Precipitation Drives Soil Protist Diversity and Community Structure in Dry Grasslands

文献类型： 外文期刊

第一作者： Zhao, Jin

作者： Zhao, Jin;Guo, Wei;Zhao, Jin;Fan, Dandan;Zhuang, Xuliang;Kong, Weidong;Fan, Dandan;Zhuang, Xuliang;Kong, Weidong;Wu, Jianshuang;Zhang, Xianzhou

作者机构： Inner Mongolia Univ, Inner Mongolia Key Lab Environm Pollut Control & W, Hohhot 010021, Peoples R China;Chinese Acad Sci, Inst Tibetan Plateau Res, State Key Lab Tibetan Plateau Earth Syst & Resourc, Beijing 100101, Peoples R China;Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100039, Peoples R China;Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China;Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China

关键词： Precipitation; Soil protist; Diversity; Grassland; Dryland; Tibetan Plateau

期刊名称：MICROBIAL ECOLOGY （ 2022影响因子：3.6； 五年影响因子：4.2 ）

ISSN： 0095-3628

年卷期： 2023 年

页码：

收录情况： SCI

摘要： Protists are essential components of soil microbial communities, mediating nutrient cycling and ecosystem functions in terrestrial ecosystems. However, their distribution patterns and driving factors, particularly, the relative importance of climate, plant and soil factors, remain largely unknown. This limits our understanding of soil protist roles in ecosystem functions and their responses to climate change. This is particularly a concern in dryland ecosystems where soil microbiomes are more important for ecosystem functions because plant diversity and growth are heavily constrained by environmental stresses. Here, we explored protist diversity and their driving factors in grassland soils on the Tibetan Plateau, which is a typical dryland region with yearly low temperatures. Soil protist diversity significantly decreased along the gradient of meadow, steppe, and desert. Soil protist diversity positively correlated with precipitation, plant biomass and soil nutrients, but these correlations were changed by grazing. Structural equation and random forest models demonstrated that precipitation dominated soil protist diversity directly and indirectly by influencing plant and soil factors. Soil protist community structure gradually shifted along meadow, steppe and desert, and was driven more by precipitation than by plant and soil factors. Soil protist community compositions were dominated by Cercozoa, Ciliophora and Chlorophyta. In particular, Ciliophora increased but Chlorophyta decreased in relative abundance along the gradient of meadow, steppe and desert. These results demonstrate that precipitation plays more important roles in driving soil protist diversity and community structure than plant and soil factors, suggesting that future precipitation change profoundly alters soil protist community and functions in dry grasslands.

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