Radiocarbon Analyses Quantify Peat Carbon Losses With Increasing Temperature in a Whole Ecosystem Warming Experiment
Radiocarbon Analyses Quantify Peat Carbon Losses With Increasing Temperature in a Whole Ecosystem Warming Experiment
复制标题
放射性碳分析量化了整个生态系统变暖实验中随着温度升高而造成的泥炭碳损失
DOI:
10.1029/2021jg006511
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Kolka, Randall K.
中科院分区:
文献类型:
--
作者:
Wilson, Rachel M.;Griffiths, Natalie A.;Visser, Ate;McFarlane, Karis J.;Sebestyen, Stephen D.;Oleheiser, Keith C.;Bosman, Samantha;Hopple, Anya M.;Tfaily, Malak M.;Kolka, Randall K.
Climate warming is expected to accelerate peatland degradation and release rates of carbon dioxide (CO2) and methane (CH4). Spruce and Peatlands Responses Under Changing Environments is an ecosystem‐scale climate manipulation experiment, designed to examine peatland ecosystem response to climate forcings. We examined whether heating up to +9 °C to 3 m‐deep in a peat bog over a 7‐year period led to higher C turnover and CO2and CH4emissions, by measuring14C of solid peat, dissolved organic carbon (DOC), CH4, and dissolved CO2(DIC). DOC, a major substrate for heterotrophic respiration, increased significantly with warming. There was no 7‐year trend in the DI14C of the ambient plots which remained similar to their DO14C. At +6.75 °C and +9 °C, the14C of DIC, a product of microbial respiration, initially resembled ambient plots but became more depleted over 7 years of warming. We attributed the shifts in DI14C to the increasing importance of solid phase peat as a substrate for microbial respiration and quantified this shift via the radiocarbon mass balance. The mass‐balance model revealed increases in peat‐supported respiration of the catotelm depths in heated plots over time and relative to ambient enclosures, from a baseline of 20%–25% in ambient enclosures, to 35%–40% in the heated plots. We find that warming stimulates microorganisms to respire ancient peat C, deposited under prior climate (cooler) conditions. This apparent destabilization of the large peat C reservoir has implications for peatland‐climate feedbacks especially if the balance of the peatland is tipped from net C sink to C source.
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DOI:
10.1098/rsta.2005.1671
发表时间:
2005-12-15
影响因子:
5
作者:
Holden, J
通讯作者:
Holden, J
影响因子:
3
作者:
R. Wilson;M. Tfaily;V. Rich;J. Keller;S. Bridgham;C. Zalman;L. Meredith;P. Hanson;M. Hines;Laurel E. Pfeifer‐Meister;S. Saleska;P. Crill;W. Cooper;J. Chanton;J. Kostka
通讯作者:
R. Wilson;M. Tfaily;V. Rich;J. Keller;S. Bridgham;C. Zalman;L. Meredith;P. Hanson;M. Hines;Laurel E. Pfeifer‐Meister;S. Saleska;P. Crill;W. Cooper;J. Chanton;J. Kostka
影响因子:
6.7
作者:
M. McPartland;R. Montgomery;P. Hanson;J. Phillips;R. Kolka;B. Palik
通讯作者:
B. Palik
影响因子:
5.2
作者:
Chanton, J. P.;Glaser, P. H.;Cooper, W. T.
通讯作者:
Cooper, W. T.
影响因子:
11.4
作者:
Chen, Jiquan;Bridgham, Scott;Weltzin, Jake F.
通讯作者:
Weltzin, Jake F.