全球智库信息集成服务系统(G2TT): Microbial temperature sensitivity and biomass change explain soil carbon loss with warming.

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来源类型	Article
规范类型	其他
DOI	10.1038/s41558-018-0259-x
	Microbial temperature sensitivity and biomass change explain soil carbon loss with warming.
	Walker T; Kaiser C; Strasser F; Herbold C; Leblans N; Woebken D; Janssens I; Sigurdsson B
发表日期	2018
出处	Nature Climate Change 8 (9): 885-889
出版年	2018
语种	英语
摘要	Soil microorganisms control carbon losses from soils to the atmosphere, yet their responses to climate warming are often short-lived and unpredictable. Two mechanisms, microbial acclimation and substrate depletion, have been proposed to explain temporary warming effects on soil microbial activity. However, empirical support for either mechanism is unconvincing. Here we used geothermal temperature gradients (>50 years of field warming) and a short-term experiment to show that microbial activity (gross rates of growth, turnover, respiration and carbon uptake) is intrinsically temperature sensitive and does not acclimate to warming (+6 °C) over weeks or decades. Permanently accelerated microbial activity caused carbon loss from soil. However, soil carbon loss was temporary because substrate depletion reduced microbial biomass and constrained the influence of microbes over the ecosystem. A microbial biogeochemical model showed that these observations are reproducible through a modest, but permanent, acceleration in microbial physiology. These findings reveal a mechanism by which intrinsic microbial temperature sensitivity and substrate depletion together dictate warming effects on soil carbon loss via their control over microbial biomass. We thus provide a framework for interpreting the links between temperature, microbial activity and soil carbon loss on timescales relevant to Earth’s climate system.
主题	Evolution and Ecology (EEP)
URL	http://pure.iiasa.ac.at/id/eprint/15459/
来源智库	International Institute for Applied Systems Analysis (Austria)
引用统计
资源类型	智库出版物
条目标识符	http://119.78.100.153/handle/2XGU8XDN/131524
推荐引用方式 GB/T 7714	Walker T,Kaiser C,Strasser F,et al. Microbial temperature sensitivity and biomass change explain soil carbon loss with warming.. 2018.