Grazing-induced microbiome alterations drive soil organic carbon turnover and productivity in meadow steppe

文献类型： 外文期刊

第一作者： Xun, Weibing

作者： Xun, Weibing;Ren, Yi;Xiong, Wu;Cui, Zhongli;Zhang, Ruifu;Xun, Weibing;Zhang, Guishan;Zhang, Ruifu;Yan, Ruirui;Jin, Dongyan;Xin, Xiaoping

作者机构：

关键词： Temperate meadow steppe; Cattle grazing; Microbial composition; Soil incubation; SOC-decomposition enzymatic activity; Soil productivity

期刊名称：MICROBIOME （ 影响因子：14.65； 五年影响因子：15.677 ）

ISSN： 2049-2618

年卷期： 2018 年 6 卷

页码：

收录情况： SCI

摘要： Background: Grazing is a major modulator of biodiversity and productivity in grasslands. However, our understanding of grazing-induced changes in below-ground communities, processes, and soil productivity is limited. Here, using a long-term enclosed grazing meadow steppe, we investigated the impacts of grazing on the soil organic carbon (SOC) turnover, the microbial community composition, resistance and activity under seasonal changes, and the microbial contributions to soil productivity. Results: The results demonstrated that grazing had significant impacts on soil microbial communities and ecosystem functions in meadow steppe. The highest microbial a-diversity was observed under light grazing intensity, while the highest beta-diversity was observed under moderate grazing intensity. Grazing shifted the microbial composition from fungi dominated to bacteria dominated and from slow growing to fast growing, thereby resulting in a shift from fungi-dominated food webs primarily utilizing recalcitrant SOC to bacteria-dominated food webs mainly utilizing labile SOC. Moreover, the higher fungal recalcitrant-SOC-decomposing activities and bacterial labile-SOC-decomposing activities were observed in fungi- and bacteria-dominated communities, respectively. Notably, the robustness of bacterial community and the stability of bacterial activity were associated with a-diversity, while this was not the case for the robustness of fungal community and its associated activities. Finally, we observed that microbial a diversity rather than SOC turnover rate can predict soil productivity. Conclusions: Our findings indicate the strong influence of grazing on soil microbial community, SOC turnover, and soil productivity and the important positive role of soil microbial a-diversity in steering the functions of meadow steppe ecosystems.

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