期刊
NATURE CLIMATE CHANGE
卷 5, 期 6, 页码 588-595出版社
NATURE PORTFOLIO
DOI: 10.1038/nclimate2580
关键词
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资金
- Lawrence Scholar Fellowship awarded through Lawrence Livermore National Laboratory (LLNL)
- Institute of Soil Landscape Research, Leibniz-Center for Agricultural Landscape Research (ZALF), Muncheberg,Germany [2014-1918]
- US Department of Energy by LLNL [DE-AC52-07NA27344]
- LLNL LDRD 'Microbes and Minerals: Imaging C Stabilization'
- US DOE Genomics Science program award [SA-DOE-29318]
- LBNL from LLNL [IC006762]
- DOE-BER Sustainable Systems SFA
- Office of Science, Office of Basic Energy Sciences, of the US DOE [DE-AC02-05CH11231]
Multiple lines of existing evidence suggest that climate change enhances root exudation of organic compounds into soils. Recent experimental studies show that increased exudate inputs may cause a net loss of soil carbon. This stimulation of microbial carbon mineralization ('priming') is commonly rationalized by the assumption that exudates provide a readily bioavailable supply of energy for the decomposition of native soil carbon (co-metabolism). Here we show that an alternate mechanism can cause carbon loss of equal or greater magnitude. We find that a common root exudate, oxalic acid, promotes carbon loss by liberating organic compounds from protective associations with minerals. By enhancing microbial access to previously mineral-protected compounds, this indirect mechanism accelerated carbon loss more than simply increasing the supply of energetically more favourable substrates. Our results provide insights into the coupled biotic-abiotic mechanisms underlying the 'priming' phenomenon and challenge the assumption that mineral-associated carbon is protected from microbial cycling over millennial timescales.
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