Recovery through proper grazing exclusion promotes the carbon cycle and increases carbon sequestration in semiarid steppe

文献类型： 外文期刊

第一作者： Zhang, Wenbo

作者： Zhang, Wenbo;Li, Jing;Jin, Ke;Jiang, Shengyi;Zhang, Yong;Li, Yuanheng;Yang, Xiaojiang;Wang, Zhen;Zhang, Wenbo;Wang, Zhen;Struik, Paul C.;Ji, Baoming

作者机构：

关键词： Carbon cycle; C-cycle functional genes; Microbial community composition; Greenhouse gases; Semiarid steppe

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2023 年 892 卷

页码：

收录情况： SCI

摘要： Grazing exclusion changes soil physical-chemical characteristics, rapidly affects microbial community composition and function, and alters biogeochemical processes, e.g., carbon (C) cycle, over time. However, the temporal dynamics of CO2 emission and CH4 uptake during grassland restoration chronosequences remain poorly understood. We inves-tigated soil CO2 emission and CH4 uptake, the genes related to CO2 and CH4 production and reduction (cbbL, cbbM, chiA, and pmoA), and associated microbial communities under different durations of grazing exclusion (0, 7, 16, 25, and 38 years) to reveal the mechanisms and potential of soil CO2 emission and CH4 uptake in a semi-arid steppe. The results showed that a proper exclusion period could significantly improve soil physical-chemical conditions, veg-etation community, and soil C-cycling. The abundance of C-cycling functional genes (cbbL, cbbM, chiA and pmoA), CH4 uptake and CO2 emission rates showed a single-peak pattern with increasing duration of grazing exclusion, peaking at 16 years and then decreasing in the period between 25 and 38 years, indicating that the effect of exclusion weakened when the exclusion period was too long. The changes in C-cycling functional genes and microbial communities are pri-marily influenced by aboveground net primary productivity (ANPP), and are associated with CO2, CH4, soil water con-tent (SWC), and soil organic carbon (SOC). Structural equation modeling showed that increases in SOC content and pmoA abundance caused by an increase in ANPP accelerated CO2 emission and CH4 uptake rates, respectively. Our re-sults provide valuable insights into the critical role of grazing exclusion in promoting grassland restoration and carbon sequestration, and have potential implications for sustainable land management practices.

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