Evidence for large microbial-mediated losses of soil carbon under anthropogenic warming
Evidence for large microbial-mediated losses of soil carbon under anthropogenic warming
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DOI：
10.1038/s43017-021-00178-4
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发表时间：
2021-06-15
影响因子：
42.1
通讯作者：
Bradford, Mark A.
中科院分区：
文献类型：
--
作者：
Garcia-Palacios, Pablo;Crowther, Thomas W.;Bradford, Mark A.
人类活动引起的气候变暖将加速全球土壤有机碳（SOC）通过微生物分解的损失，但目前对SOC损失的程度还没有达成共识。在这个角度来看，我们认为，尽管这些损失背后的机械不确定性，有信心，一个强大的，积极的土地碳气候反馈可以预期。两个主要的证据支持全球SOC净损失与变暖通过增加土壤微生物代谢活动：增加土壤呼吸与温度和SOC的积累，在低年平均温度地区。变暖引起的SOC损失可能与排放谈判有关，需要更积极的减排目标，以在2100年前将气候变化限制在1.5摄氏度。我们认为，微生物群落温度的相互作用，以及它们是如何受到基板的可用性，是有前途的研究领域，以提高预测SOC losss.Degradation的幅度估计的准确性和精度预计将加速全球气温的升高，土壤有机碳的变化幅度是有争议的。这一观点讨论了支持土壤有机碳大量流失的证据及其更广泛的意义。
Anthropogenic warming is expected to accelerate global soil organic carbon (SOC) losses via microbial decomposition, yet, there is still no consensus on the loss magnitude. In this Perspective, we argue that, despite the mechanistic uncertainty underlying these losses, there is confidence that a strong, positive land carbon-climate feedback can be expected. Two major lines of evidence support net global SOC losses with warming via increases in soil microbial metabolic activity: the increase in soil respiration with temperature and the accumulation of SOC in low mean annual temperature regions. Warming-induced SOC losses are likely to be of a magnitude relevant for emission negotiations and necessitate more aggressive emission reduction targets to limit climate change to 1.5 degrees C by 2100. We suggest that microbial community-temperature interactions, and how they are influenced by substrate availability, are promising research areas to improve the accuracy and precision of the magnitude estimates of projected SOC losses.Degradation of soil organic carbon is expected to accelerate with increasing global temperatures, but the magnitude of change is controversial. This Perspective discusses evidence supporting a large loss of soil organic carbon and its broader significance.