Stoichiometric imbalance of soil carbon and nutrients drives microbial community structure under long-term fertilization

文献类型： 外文期刊

第一作者： Huang, Yaping

作者： Huang, Yaping;Wang, Qiqi;Zhang, Wenju;Xiao, Qiong;Wu, Lei;Tian, Yanfang;Xu, Minggang;Wang, Qiqi;Zhu, Ping;Gunina, Anna

作者机构：

关键词： Long-term fertilization; C; N and P stoichiometry; Nutrient imbalance; Soil microbial community structure

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：4.046； 五年影响因子：4.884 ）

ISSN： 0929-1393

年卷期： 2021 年 168 卷

页码：

收录情况： SCI

摘要： Fertilization affects soil microbial community by altering soil organic carbon (C) and nutrients availability. However, it remains unclear how changes in stoichiometric C, N, and P ratios resulting from fertilization affect microbial community. We investigated a 26-year field experiment receiving inorganic fertilizers (N, NP, PK, and NPK), organic N combination (with manure and straw), natural recovery (fallow), and no fertilizer (control). The aim of this study was to explore the responses of microbial community to C: N:P stoichiometry in soil and microbial biomass of topsoil (0-20 cm) and subsoil (20-40 cm). Results showed that compared to control treatment, organic application increased the ratio of fungi to bacteria (F:B) in topsoil and gram-negative bacteria to grampositive bacteria (G-:G+) in subsoil. However, application of inorganic decreased both the F: B and G-:G+ ratio in topsoil. Increasing soil C, N and P availability resulted from inorganic fertilizers and organic combination fertilization caused stoichiometric imbalance between soil and microbial biomass. As a result, the F:B and G-:G+ ratio were positively related to C:N imbalance but negatively associated with N:P imbalance in topsoil. Redundancy analysis (RDA) showed that main factors regulating microbial community were pH, C:P and N:P imbalances in topsoil, whereas TDN, N:P imbalance, DOC and soil C:N in subsoil. Furthermore, C:P and N:P imbalance explained 16.4% in topsoil, and N:P imbalance explained 22.0% in subsoil of microbial community variation. These results reveal the shifts of soil microbial community are driven by changes in soil pH and C, N and P stoichiometric imbalance from long-term fertilization.

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