Temperature sensitivity of permafrost carbon release mediated by mineral and microbial properties.
Temperature sensitivity of permafrost carbon release mediated by mineral and microbial properties.
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DOI：
10.1126/sciadv.abe3596
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发表时间：
2021-08
期刊：
影响因子：
13.6
通讯作者：
Yang Y
中科院分区：
文献类型：
--
作者：
Qin S;Kou D;Mao C;Chen Y;Chen L;Yang Y
大规模证据表明，矿物和微生物性质调节了冻土C释放及其温度响应。冻土解冻后碳(C)释放的温度敏感性（Q10）是预测气候变暖条件下冻土碳动态的重要参数。然而，目前尚不清楚矿物保护如何与微生物特性和内在抗逆性相互作用，从而影响永久冻土C的命运。我们发现，矿物保护和微生物特性是冻土C在解冻时动态变化的两种重要预测因子。高C释放和辅酶10均与弱有机无机关联相关，但微生物丰度和活性较高，而高微生物多样性对应于低辅酶10。矿物保护的衰减效应和微生物特性的双重作用将使永久冻土c -气候反馈比以前认为的更加复杂。
Large-scale evidence reveals that mineral and microbial properties mediate permafrost C release and its temperature response. Temperature sensitivity (Q10) of permafrost carbon (C) release upon thaw is a vital parameter for projecting permafrost C dynamics under climate warming. However, it remains unclear how mineral protection interacts with microbial properties and intrinsic recalcitrance to affect permafrost C fate. Here, we sampled permafrost soils across a 1000-km transect on the Tibetan Plateau and conducted two laboratory incubations over 400- and 28-day durations to explore patterns and drivers of permafrost C release and its temperature response after thaw. We find that mineral protection and microbial properties are two types of crucial predictors of permafrost C dynamics upon thaw. Both high C release and Q10 are associated with weak organo-mineral associations but high microbial abundances and activities, whereas high microbial diversity corresponds to low Q10. The attenuating effects of mineral protection and the dual roles of microbial properties would make the permafrost C-climate feedback more complex than previously thought.
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影响因子：
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