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Xu, Hongwei; You, Chengming; Tan, Bo; Xu, Lin; Liu, Yang; Wang, Minggang; Xu, Zhenfeng; Sardans, Jordi; Peñuelas, Josep
The Science of the total environment, 07/2023, Volume: 881Journal Article
Livestock grazing of grassland ecosystems may induce shifts in microbe community traits and soil carbon (C) cycling; however, impacts of grassland management (grazing) on soil C- microbe community trait (microbial biomass, diversity, community structure, and enzyme activity) relationships are unclear. To address this, we conducted a global meta-analysis of 95 articles of livestock grazing studies that vary in grazing intensities (light, moderate, and high) and durations (<5 years, 5–10 years, and > 10 years). We found that gazing decreased soil organic carbon content (SOC; 10.1 %), and activities of the enzymes of saccharase (SA; 31.1 %), urease (UA; 7.0 %), and acid phosphatase (11.9 %) in topsoil. Meanwhile, the SOC, soil microbial biomass and enzyme activities consistently decreased as grazing intensity and duration prolonged. Furthermore, we observed strong linear relationships of microbe community traits with SOC (p < 0.05), but weak relationships with soil N or P (p > 0.05) in grasslands, which also depends on the grazing intensity and duration. In conclusion, our results indicate that traits of soil carbon content, soil microbe community, and in particular their relationships in global grasslands are overall significantly affected by livestock grazing, but the effects strongly depend on the grazing intensity and duration. Display omitted •Both grazing intensity and duration decreased soil organic carbon•Light and/or moderate grazing increased soil bacterial and fungal diversity•Grazing duration decreased soil microbial biomass and enzyme activity•Grazing intensity strengthened the linkage of microbial diversity with soil carbon
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