Disentangling the direct and indirect effects of cropland abandonment on soil microbial activity in grassland soil at different depths

文献类型： 外文期刊

第一作者： Xu, Hongwei

作者： Xu, Hongwei;Liu, Guobin;Xue, Sha;Yang, Xiaomei;Xu, Hongwei;Liu, Guobin;Xue, Sha;Qu, Qing;Liu, Guobin;Xue, Sha;Yang, Xiaomei;Chen, Yanhua;Wang, Minggang;Yang, Xiaomei

作者机构：

关键词： Plant-soil interactions; Vegetation restoration; Soil enzyme activity; Soil nutrients; Structural equation models

期刊名称：CATENA （ 影响因子：5.198； 五年影响因子：5.594 ）

ISSN： 0341-8162

年卷期： 2020 年 194 卷

页码：

收录情况： SCI

摘要： Cropland abandonment strongly affects plant-soil interactions. However, knowledge remains limited about how the production and diversity of plants and soil physicochemical parameters drive changes in soil microbial activity (such as microbial biomass, respiration, and enzyme activity) after cropland abandonment. Here, we investigated a grassland restoration chronosequence (0-30 years) to determine the dynamics of soil microbial biomass, respiration, and enzyme activity in the Loess Hilly, Region (China). Overall, cropland abandonment caused an increase in soil microbial activity primarily in the 0-20 cm soil layers. The metabolic quotient in the 0-10 cm layer decreased linearly with time since abandonment (recovery years). Structural equation models showed that recovery years directly and indirectly affected changes to soil microbial activity. Plant species richness, aboveground biomass, and soil organic carbon explained a large proportion of the variability in soil microbial activity in the 0-20 cm layer. However, the variability in soil microbial activity was mostly explained by plant species richness, belowground biomass, and soil total nitrogen in the 20-50 cm layers. Our results indicate that during recovery after cropland abandonment, changes in soil microbial activity are driven by plant characteristics and soil physicochemical parameters, with different drivers at different soil depths.

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