Divergent effects of moderate grazing duration on carbon sequestration between temperate and alpine grasslands in China

文献类型： 外文期刊

第一作者： Zhang, Zhenchao

作者： Zhang, Zhenchao;Zhao, Yanhua;Sun, Juan;Hua, Ting;Li, Yanpeng;Wang, Yi;Wang, Fei;Sun, Jian

作者机构：

关键词： Moderate grazing; Grazing duration; Carbon sequestration; Grassland type; Meta-analysis

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 858 卷

页码：

收录情况： SCI

摘要： Moderate grazing has been widely proven to improve ecosystem functioning and have profound effects on the carbon cycling and storage in grassland ecosystems, which highly depend on grazing duration and grassland type. However, the effects of moderate grazing durations on carbon sequestration with different grassland types over broad geographic scales across China remain underexplored in the context of striving for carbon neutrality. Here, we explored the prob-ably different responses of carbon sequestration to moderate grazing duration for temperate and alpine grasslands based on 129 published literatures regarding the China's grasslands. The results showed the soil organic carbon stocks were significantly increased during short-term (<5 years) grazing duration, while significantly decreased during medium-(5-10 years) and long-term (>= 10 years) grazing durations in temperate grasslands. However, the soil or-ganic carbon stocks were significantly decreased during short-term grazing duration, while showed no significant changes during medium-and long-term grazing durations in alpine grasslands. The changes in soil organic stock were significantly positively correlated with the changes in belowground biomass, root:shoot, and microbial biomass carbon (P < 0.05). These findings suggest that the temperate grasslands change from carbon sink to carbon source with moderate grazing duration increasing, while the alpine grasslands present an opposite change pattern from carbon source to carbon sink, regulated by grazing-altered carbon input and microbial activities. Our study might have signif-icant implications for future sustainable management practices for carbon sequestration of China's grasslands.

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