globalchange  > 气候变化与战略
DOI: 10.1111/gcb.14517
Scopus ID: 2-s2.0-85058385738
Reduced carbon use efficiency and increased microbial turnover with soil warming
Author: Li J.; Wang G.; Mayes M.A.; Allison S.D.; Frey S.D.; Shi Z.; Hu X.-M.; Luo Y.; Melillo J.M.
Source Publication: Global Change Biology
ISSN: 13541013
Publishing Year: 2019
Volume: 25, Issue:3
pages begin: 900
pages end: 910
Language: 英语
Keyword: carbon use efficiency (CUE) ; data-model integration ; Harvard forest ; microbial biomass turnover (rB) ; soil warming ; temperature sensitivity
English Abstract: Global soil carbon (C) stocks are expected to decline with warming, and changes in microbial processes are key to this projection. However, warming responses of critical microbial parameters such as carbon use efficiency (CUE) and biomass turnover (rB) are not well understood. Here, we determine these parameters using a probabilistic inversion approach that integrates a microbial-enzyme model with 22 years of carbon cycling measurements at Harvard Forest. We find that increasing temperature reduces CUE but increases rB, and that two decades of soil warming increases the temperature sensitivities of CUE and rB. These temperature sensitivities, which are derived from decades-long field observations, contrast with values obtained from short-term laboratory experiments. We also show that long-term soil C flux and pool changes in response to warming are more dependent on the temperature sensitivity of CUE than that of rB. Using the inversion-derived parameters, we project that chronic soil warming at Harvard Forest over six decades will result in soil C gain of <1.0% on average (1st and 3rd quartiles: 3.0% loss and 10.5% gain) in the surface mineral horizon. Our results demonstrate that estimates of temperature sensitivity of microbial CUE and rB can be obtained and evaluated rigorously by integrating multidecadal datasets. This approach can potentially be applied in broader spatiotemporal scales to improve long-term projections of soil C feedbacks to climate warming. © 2018 John Wiley & Sons Ltd
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Document Type: 期刊论文
Appears in Collections:气候变化与战略

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Li J.,Wang G.,Mayes M.A.,et al. Reduced carbon use efficiency and increased microbial turnover with soil warming[J]. Global Change Biology,2019-01-01,25(3)
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