State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Commun Biol. 2021 Dec 8;4(1):1376. doi: 10.1038/s42003-021-02907-3.
Irreversible climate change alters the decomposition and sequestration of soil carbon (C). However, the stability of C components in soils with different initial organic matter contents and its relationship with the response of major decomposers to climate warming are still unclear. In this study, we translocated Mollisols with a gradient of organic matter (OM) contents (2%-9%) from in situ cold region to five warmer climatic regions to simulate climate change. Soil C in C-rich soils (OM >5%) was more vulnerable to translocation warming than that in C-poor soils (OM ≤ 5%), with a major loss of functional groups like O-alkyl, O-aryl C and carboxyl C. Variations of microbial β diversity with latitude, temperature and precipitation indicated that C-rich soils contained more resistant bacterial communities and more sensitive fungal communities than C-poor soils, which led to strong C metabolism and high utilization ability of the community in C-rich soils in response to translocation warming. Our results suggest that the higher sensitivity of soils with high organic matter content to climate change is related to the stability and metabolic capacity of major bacterial decomposers, which is important for predicting soil-climate feedback.
不可逆转的气候变化改变了土壤碳（C）的分解和固定。然而，不同初始有机质含量土壤中 C 组分的稳定性及其与主要分解者对气候变暖响应的关系仍不清楚。本研究通过异地冷区向五个更温暖的气候区迁移具有有机质（OM）含量梯度（2%-9%）的黑土，以模拟气候变化。富碳土壤（OM>5%）中的土壤 C 比贫碳土壤（OM≤5%）对迁移增温更敏感，具有烷氧 C、芳基 C 和羧基 C 等功能基团的大量损失。微生物 β 多样性随纬度、温度和降水的变化表明，富碳土壤含有更具抵抗力的细菌群落和更敏感的真菌群落，这导致富碳土壤中 C 代谢强烈，群落的利用能力高，对迁移增温的响应较强。研究结果表明，高有机质土壤对气候变化的较高敏感性与主要细菌分解者的稳定性和代谢能力有关，这对预测土壤-气候反馈至关重要。
