Impact of ryegrass cover crop inclusion on soil phosphorus and pqqC- and phoD-harboring bacterial communities

文献类型： 外文期刊

第一作者： Chen, Xiaodong

作者： Chen, Xiaodong;Wang, Yuan;Wang, Jianghong;Guo, Bin;Liu, Junli;Qiu, Gaoyang;Li, Hua;Wang, Yuan;Qiu, Gaoyang;Condron, Leo M.;Li, Hua

作者机构：

关键词： Ryegrass-rice rotation; Soil phosphorus fractions; Phosphatase enzyme activities; Inorganic P-solubilizing and organic P; mineralizing bacteria; pqqC and phoD gene communities

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：6.5； 五年影响因子：7.3 ）

ISSN： 0167-1987

年卷期： 2023 年 234 卷

页码：

收录情况： SCI

摘要： Italian ryegrass (Lolium multiflorum L.) is widely used as a cover crop with rice to promote soil fertility and reduce nutrient loss, although the specific impacts on phosphorus (P) dynamics and bioavailability are not clear. Soil samples were taken from a 4-year field experiment that included fertilized fallow-rice and ryegrass cover croprice rotations, together with an unfertilized fallow-rice control. Soil analyses included pH, total carbon (C) and nitrogen (N), together with soil P fractionations, acid and alkaline phosphatase enzyme activities, and assessment of the diversity and community of bacterial genes associated with inorganic P solubilization (pqqC) and organic P mineralization (phoD). Results showed that inclusion of the ryegrass cover crop enhanced biological P cycling in soil by significant increases in soil organic P and phosphatase enzyme activities compared with the fertilized fallow. The ryegrass cover crop was shown to reinforce the connection between soil P fractions and pqqC- and phoD-harboring bacterial communities, especially for the genus Rubrobacter. Cover crop inclusion also affected pqqC-harboring bacterial community composition by increasing the relative abundance of Actinobacteria, which reflected changes in the ratios of total P to total carbon and nitrogen in soil. In addition, the pqqC-harboring bacterial community was more affected by the ryegrass cover crop than the corresponding phoD-harboring community. The findings of this study demonstrated that the inclusion of ryegrass as a cover crop with rice significantly impacted biological P cycling in soil which may contribute to improved long-term P use efficiency.

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