State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Environ Sci Technol. 2023 Mar 7;57(9):4027-4038. doi: 10.1021/acs.est.2c08855. Epub 2023 Feb 22.
Glacier-retreated areas are ideal areas to study soil biogeochemical processes during vegetation succession, because of the limited effect of other environmental and climatic factors. In this study, the changes of soil dissolved organic matter (DOM) and its relationship with microbial communities along the Hailuogou Glacier forefield chronosequence were investigated. Both microbial diversity and DOM molecular chemodiversity recovered rapidly at the initial stage, indicating the pioneering role of microorganisms in soil formation and development. The chemical stability of soil organic matter enhanced with vegetation succession due to the retaining of compounds with high oxidation state and aromaticity. The molecular composition of DOM affected microbial communities, while microorganisms tended to utilize labile components to form refractory components. This complex relationship network between microorganisms and DOM components played an important role in the development of soil organic matter as well as the formation of stable soil carbon pool in glacier-retreated areas.
冰川退缩区是研究植被演替过程中土壤生物地球化学过程的理想区域，因为其他环境和气候因素的影响有限。本研究调查了海流沟冰川前缘时间序列上土壤溶解有机物质（DOM）的变化及其与微生物群落的关系。微生物多样性和 DOM 分子化学多样性在初始阶段迅速恢复，表明微生物在土壤形成和发育中的先驱作用。随着植被演替的进行，土壤有机质的化学稳定性增强，因为高氧化态和芳构化化合物得以保留。DOM 的分子组成影响微生物群落，而微生物则倾向于利用易降解成分形成难降解成分。这种微生物和 DOM 成分之间的复杂关系网络在土壤有机质的发育以及冰川退缩区稳定土壤碳库的形成中发挥了重要作用。
