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Temperature and peat type control CO2 and CH4 production in Alaskan permafrost peats.
Glob Chang Biol 2014; 20(8):2674-86GC

Abstract

Controls on the fate of ~277 Pg of soil organic carbon (C) stored in permafrost peatland soils remain poorly understood despite the potential for a significant positive feedback to climate change. Our objective was to quantify the temperature, moisture, organic matter, and microbial controls on soil organic carbon (SOC) losses following permafrost thaw in peat soils across Alaska. We compared the carbon dioxide (CO2) and methane (CH4) emissions from peat samples collected at active layer and permafrost depths when incubated aerobically and anaerobically at -5, -0.5, +4, and +20 °C. Temperature had a strong, positive effect on C emissions; global warming potential (GWP) was >3× larger at 20 °C than at 4 °C. Anaerobic conditions significantly reduced CO2 emissions and GWP by 47% at 20 °C but did not have a significant effect at -0.5 °C. Net anaerobic CH4 production over 30 days was 7.1 ± 2.8 μg CH4 -C gC(-1) at 20 °C. Cumulative CO2 emissions were related to organic matter chemistry and best predicted by the relative abundance of polysaccharides and proteins (R(2) = 0.81) in SOC. Carbon emissions (CO2 -C + CH4 -C) from the active layer depth peat ranged from 77% larger to not significantly different than permafrost depths and varied depending on the peat type and peat decomposition stage rather than thermal state. Potential SOC losses with warming depend not only on the magnitude of temperature increase and hydrology but also organic matter quality, permafrost history, and vegetation dynamics, which will ultimately determine net radiative forcing due to permafrost thaw.

Authors+Show Affiliations

Earth Systems Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

24616169

Citation

Treat, C C., et al. "Temperature and Peat Type Control CO2 and CH4 Production in Alaskan Permafrost Peats." Global Change Biology, vol. 20, no. 8, 2014, pp. 2674-86.
Treat CC, Wollheim WM, Varner RK, et al. Temperature and peat type control CO2 and CH4 production in Alaskan permafrost peats. Glob Chang Biol. 2014;20(8):2674-86.
Treat, C. C., Wollheim, W. M., Varner, R. K., Grandy, A. S., Talbot, J., & Frolking, S. (2014). Temperature and peat type control CO2 and CH4 production in Alaskan permafrost peats. Global Change Biology, 20(8), pp. 2674-86. doi:10.1111/gcb.12572.
Treat CC, et al. Temperature and Peat Type Control CO2 and CH4 Production in Alaskan Permafrost Peats. Glob Chang Biol. 2014;20(8):2674-86. PubMed PMID: 24616169.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Temperature and peat type control CO2 and CH4 production in Alaskan permafrost peats. AU - Treat,C C, AU - Wollheim,W M, AU - Varner,R K, AU - Grandy,A S, AU - Talbot,J, AU - Frolking,S, Y1 - 2014/04/26/ PY - 2013/11/12/received PY - 2014/02/28/accepted PY - 2014/3/12/entrez PY - 2014/3/13/pubmed PY - 2015/2/20/medline KW - Arctic KW - Peatland KW - boreal KW - carbon KW - climate change KW - methane KW - permafrost thaw SP - 2674 EP - 86 JF - Global change biology JO - Glob Chang Biol VL - 20 IS - 8 N2 - Controls on the fate of ~277 Pg of soil organic carbon (C) stored in permafrost peatland soils remain poorly understood despite the potential for a significant positive feedback to climate change. Our objective was to quantify the temperature, moisture, organic matter, and microbial controls on soil organic carbon (SOC) losses following permafrost thaw in peat soils across Alaska. We compared the carbon dioxide (CO2) and methane (CH4) emissions from peat samples collected at active layer and permafrost depths when incubated aerobically and anaerobically at -5, -0.5, +4, and +20 °C. Temperature had a strong, positive effect on C emissions; global warming potential (GWP) was >3× larger at 20 °C than at 4 °C. Anaerobic conditions significantly reduced CO2 emissions and GWP by 47% at 20 °C but did not have a significant effect at -0.5 °C. Net anaerobic CH4 production over 30 days was 7.1 ± 2.8 μg CH4 -C gC(-1) at 20 °C. Cumulative CO2 emissions were related to organic matter chemistry and best predicted by the relative abundance of polysaccharides and proteins (R(2) = 0.81) in SOC. Carbon emissions (CO2 -C + CH4 -C) from the active layer depth peat ranged from 77% larger to not significantly different than permafrost depths and varied depending on the peat type and peat decomposition stage rather than thermal state. Potential SOC losses with warming depend not only on the magnitude of temperature increase and hydrology but also organic matter quality, permafrost history, and vegetation dynamics, which will ultimately determine net radiative forcing due to permafrost thaw. SN - 1365-2486 UR - https://www.unboundmedicine.com/medline/citation/24616169/Temperature_and_peat_type_control_CO2_and_CH4_production_in_Alaskan_permafrost_peats_ L2 - https://doi.org/10.1111/gcb.12572 DB - PRIME DP - Unbound Medicine ER -