Raindrop-induced ejection at soil-water interface contributes substantially to nutrient runoff losses from rice paddies

文献类型： 外文期刊

第一作者： Wu, Yali

作者： Wu, Yali;Huang, Weichen;Zhou, Feng;Fu, Jin;Cui, Xiaoqing;Wang, Qihui;Bo, Yan;Wang, Sheng;Yang, Shuyun;Wang, Na;Gu, Xuejia;Chen, Jingrui;Zhu, Jianqiang;Wu, Yali

作者机构：

关键词： Rice paddy; Nitrogen; Phosphorus; Non-point source; Model simulation; Multiple-site assessment

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：5.567； 五年影响因子：6.064 ）

ISSN： 0167-8809

年卷期： 2020 年 304 卷

页码：

收录情况： SCI

摘要： Nitrogen (N) and phosphorous (P) ejections driven by raindrops promote the solute concentrations in the surface runoff and thereby the runoff losses from croplands. Compared to a considerable number of studies on upland fields, little evidence for the importance of raindrop-induced ejection has been generated for rice paddies primarily due to the lack of field observations and appropriate modeling system. Our extensive rainfall simulation experiments, along with the update of a physical-based solute transport model, shed new light onto the contribution made by raindrop-induced ejection to the total runoff losses from 6 typical rice paddies across China. Raindrop-induced ejection accounted for 22-59 % to 27-63 % of the total runoff losses of N and P across China, respectively, regardless of rice-growing stages. The rainfall intensity and initial concentrations in ponded water explained most (43 % for N and 53 % for P) of the variance of raindrop-induced ejection. N and P runoff losses were further underestimated by 23 % and 29 %, respectively, if ignoring the raindrop-induced ejection at soil-water interface in the model. Progress toward mitigating the runoff losses from rice paddies and associated water pollution will be difficult without reduction in the raindrop-induced ejection particularly in the rice paddies with higher extreme precipitation and more fertilizer application in future.

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