期刊
ECOLOGY LETTERS
卷 21, 期 11, 页码 1639-1648出版社
WILEY
DOI: 10.1111/ele.13140
关键词
Bacteria; carbon; climate change; elevated CO2; microbial C use; microbial communities; microbial function; soil; warming
类别
资金
- National Science Foundation [1021559 DEB]
- USDA-CSREES Soil Processes Program [2008-35107-18655]
- US Department of Energy's Office of Science (BER) through the Terrestrial Ecosystem Science program
Accurate predictions of soil C feedbacks to climate change depend on an improved understanding of responses of soil C pools and C use by soil microbial groups. We assessed soil and microbial C in a 7-year manipulation of CO2 and warming in a semi-arid grassland. Continuous field isotopic labelling under elevated CO2 further allowed us to study the dynamics of the existing C (Old C) in soil and microbes as affected by warming. Warming reduced soil C under elevated CO2 but had no impact under ambient CO2. Loss of soil C under warming and elevated CO2 was attributed to increased proportional loss of Old C. Warming also reduced the proportion of Old C in microbes, specifically the bacteria, but not the fungi. These findings highlight that warming impacts are C pool and microbial taxa dependent and demonstrate interactive effects of warming and atmospheric CO2 on soil C.
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