Replacing chemical fertilizers with biogas slurry is an environment friendly strategy to reduce the risk of soil nitrogen leaching: evidence from the HYDRUS model simulation

文献类型： 外文期刊

第一作者： Wang, Hang

作者： Wang, Hang;Wang, Haitao;Liang, Xiaoyang;Wang, Jiandong;Qiu, Xuefeng;Wang, Chuanjuan;Wang, Hang;Wang, Haitao;Wang, Jiandong;Wang, Chuanjuan;Wang, Haitao;Wang, Jiandong;Wang, Jiandong

作者机构：

关键词： Biogas slurry drip irrigation; HYDRUS model; Organic fertilizer substitution; Nitrate leaching; Nitrogen migration; Nitrogen absorption

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：6.6； 五年影响因子：6.7 ）

ISSN： 0167-8809

年卷期： 2024 年 369 卷

页码：

收录情况： SCI

摘要： Excessive chemical fertilizer use leads to soil nitrogen leaching. Biogas slurry, which is rich in nitrogen, has been proposed as an organic substitute for chemical fertilizer via drip irrigation. However, the dynamics of nitrogen migration and potential threats to biogas slurry return remain unclear. Using a two-year field experiment and HYDRUS software, this study modeled soil moisture and nitrogen migration under biogas slurry drip irrigation. The validated model accurately simulates water and nitrogen migration, predicting nitrogen leaching dynamics. Compared to chemical fertilizer treatment, differences in soil hydraulic parameters under biogas slurry drip irrigation impact moisture and nitrate nitrogen distribution. Increasing biogas slurry proportion enhances nitrate nitrogen content in the root layer, promoting plant nitrogen absorption while reducing leaching by 49.66%. Optimizing the irrigation system involves high concentration substitution in early growth and low concentration in late growth, mitigating nitrogen leaching, and enhancing plant root absorption.

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