数字农科院2.0

Soil extracellular enzymes drive soil carbon accumulation under elevated CO2

文献类型： 外文期刊

作者： Zhang, Yixuan;Sun, Siyi;Zhou, Jiacong;Van Groenigen, Kees Jan;Delgado-Baquerizo, Manuel;Ma, Ying;Moorhead, Daryl L.;Hungate, Bruce A.;Smith, Pete;Terrer, Cesar;Liu, Ji;Sinsabaugh, Robert L.;Guo, Liping;Ochoa-Hueso, Raul;Power, Sally A.;Eivind Olesen, Jorgen;Luo, Yiqi;Cao, Junji;Jiang, Mingkai;Feng, Zhaozhong;Luo, Min;Chen, Ji

作者机构：

关键词： carbon-climate feedback;elevated CO2;soil extracellular enzyme;soil microorganism;soil nutrient;soil organic carbon

期刊名称： FUNCTIONAL ECOLOGY

ISSN： 0269-8463

年卷期： 2026 年

页码：

收录情况： SCIE（2025版）

摘要： Human-driven increases in atmospheric CO2 (eCO2) are stimulating plant growth, thereby increasing the input of plant-derived carbon into soils. The fate of this additional carbon depends on the capacity of soil microbiomes to decompose and transform organic matter, a central process in regulating soil organic carbon (SOC) dynamics. However, how eCO2 affects this microbial capacity remains poorly understood. Because soil extracellular enzymes catalyse the degradation of various SOC pools, their activities (extracellular enzyme activities, EEAs) could offer mechanistic insights into microbially mediated SOC dynamics. We synthesized 272 observations on SOC and EEAs from eCO2 experiments across farmland, forest, grassland and shrubland, combining classical meta-analysis with random forest modelling. Our results showed that eCO2 significantly increased SOC by 4.2%. Among all variables tested, increased cellulase activity, which targets the breakdown of labile carbon sources, emerged as the strongest predictor of SOC accumulation. Specifically, eCO2 stimulated cellulase activity by 12.2% but had no effect on ligninase activity, which decomposes recalcitrant carbon. This enzymatic shift was likely driven by increased plant-derived labile carbon inputs under eCO2 and was associated with changes in the soil microbiome, including a higher fungi-to-bacteria ratio. These results underscore the potential of EEA as a predictive indicator of SOC accumulation under eCO2 and the importance of representing enzymatic processes in Earth system models.Read the free for this article on the Journal blog.

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