon losses?'. Total value £453,000 (£269,634 to Exeter. Hartley as project PI). October 2010-December 2013.This project demonstrated that microbial community responses to temperature changes enhance the potential for carbon release under global warming.

Research grants

2016 NERC
Phosphorus Limitation And ecosystem responses to Carbon dioxide Enrichment (PLACE)
2015 NERC
SPECTRA: Soil Processes and Ecological Services in the Karst Critical Zone of Southwest China
2014 NERC
The Amazon Fertilisation Experiment (AFEX)
2014 InterAmerican Development Bank
Amazon FACE experiment
2013 DECC
Determining the role of permafrost thaw in controlling rates of methane release from terrestrial high-latitude ecosystems
2012 NERC
CYCLOPS: Carbon Cycling Linkages of Permafrost Systems: NERC Arctic Research Programme award
2010 NERC
Thermal acclimation of soil microbial respiration: consequences for global-warming-induced carbon losses?

Publications

Key publications | Publications by category | Publications by year

Key publications

Hartley IP, Hill TC, Wade TJ, Clement RJ, Moncrieff JB, Prieto-Blanco A, Disney MI, Huntley B, Williams M, Howden NJK, et al (2015). Quantifying landscape-level methane fluxes in subarctic Finland using a multiscale approach. Global Change Biology, 21(10), 3712-3725. Abstract. Full text.

Karhu K, Auffret MD, Dungait JAJ, Hopkins DW, Prosser JI, Singh BK, Subke J-A, Wookey PA, Agren GI, Sebastià M-T, et al (2014). Temperature sensitivity of soil respiration rates enhanced by microbial community response. Nature, 513(7516), 81-84. Abstract. Author URL. Full text.

Hartley I, Garnett MH, Sommerkorn M, Hopkins DW, Fletcher BJ, Sloan VL, Phoenix GK, Wookey PA (2013). A potential loss of carbon associated with greater plant growth in the European Arctic. Nature Climate Change, 2, 875-879.

Hartley IP, Hopkins DW, Garnett MH, Sommerkorn M, Wookey PA (2008). Soil microbial respiration in arctic soil does not acclimate to temperature. Ecol Lett, 11(10), 1092-1100. Abstract. Author URL.

Hartley IP, Ineson P (2008). Substrate quality and the temperature sensitivity of soil organic matter decomposition. Soil Biology and Biochemistry, 40(7), 1567-1574. Abstract. Full text.

Heinemeyer A, Hartley IP, Evans SP, Carreira De La Fuente JA, Ineson P (2007). Forest soil CO<inf>2</inf> flux: Uncovering the contribution and environmental responses of ectomycorrhizas. Global Change Biology, 13(8), 1786-1797.

Forests play a critical role in the global carbon cycle, being considered an important and continuing carbon sink. However, the response of carbon sequestration in forests to global climate change remains a major uncertainty, with a particularly poor understanding of the origins and environmental responses of soil CO2 efflux. For example, despite their large biomass, the contribution of ectomycorrhizal (EM) fungi to forest soil CO2 efflux and responses to changes in environmental drivers has, to date, not been quantified in the field. Their activity is often simplistically included in the 'autotrophic' root respiration term. We set up a multiplexed continuous soil respiration measurement system in a young Lodgepole pine forest, using a mycorrhizal mesh collar design, to monitor the three main soil CO2 efflux components: root, extraradical mycorrhizal hyphal, and soil heterotrophic respiration. Mycorrhizal hyphal respiration increased during the first month after collar insertion and thereafter remained remarkably stable. During autumn the soil CO2 flux components could be divided into ∼60% soil heterotrophic, ∼25% EM hyphal, and ∼15% root fluxes. Thus the extraradical EM mycelium can contribute substantially more to soil CO2 flux than do roots. While EM hyphal respiration responded strongly to reductions in soil moisture and appeared to be highly dependent on assimilate supply, it did not responded directly to changes in soil temperature. It was mainly the soil heterotrophic flux component that caused the commonly observed exponential relationship with temperature. Our results strongly suggest that accurate modelling of soil respiration, particularly in forest ecosystems, needs to explicitly consider the mycorrhizal mycelium and its dynamic response to specific environmental factors. Moreover, we propose that in forest ecosystems the mycorrhizal CO2 flux component represents an overflow 'CO2 tap' through which surplus plant carbon may be returned directly to the atmosphere, thus limiting expected carbon sequestration from trees under elevated CO2. © 2007 Blackwell Publishing Ltd.

Abstract.

Publications by category

Journal articles

Gatis N, Anderson K, Grand-Clement E, Luscombe D, Hartley I, Smith D, Brazier R (In Press). Evaluating MODIS vegetation products using digital images for quantifying local peatland CO2 gas fluxes. Remote Sensing in Ecology and Conservation Full text.

Lugli LF, Andersen KM, Aragao LEOC, Cordeiro AL, Cunha HFV, Fuchslueger L, Meir P, Mercado LM, Oblitas E, Quesada CA, et al (In Press). Multiple phosphorus acquisition strategies adopted by fine roots in low-fertility soils in Central Amazonia. Plant and Soil Full text.

Gatis N, Luscombe D, Grand-Clement E, Hartley I, Anderson K, Smith DM, Brazier RE (In Press). The effect of drainage ditches on vegetation diversity and CO2 fluxes in a Molinia caerulea dominated peatland. Ecohydrology Full text.

Wang Y, Dungait JAJ, Xing K, Green SM, Hartley I, Tu C, Quine TA, Tian J, Kuzyakov Y (2020). Persistence of soil microbial function at the rock-soil interface in degraded karst topsoils. LAND DEGRADATION & DEVELOPMENT, 31(2), 251-265. Author URL. Full text.

Van Langenhove L, Janssens IA, Verryckt L, Brechet L, Hartley IP, Stahl C, Courtois E, Urbina I, Grau O, Sardans J, et al (2020). Rapid root assimilation of added phosphorus in a lowland tropical rainforest of French Guiana. Soil Biology and Biochemistry, 140, 107646-107646. Full text.

Parker TC, Clemmensen KE, Friggens NL, Hartley IP, Johnson D, Lindahl BD, Olofsson J, Siewert MB, Street LE, Subke J-A, et al (2020). Rhizosphere allocation by canopy-forming species dominates soil CO2 efflux in a subarctic landscape. New Phytol Abstract. Author URL. Full text.

Xia S, Song Z, Van Zwieten L, Guo L, Yu C, Hartley IP, Wang H (2020). Silicon accumulation controls carbon cycle in wetlands through modifying nutrients stoichiometry and lignin synthesis of Phragmites australis. Environmental and Experimental Botany, 175 Abstract. Full text.

Gatis N, Benaud P, Ashe J, Luscombe D, Grand-Clement E, Hartley I, Anderson K, Brazier R (2019). ASSESSING THE IMPACT OF PEAT EROSION ON GROWING SEASON CO2 FLUXES BY COMPARING EROSIONAL PEAT PANS AND SURROUNDING VEGETATED HAGGS. Wetlands Ecology and Management, 1-19. Abstract. Full text.

Gatis N, Grand-Clement E, Luscombe DJ, Hartley IP, Anderson K, Brazier RE (2019). Growing season CO2 fluxes from a drained peatland dominated by Molinia caerulea. MIRES AND PEAT, 24 Author URL.

Tian J, Dungait JAJ, Lu X, Yang Y, Hartley IP, Zhang W, Mo J, Yu G, Zhou J, Kuzyakov Y, et al (2019). Long-term nitrogen addition modifies microbial composition and functions for slow carbon cycling and increased sequestration in tropical forest soil. Glob Chang Biol, 25(10), 3267-3281.

Nitrogen (N) deposition is a component of global change that has considerable impact on belowground carbon (C) dynamics. Plant growth stimulation and alterations of fungal community composition and functions are the main mechanisms driving soil C gains following N deposition in N-limited temperate forests. In N-rich tropical forests, however, N deposition generally has minor effects on plant growth; consequently, C storage in soil may strongly depend on the microbial processes that drive litter and soil organic matter decomposition. Here, we investigated how microbial functions in old-growth tropical forest soil responded to 13 years of N addition at four rates: 0 (Control), 50 (Low-N), 100 (Medium-N), and 150 (High-N) kg N ha-1 year-1. Soil organic carbon (SOC) content increased under High-N, corresponding to a 33% decrease in CO2 efflux, and reductions in relative abundances of bacteria as well as genes responsible for cellulose and chitin degradation. A 113% increase in N2 O emission was positively correlated with soil acidification and an increase in the relative abundances of denitrification genes (narG and norB). Soil acidification induced by N addition decreased available P concentrations, and was associated with reductions in the relative abundance of phytase. The decreased relative abundance of bacteria and key functional gene groups for C degradation were related to slower SOC decomposition, indicating the key mechanisms driving SOC accumulation in the tropical forest soil subjected to High-N addition. However, changes in microbial functional groups associated with N and P cycling led to coincidentally large increases in N2 O emissions, and exacerbated soil P deficiency. These two factors partially offset the perceived beneficial effects of N addition on SOC storage in tropical forest soils. These findings suggest a potential to incorporate microbial community and functions into Earth system models considering their effects on greenhouse gas emission, biogeochemical processes, and biodiversity of tropical ecosystems.

Abstract. Author URL. Full text.

Wu H, Lu L, Zhang Y, Xu C, Yang H, Zhou W, Wang W, Zhao L, He N, Smith MD, et al (2019). Sediment addition and legume cultivation result in sustainable, long-term increases in ecosystem functions of sandy grasslands. LAND DEGRADATION & DEVELOPMENT, 30(14), 1667-1676. Author URL. Full text.

Green SM, Dungait JAJ, Tu C, Buss HL, Sanderson N, Hawkes SJ, Xing K, Yue F, Hussey VL, Peng J, et al (2019). Soil functions and ecosystem services research in the Chinese karst Critical Zone. Chemical Geology, 527 Abstract.

Lopez-Sangil L, Hartley IP, Rovira P, Casals P, Sayer EJ (2018). Drying and rewetting conditions differentially affect the mineralization of fresh plant litter and extant soil organic matter. Soil Biology and Biochemistry, 124, 81-89.

© 2018 Elsevier Ltd Drought is becoming more common globally and has the potential to alter patterns of soil carbon (C) storage in terrestrial ecosystems. After an extended dry period, a pulse of soil CO2 release is commonly observed upon rewetting (the so-called ‘Birch effect’), the magnitude of which depends on soil rewetting frequency. But the source and implications of this CO2 efflux are unclear. We used a mesocosm field experiment to subject agricultural topsoil to two distinct drying and rewetting frequencies, measuring Birch effects (as 3-day cumulative CO2 efflux upon rewetting) and the overall CO2 efflux over the entire drying-rewetting cycle. We used 14C-labelled wheat straw to determine the contribution of fresh (recently incorporated) plant litter or extant soil organic matter (SOM) to these fluxes, and assessed the extent to which the amount of soil microbial biomass + K2SO4-extractable organic C (fumigated-extracted C, FEC) before rewetting determined the magnitude of Birch effect CO2 pulses. Our results showed a gradual increase in SOM-derived organic solutes within the FEC fraction, and a decrease in soil microbial biomass, under more extreme drying and rewetting conditions. But, contrary to our hypothesis, pre-wetting levels of FEC were not related to the magnitude of the Birch effects. In the longer term, rewetting frequency and temperature influenced the overall (31-day cumulative) amount of CO2–C released from SOM upon rewetting, but the overall 14CO2–C respired from fresh straw was only influenced by the rewetting frequency, with no effect of seasonal temperature differences of ∼15 °C. We conclude that the mineralization of fresh plant litter in soils is more sensitive to water limitations than extant SOM in soils under drying-rewetting conditions. Moreover, we found little evidence to support the hypothesis that the availability of microbial and soluble organic C before rewetting determined the magnitude of the Birch effects, and suggest that future work should investigate whether these short-term CO2 pulses are predominantly derived from substrate-supply mechanisms resulting from the disruption of the soil organo-mineral matrix.

Abstract. Full text.

Estop-Aragonés C, Cooper MDA, Fisher JP, Thierry A, Garnett MH, Charman DJ, Murton JB, Phoenix GK, Treharne R, Sanderson NK, et al (2018). Limited release of previously-frozen C and increased new peat formation after thaw in permafrost peatlands. Soil Biology and Biochemistry, 118, 115-129. Abstract. Full text.

Quine T, Guo D, Green SM, Tu C, Hartley I, Zhang X, Dungait J, Wen X, Song Z, Liu H, et al (2017). Ecosystem service delivery in Karst landscapes: anthropogenic perturbation and recovery. Acta Geochimica, 36(3), 416-420. Abstract. Full text.

Cooper MDA, Estop-Aragones C, Fisher JP, Thierry A, Garnett MH, Charman DJ, Murton JB, Phoenix GK, Treharne R, Kokelj SV, et al (2017). Limited contribution of permafrost carbon to methane release from thawing peatlands. Nature Climate Change, 7, 507-511. Full text.

De Baets S, Van de Weg MJ, Lewis R, Steinberg N, Meersmans J, Quine TA, Shaver GR, Hartley IP (2016). Investigating the controls on soil organic matter decomposition in tussock tundra soil and permafrost after fire. Soil Biology and Biochemistry, 99, 108-116.

© 2016 Elsevier Ltd. Rapid warming in Arctic ecosystems is resulting in increased frequency of disturbances such as fires, changes in the distribution and productivity of different plant communities, increasing thaw depths in permafrost soils and greater nutrient availability, especially nitrogen. Individually and collectively, these factors have the potential to strongly affect soil C decomposition rates, with implications for the globally significant stores of carbon in this region. However, considerable uncertainty remains regarding how C decomposition rates are controlled in Arctic soils. In this study we investigated how temperature, nitrogen availability and labile C addition affected rates of CO2 production in short (10-day for labile C) and long-term (1.5 year for temperature and N) incubations of samples collected from burned and unburned sites in the Anaktuvuk river burn on the North Slope of Alaska from different depths (organic horizon, mineral horizon and upper permafrost). The fire in this region resulted in the loss of several cms of the organic horizon and also increased active layer depth allowing the impacts of four years of thaw on deeper soil layers to be investigated. Respiration rates did not decline substantially during the long-term incubation, although decomposition rates per unit organic matter were greater in the organic horizon. In the mineral and upper permafrost soil horizons, CO2 production was more temperature sensitive, while N addition inhibited respiration in the mineral and upper permafrost layers, especially at low temperatures. In the short-term incubations, labile C additions promoted the decomposition of soil organic matter in the mineral and upper permafrost samples, but not in the organic samples, with this effect being lost following N addition in the deeper layers. These results highlight that (i) there are substantial amounts of labile organic matter in these soils (ii), the organic matter stored in mineral and upper permafrost in the tussock tundra is less readily decomposable than in the organic horizon, but that (iii) its decomposition is more sensitive to changes in temperature and that (iv) microbial activity in deeper soil layers is limited by labile C availability rather than N. Collectively, these results indicate that in addition to the loss of C by combustion of organic matter, increasing fire frequency also has the potential to indirectly promote the release of soil C to the atmosphere in the years following the disturbance.

Abstract. Full text.

Schädel C, Bader MK-F, Schuur EAG, Biasi C, Bracho R, Čapek P, De Baets S, Diáková K, Ernakovich J, Estop-Aragones C, et al (2016). Potential carbon emissions dominated by carbon dioxide from thawed permafrost soils. Nature Climate Change, 6(10), 950-953. Full text.

Auffret MD, Karhu K, Khachane A, Dungait JAJ, Fraser F, Hopkins DW, Wookey PA, Singh BK, Freitag TE, Hartley IP, et al (2016). The Role of Microbial Community Composition in Controlling Soil Respiration Responses to Temperature. PLoS One, 11(10). Abstract. Author URL. Full text.

Fisher JP, Estop-Aragonés C, Thierry A, Charman DJ, Wolfe SA, Hartley IP, Murton JB, Williams M, Phoenix GK (2016). The influence of vegetation and soil characteristics on active-layer thickness of permafrost soils in boreal forest. Glob Chang Biol, 22(9), 3127-3140.

Carbon release from thawing permafrost soils could significantly exacerbate global warming as the active-layer deepens, exposing more carbon to decay. Plant community and soil properties provide a major control on this by influencing the maximum depth of thaw each summer (active-layer thickness; ALT), but a quantitative understanding of the relative importance of plant and soil characteristics, and their interactions in determine ALTs, is currently lacking. To address this, we undertook an extensive survey of multiple vegetation and edaphic characteristics and ALTs across multiple plots in four field sites within boreal forest in the discontinuous permafrost zone (NWT, Canada). Our sites included mature black spruce, burned black spruce and paper birch, allowing us to determine vegetation and edaphic drivers that emerge as the most important and broadly applicable across these key vegetation and disturbance gradients, as well as providing insight into site-specific differences. Across sites, the most important vegetation characteristics limiting thaw (shallower ALTs) were tree leaf area index (LAI), moss layer thickness and understory LAI in that order. Thicker soil organic layers also reduced ALTs, though were less influential than moss thickness. Surface moisture (0-6 cm) promoted increased ALTs, whereas deeper soil moisture (11-16 cm) acted to modify the impact of the vegetation, in particular increasing the importance of understory or tree canopy shading in reducing thaw. These direct and indirect effects of moisture indicate that future changes in precipitation and evapotranspiration may have large influences on ALTs. Our work also suggests that forest fires cause greater ALTs by simultaneously decreasing multiple ecosystem characteristics which otherwise protect permafrost. Given that vegetation and edaphic characteristics have such clear and large influences on ALTs, our data provide a key benchmark against which to evaluate process models used to predict future impacts of climate warming on permafrost degradation and subsequent feedback to climate.

Abstract. Author URL. Full text.

Laudicina VA, Benhua S, Dennis PG, Badalucco L, Rushton SP, Newsham KK, O’Donnell AG, Hartley IP, Hopkins DW (2015). Responses to increases in temperature of heterotrophic micro-organisms in soils from the maritime Antarctic. Polar Biology, 38(8), 1153-1160. Abstract.

Hartley IP (2014). Soil carbon: Resisting climate change. Nature Climate Change, 4(9), 760-761.

Fraser FC, Hallett PD, Wookey PA, Hartley IP, Hopkins DW (2013). How do enzymes catalysing soil nitrogen transformations respond to changing temperatures?. Biology and Fertility of Soils, 49(1), 99-103. Abstract.

Hartley IP, Garnett MH, Sommerkorn M, Hopkins DW, Wookey PA (2013). The age of CO<inf>2</inf> released from soils in contrasting ecosystems during the arctic winter. Soil Biology and Biochemistry, 63, 1-4. Abstract. Full text.

Burke EJ, Hartley I, Jones CD (2012). Uncertainties in the global temperature change caused by carbon release from permafrost thawing. The Cryosphere, 6, 1063-1076.

Garnett MH, Hartley IP (2010). A passive sampling method for radiocarbon analysis of atmospheric CO<inf>2</inf> using molecular sieve. Atmospheric Environment, 44(7), 877-883. Abstract.

Hartley IP, Hopkins DW, Sommerkorn M, Wookey PA (2010). The response of organic matter mineralisation to nutrient and substrate additions in sub-arctic soils. Soil Biology and Biochemistry, 42(1), 92-100. Abstract. Full text.

Garnett MH, Hartley IP, Hopkins DW, Sommerkorn M, Wookey PA (2009). A passive sampling method for radiocarbon analysis of soil respiration using molecular sieve. Soil Biology and Biochemistry, 41(7), 1450-1456. Abstract.

Wookey PA, Aerts R, Bardgett RD, Baptist F, Bråthen K, Cornelissen JHC, Gough L, Hartley IP, Hopkins DW, Lavorel S, et al (2009). Ecosystem feedbacks and cascade processes: Understanding their role in the responses of Arctic and alpine ecosystems to environmental change. Global Change Biology, 15(5), 1153-1172.

Global environmental change, related to climate change and the deposition of airborne N-containing contaminants, has already resulted in shifts in plant community composition among plant functional types in Arctic and temperate alpine regions. In this paper, we review how key ecosystem processes will be altered by these transformations, the complex biological cascades and feedbacks that might result, and some of the potential broader consequences for the earth system. Firstly, we consider how patterns of growth and allocation, and nutrient uptake, will be altered by the shifts in plant dominance. The ways in which these changes may disproportionately affect the consumer communities, and rates of decomposition, are then discussed. We show that the occurrence of a broad spectrum of plant growth forms in these regions (from cryptogams to deciduous and evergreen dwarf shrubs, graminoids and forbs), together with hypothesized low functional redundancy, will mean that shifts in plant dominance result in a complex series of biotic cascades, couplings and feedbacks which are supplemental to the direct responses of ecosystem components to the primary global change drivers. The nature of these complex interactions is highlighted using the example of the climate-driven increase in shrub cover in low-Arctic tundra, and the contrasting transformations in plant functional composition in mid-latitude alpine systems. Finally, the potential effects of the transformations on ecosystem properties and processes that link with the earth system are reviewed. We conclude that the effects of global change on these ecosystems, and potential climate-change feedbacks, cannot be predicted from simple empirical relationships between processes and driving variables. Rather, the effects of changes in species distributions and dominances on key ecosystem processes and properties must also be considered, based upon best estimates of the trajectories of key transformations, their magnitude and rates of change. © Journal compilation © 2009 Blackwell Publishing.

Abstract.

Hartley IP, Hopkins DW, Garnett MH, Sommerkorn M, Wookey PA (2009). No evidence for compensatory thermal adaptation of soil microbial respiration in the study of Bradford et al. (2008). Ecol Lett, 12(7), E12-E14. Abstract. Author URL.

Hartley I (2008). Arctic soils face the big thaw. Planet Earth(AUTUMN). Abstract.

Zaragoza-Castells J, Sánchez-Gómez D, Hartley IP, Matesanz S, Valladares F, Lloyd J, Atkin OK (2008). Climate-dependent variations in leaf respiration in a dry-land, low productivity Mediterranean forest: the importance of acclimation in both high-light and shaded habitats. Functional Ecology, 22(1), 172-184. Abstract.

Hawkes CV, Hartley IP, Ineson P, Fitter AH (2008). Soil temperature affects carbon allocation within arbuscular mycorrhizal networks and carbon transport from plant to fungus. Global Change Biology, 14(5), 1181-1190. Abstract.

Hartley IP, Ineson P (2008). Substrate quality and the temperature sensitivity of soil organic matter decomposition. Soil Biology and Biochemistry, 40(7), 1567-1574. Abstract. Full text.

Hartley IP, Heinemeyer A, Ineson P (2007). Effects of three years of soil warming and shading on the rate of soil respiration: Substrate availability and not thermal acclimation mediates observed response. Global Change Biology, 13(8), 1761-1770. Abstract.

Abstract.

Hartley IP, Heinemeyer A, Evans SP, Ineson P (2007). The effect of soil warming on bulk soil vs. rhizosphere respiration. Global Change Biology, 13(12), 2654-2667. Abstract.

Hartley IP, Armstrong AF, Murthy R, Barron-Gafford G, Ineson P, Atkin OK (2006). The dependence of respiration on photosynthetic substrate supply and temperature: Integrating leaf, soil and ecosystem measurements. Global Change Biology, 12(10), 1954-1968.

Interactions between photosynthetic substrate supply and temperature in determining the rate of three respiration components (leaf, belowground and ecosystem respiration) were investigated within three environmentally controlled, Populus deltoides forest bays at Biosphere 2, Arizona. Over 2 months, the atmospheric CO2 concentration and air temperature were manipulated to test the following hypotheses: (1) the responses of the three respiration components to changes in the rate of photosynthesis would differ both in speed and magnitude; (2) the temperature sensitivity of leaf and belowground respiration would increase in response to a rise in substrate availability; and, (3) at the ecosystem level, the ratio of respiration to photosynthesis would be conserved despite week-to-week changes in temperature. All three respiration rates responded to the CO2 concentration-induced changes in photosynthesis. However, the proportional change in the rate of leaf respiration was more than twice that of belowground respiration and, when photosynthesis was reduced, was also more rapid. The results suggest that aboveground respiration plays a key role in the overall response of ecosystem respiration to short-term changes in canopy photosynthesis. The short-term temperature sensitivity of leaf respiration, measured within a single night, was found to be affected more by developmental conditions than photosynthetic substrate availability, as the Q10 was lower in leaves that developed at high CO2, irrespective of substrate availability. However, the temperature sensitivity of belowground respiration, calculated between periods of differing air temperature, appeared to be positively correlated with photosynthetic substrate availability. At the ecosystem level, respiration and photosynthesis were positively correlated but the relationship was affected by temperature; for a given rate of daytime photosynthesis, the rate of respiration the following night was greater at 25 than 20°C. This result suggests that net ecosystem exchange did not acclimate to temperature changes lasting up to 3 weeks. Overall, the results of this study demonstrate that the three respiration terms differ in their dependence on photosynthesis and that, short- and medium-term changes in temperature may affect net carbon storage in terrestrial ecosystems. © 2006 Blackwell Publishing Ltd.

Abstract.

Chapters

Hartley IP, Singh BK (2018). Impact of global changes on soil C storage-possible mechanisms and modeling approaches. In (Ed) Soil Carbon Storage: Modulators, Mechanisms and Modeling, 245-279. Abstract.

Publications by year

In Press

2020

2019

Gatis NL, Benaud P, Ashe J, Luscombe D, Grand-Clement E, Hartley I, Anderson K, Brazier R (2019). Assessing the impact of peat erosion on growing season CO2 fluxes by comparing erosional peat pans and surrounding vegetated haggs (dataset). Full text.

Figueiredo Lugli L (2019). Dynamics and biological interactions of phosphorus cycling in central Amazonian forests.

Soil nutrient availability is considered to constrain the productivity of terrestrial ecosystems, with phosphorus (P) considered to be the most limiting nutrient in tropical forests. Due the great importance of Amazon forests in carbon (C) cycling and the fact that the majority of Amazon forests grow in low-fertility soils, understanding how nutrient limitation may affect net primary productivity (NPP) in these ecosystems is crucial to predict C storage in response to future climate. The direct effects of nutrient limitation on above and belowground forest functioning can only be tested through experimentation and up to now, the few large scale fertilisation experiments installed in lowland tropical forests indicate that multiple nutrients may limit different aspects of tropical forests, with inconsistent evidence for P limitation. Since much less is known about the potential effects of nutrient limitation on belowground forest functioning, this research aimed to analyse the main belowground mechanisms involved in P cycling, and how roots and soil microorganisms adapt to different conditions of soil fertility in central Amazon forests. I investigated how root morphological traits, mycorrhizal colonisation as well as enzyme exudation both from roots and soil microbes were expressed in natural low-fertility soils and how these traits responded to the short-term addition of P, nitrogen (N) and cations, as part of the first large-scale soil nutrient manipulation experiment in a central Amazon lowland forest near Manaus, Brazil. I show that in natural low-fertility soils, roots display a range of adaptations to increase P-uptake efficiency and investments in root morphological and physiological adaptations as well as association with fungi symbionts are complementary towards maintaining forest productivity in a central Amazon forest. With nutrient addition, I found support for the hypothesis of P-limitation, since trees were able to rapidly adapt their root morphological traits, reduce investments in enzyme exudation and increase association with mycorrhizal fungi. Such responses were also affected by cation addition, reinforcing the idea that multiple nutrients may control the expression of root traits. The soil microbial community was also affected by the short-term addition of nutrients, with a reduction in enzyme production with the addition of phosphorus, indicating a rapid alleviation of phosphorus limitation, but this reduction was eliminated when cations were also added. My results suggest that plants and soil microorganisms can rapidly respond to changes in soil nutrient
Abstract
4
availability by changing their investments in nutrient uptake mechanisms, ultimately impacting plant productivity. These responses are crucial if we are to better understand how these forests function and how they may respond to global change.

Abstract. Full text.

Gatis N, Grand-Clement E, Luscombe DJ, Hartley IP, Anderson K, Brazier RE (2019). Growing season CO2 fluxes from a drained peatland dominated by Molinia caerulea. MIRES AND PEAT, 24 Author URL.

Abstract. Author URL. Full text.

2018

Abstract. Full text.

2017

2016

Abstract. Full text.

Abstract. Author URL. Full text.

2015

2014

Hartley IP (2014). Soil carbon: Resisting climate change. Nature Climate Change, 4(9), 760-761.

2013

2012

Burke EJ, Hartley I, Jones CD (2012). Uncertainties in the global temperature change caused by carbon release from permafrost thawing. The Cryosphere, 6, 1063-1076.

2010

Garnett MH, Hartley IP (2010). A passive sampling method for radiocarbon analysis of atmospheric CO<inf>2</inf> using molecular sieve. Atmospheric Environment, 44(7), 877-883. Abstract.

2009

Abstract.

2008

Hartley I (2008). Arctic soils face the big thaw. Planet Earth(AUTUMN). Abstract.

Hartley IP, Ineson P (2008). Substrate quality and the temperature sensitivity of soil organic matter decomposition. Soil Biology and Biochemistry, 40(7), 1567-1574. Abstract. Full text.

2007

Abstract.

Hartley IP, Heinemeyer A, Evans SP, Ineson P (2007). The effect of soil warming on bulk soil vs. rhizosphere respiration. Global Change Biology, 13(12), 2654-2667. Abstract.

2006

Abstract.

Iain_Hartley Details from cache as at 2020-09-28 19:39:08

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External Engagement and Impact

External positions

Member of the NERC Radiocarbon Facility Steering Committee

Member of the Scientific Steering Committee for AmazonFACE

Teaching

Office Hours: Term 2

Week 6: Tuesday 14:00-15:00; Wednesday 11:00-12:00

Week 7: Monday 12:00 – 13:00; Tuesday 12:00-13:00

Week 8: Monday 12:00 – 13:00; Tuesday 12:00-13:00

Week 9: Monday 12:00 – 13:00; Tuesday 12:00-13:00

PLEASE EMAIL ME TO ARRANGE A VIDEO MEETING DURING MY OFFICE HOURS

Week 10: Thursday 12:00-13:00; Thursday 16:00-17:00

Week 11: Monday 12:00 – 13:00; Tuesday 12:00-13:00

Modules

2020/21

Information not currently available

Supervision / Group

Postdoctoral researchers

Kelly Andersen
Naomi Gatis
Sophie Green

Postgraduate researchers

Laynara Figueiredo Lugli with Lina Mercado
Katie Journeaux
Sankar Mariappan with Tim Quine and Jenni Dungait
Jennifer Michel with Jeanette Whitaker
Nicole Sanderson with Dan Charman

Alumni

Anka Asandei
Mark Cooper
Cristian Estop Aragones University of Alberta
Naomi Gatis
Kristiina Karhu University of Helsinki

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Professor Iain Hartley

Professor of Terrestrial Ecosystem Science

Overview

Broad research specialisms:

Qualifications

Research group links

Research

Research interests

Research projects

Research grants

Publications

Key publications

Abstract:Quantifying landscape-level methane fluxes in subarctic Finland using a multiscale approach

Abstract:Temperature sensitivity of soil respiration rates enhanced by microbial community response.

Abstract:Soil microbial respiration in arctic soil does not acclimate to temperature.

Abstract:Substrate quality and the temperature sensitivity of soil organic matter decomposition

Abstract:Forest soil CO2 flux: Uncovering the contribution and environmental responses of ectomycorrhizas

Publications by category

Journal articles

Abstract:Rhizosphere allocation by canopy-forming species dominates soil CO2 efflux in a subarctic landscape.

Abstract:Silicon accumulation controls carbon cycle in wetlands through modifying nutrients stoichiometry and lignin synthesis of Phragmites australis

Abstract:ASSESSING THE IMPACT OF PEAT EROSION ON GROWING SEASON CO2 FLUXES BY COMPARING EROSIONAL PEAT PANS AND SURROUNDING VEGETATED HAGGS

Abstract:Long-term nitrogen addition modifies microbial composition and functions for slow carbon cycling and increased sequestration in tropical forest soil.

Abstract:Soil functions and ecosystem services research in the Chinese karst Critical Zone

Abstract:Drying and rewetting conditions differentially affect the mineralization of fresh plant litter and extant soil organic matter

Abstract:Limited release of previously-frozen C and increased new peat formation after thaw in permafrost peatlands

Abstract:Ecosystem service delivery in Karst landscapes: anthropogenic perturbation and recovery

Abstract:Investigating the controls on soil organic matter decomposition in tussock tundra soil and permafrost after fire

Abstract:The Role of Microbial Community Composition in Controlling Soil Respiration Responses to Temperature.

Abstract:The influence of vegetation and soil characteristics on active-layer thickness of permafrost soils in boreal forest.

Abstract:Quantifying landscape-level methane fluxes in subarctic Finland using a multiscale approach

Abstract:Responses to increases in temperature of heterotrophic micro-organisms in soils from the maritime Antarctic

Abstract:Temperature sensitivity of soil respiration rates enhanced by microbial community response.

Abstract:How do enzymes catalysing soil nitrogen transformations respond to changing temperatures?

Abstract:The age of CO2 released from soils in contrasting ecosystems during the arctic winter

Abstract:A passive sampling method for radiocarbon analysis of atmospheric CO2 using molecular sieve

Abstract:The response of organic matter mineralisation to nutrient and substrate additions in sub-arctic soils

Abstract:A passive sampling method for radiocarbon analysis of soil respiration using molecular sieve

Abstract:Ecosystem feedbacks and cascade processes: Understanding their role in the responses of Arctic and alpine ecosystems to environmental change

Abstract:No evidence for compensatory thermal adaptation of soil microbial respiration in the study of Bradford et al. (2008).

Abstract:Arctic soils face the big thaw

Abstract:Climate-dependent variations in leaf respiration in a dry-land, low productivity Mediterranean forest: the importance of acclimation in both high-light and shaded habitats

Abstract:Soil microbial respiration in arctic soil does not acclimate to temperature.

Abstract:Soil temperature affects carbon allocation within arbuscular mycorrhizal networks and carbon transport from plant to fungus

Abstract:Substrate quality and the temperature sensitivity of soil organic matter decomposition

Abstract:Effects of three years of soil warming and shading on the rate of soil respiration: Substrate availability and not thermal acclimation mediates observed response

Abstract:Forest soil CO2 flux: Uncovering the contribution and environmental responses of ectomycorrhizas

Abstract:The effect of soil warming on bulk soil vs. rhizosphere respiration

Abstract:The dependence of respiration on photosynthetic substrate supply and temperature: Integrating leaf, soil and ecosystem measurements

Chapters

Abstract:Impact of global changes on soil C storage-possible mechanisms and modeling approaches

Publications by year

In Press

2020

Abstract:Rhizosphere allocation by canopy-forming species dominates soil CO2 efflux in a subarctic landscape.

Abstract:Silicon accumulation controls carbon cycle in wetlands through modifying nutrients stoichiometry and lignin synthesis of Phragmites australis

2019

Abstract:ASSESSING THE IMPACT OF PEAT EROSION ON GROWING SEASON CO2 FLUXES BY COMPARING EROSIONAL PEAT PANS AND SURROUNDING VEGETATED HAGGS

Abstract:Dynamics and biological interactions of phosphorus cycling in central Amazonian forests

Abstract:Long-term nitrogen addition modifies microbial composition and functions for slow carbon cycling and increased sequestration in tropical forest soil.

Abstract:Soil functions and ecosystem services research in the Chinese karst Critical Zone

2018

Abstract:Drying and rewetting conditions differentially affect the mineralization of fresh plant litter and extant soil organic matter

Abstract:Impact of global changes on soil C storage-possible mechanisms and modeling approaches

Abstract:Limited release of previously-frozen C and increased new peat formation after thaw in permafrost peatlands

2017

Abstract:Ecosystem service delivery in Karst landscapes: anthropogenic perturbation and recovery

2016

Abstract:Investigating the controls on soil organic matter decomposition in tussock tundra soil and permafrost after fire

Abstract:The Role of Microbial Community Composition in Controlling Soil Respiration Responses to Temperature.

Abstract:The influence of vegetation and soil characteristics on active-layer thickness of permafrost soils in boreal forest.

2015

Abstract:Quantifying landscape-level methane fluxes in subarctic Finland using a multiscale approach

Abstract:Responses to increases in temperature of heterotrophic micro-organisms in soils from the maritime Antarctic

2014

Abstract:Temperature sensitivity of soil respiration rates enhanced by microbial community response.

2013

Abstract:How do enzymes catalysing soil nitrogen transformations respond to changing temperatures?

Abstract:The age of CO2 released from soils in contrasting ecosystems during the arctic winter

2012

Abstract:
Quantifying landscape-level methane fluxes in subarctic Finland using a multiscale approach

Abstract:
Temperature sensitivity of soil respiration rates enhanced by microbial community response.

Abstract:
Soil microbial respiration in arctic soil does not acclimate to temperature.

Abstract:
Substrate quality and the temperature sensitivity of soil organic matter decomposition

Abstract:
Forest soil CO2 flux: Uncovering the contribution and environmental responses of ectomycorrhizas

Abstract:
Rhizosphere allocation by canopy-forming species dominates soil CO2 efflux in a subarctic landscape.

Abstract:
Silicon accumulation controls carbon cycle in wetlands through modifying nutrients stoichiometry and lignin synthesis of Phragmites australis

Abstract:
ASSESSING THE IMPACT OF PEAT EROSION ON GROWING SEASON CO2 FLUXES BY COMPARING EROSIONAL PEAT PANS AND SURROUNDING VEGETATED HAGGS

Abstract:
Long-term nitrogen addition modifies microbial composition and functions for slow carbon cycling and increased sequestration in tropical forest soil.

Abstract:
Soil functions and ecosystem services research in the Chinese karst Critical Zone

Abstract:
Drying and rewetting conditions differentially affect the mineralization of fresh plant litter and extant soil organic matter

Abstract:
Limited release of previously-frozen C and increased new peat formation after thaw in permafrost peatlands

Abstract:
Ecosystem service delivery in Karst landscapes: anthropogenic perturbation and recovery

Abstract:
Investigating the controls on soil organic matter decomposition in tussock tundra soil and permafrost after fire

Abstract:
The Role of Microbial Community Composition in Controlling Soil Respiration Responses to Temperature.

Abstract:
The influence of vegetation and soil characteristics on active-layer thickness of permafrost soils in boreal forest.

Abstract:
Quantifying landscape-level methane fluxes in subarctic Finland using a multiscale approach

Abstract:
Responses to increases in temperature of heterotrophic micro-organisms in soils from the maritime Antarctic

Abstract:
Temperature sensitivity of soil respiration rates enhanced by microbial community response.

Abstract:
How do enzymes catalysing soil nitrogen transformations respond to changing temperatures?

Abstract:
The age of CO2 released from soils in contrasting ecosystems during the arctic winter

Abstract:
A passive sampling method for radiocarbon analysis of atmospheric CO2 using molecular sieve

Abstract:
The response of organic matter mineralisation to nutrient and substrate additions in sub-arctic soils

Abstract:
A passive sampling method for radiocarbon analysis of soil respiration using molecular sieve

Abstract:
Ecosystem feedbacks and cascade processes: Understanding their role in the responses of Arctic and alpine ecosystems to environmental change

Abstract:
No evidence for compensatory thermal adaptation of soil microbial respiration in the study of Bradford et al. (2008).

Abstract:
Arctic soils face the big thaw

Abstract:
Climate-dependent variations in leaf respiration in a dry-land, low productivity Mediterranean forest: the importance of acclimation in both high-light and shaded habitats

Abstract:
Soil microbial respiration in arctic soil does not acclimate to temperature.

Abstract:
Soil temperature affects carbon allocation within arbuscular mycorrhizal networks and carbon transport from plant to fungus

Abstract:
Substrate quality and the temperature sensitivity of soil organic matter decomposition

Abstract:
Effects of three years of soil warming and shading on the rate of soil respiration: Substrate availability and not thermal acclimation mediates observed response

Abstract:
Forest soil CO2 flux: Uncovering the contribution and environmental responses of ectomycorrhizas

Abstract:
The effect of soil warming on bulk soil vs. rhizosphere respiration

Abstract:
The dependence of respiration on photosynthetic substrate supply and temperature: Integrating leaf, soil and ecosystem measurements

Abstract:
Impact of global changes on soil C storage-possible mechanisms and modeling approaches

Abstract:
Rhizosphere allocation by canopy-forming species dominates soil CO2 efflux in a subarctic landscape.

Abstract:
Silicon accumulation controls carbon cycle in wetlands through modifying nutrients stoichiometry and lignin synthesis of Phragmites australis

Abstract:
ASSESSING THE IMPACT OF PEAT EROSION ON GROWING SEASON CO2 FLUXES BY COMPARING EROSIONAL PEAT PANS AND SURROUNDING VEGETATED HAGGS

Abstract:
Dynamics and biological interactions of phosphorus cycling in central Amazonian forests

Abstract:
Long-term nitrogen addition modifies microbial composition and functions for slow carbon cycling and increased sequestration in tropical forest soil.

Abstract:
Soil functions and ecosystem services research in the Chinese karst Critical Zone

Abstract:
Drying and rewetting conditions differentially affect the mineralization of fresh plant litter and extant soil organic matter

Abstract:
Impact of global changes on soil C storage-possible mechanisms and modeling approaches

Abstract:
Limited release of previously-frozen C and increased new peat formation after thaw in permafrost peatlands

Abstract:
Ecosystem service delivery in Karst landscapes: anthropogenic perturbation and recovery

Abstract:
Investigating the controls on soil organic matter decomposition in tussock tundra soil and permafrost after fire

Abstract:
The Role of Microbial Community Composition in Controlling Soil Respiration Responses to Temperature.

Abstract:
The influence of vegetation and soil characteristics on active-layer thickness of permafrost soils in boreal forest.

Abstract:
Quantifying landscape-level methane fluxes in subarctic Finland using a multiscale approach

Abstract:
Responses to increases in temperature of heterotrophic micro-organisms in soils from the maritime Antarctic

Abstract:
Temperature sensitivity of soil respiration rates enhanced by microbial community response.

Abstract:
How do enzymes catalysing soil nitrogen transformations respond to changing temperatures?

Abstract:
The age of CO2 released from soils in contrasting ecosystems during the arctic winter

Abstract:
A passive sampling method for radiocarbon analysis of atmospheric CO2 using molecular sieve

Abstract:
The response of organic matter mineralisation to nutrient and substrate additions in sub-arctic soils

Abstract:
A passive sampling method for radiocarbon analysis of soil respiration using molecular sieve

Abstract:
Ecosystem feedbacks and cascade processes: Understanding their role in the responses of Arctic and alpine ecosystems to environmental change

Abstract:
No evidence for compensatory thermal adaptation of soil microbial respiration in the study of Bradford et al. (2008).

Abstract:
Arctic soils face the big thaw

Abstract:
Climate-dependent variations in leaf respiration in a dry-land, low productivity Mediterranean forest: the importance of acclimation in both high-light and shaded habitats

Abstract:
Soil microbial respiration in arctic soil does not acclimate to temperature.

Abstract:
Soil temperature affects carbon allocation within arbuscular mycorrhizal networks and carbon transport from plant to fungus

Abstract:
Substrate quality and the temperature sensitivity of soil organic matter decomposition

Abstract:
Effects of three years of soil warming and shading on the rate of soil respiration: Substrate availability and not thermal acclimation mediates observed response

Abstract:
Forest soil CO2 flux: Uncovering the contribution and environmental responses of ectomycorrhizas

Abstract:
The effect of soil warming on bulk soil vs. rhizosphere respiration

Abstract:
The dependence of respiration on photosynthetic substrate supply and temperature: Integrating leaf, soil and ecosystem measurements