数字农科院2.0

Effect of shrubs on soil microbial abundance and fungi-to-bacteria ratio depends on grazing conditions in semiarid grasslands

文献类型： 外文期刊

作者： Li, Le;Liu, Jiahui;Wang, Jinsong;Jin, Yunxiang;Sun, Yu;Zhang, Jingmin;Zhu, Na;Wang, Xu;Xu, Dawei;Luo, Yuhong;Bao, Yufan;Xu, Nuo;Zhu, Biao;Yan, Yuchun

作者机构：

关键词： Shrub;Grazing;Soil microbial abundance;Fungi-to-bacteria ratio;Shrub-encroached grasslands

期刊名称： PLANT AND SOIL

ISSN： 0032-079X

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Background and aimsShrub expansion is widespread in global grasslands, with shrubs positively influencing soil microbial abundance compared to surrounding interspaces. However, how this effect varies under grazed and ungrazed treatments remains unclear.MethodsIn this study, we examined variations in plant and soil properties, as well as soil microbial abundance, between shrub patches (Caragana microphylla) and adjacent interspaces in paired grazed and ungrazed plots at three sites in semiarid grasslands on the Mongolian Plateau.ResultsOur results showed that shrubs significantly enhanced plant and soil functions, as reflected by increase in canopy height, plant cover, aboveground biomass and soil nutrient concentrations. However, the positive effect of shrubs on soil microbial abundance was observed only under grazed conditions, primarily mediated through aboveground biomass and soil nutrients. Although grazing reduced plant and soil functions, as well as soil microbial abundance, it amplified the relative advantages of shrubs. Notably, fungal abundance responded more strongly to shrubs than bacterial abundance under grazing, leading to a significantly higher fungi-to-bacteria ratio.ConclusionThese findings highlight the crucial role of shrubs in buffering grazing-induced environmental stress and provide new insights into shrubs' effects on plant and soil responses to human disturbances in semiarid grasslands.

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