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

文献类型： 外文期刊

作者： Wu, Yali 1 ; Huang, Weichen 1 ; Zhou, Feng 1 ; Fu, Jin 1 ; Wang, Sheng 2 ; Cui, Xiaoqing 1 ; Wang, Qihui 1 ; Bo, Yan 1 ; Yan 1 ;

作者机构： 1.Peking Univ, Sino France Inst Earth Syst Sci, Coll Urban & Environm Sci, Minist Educ,Lab Earth Surface Proc, Beijing 100871, Peoples R China

2.Yunnan Univ, Inst Int Rivers & Ecosecur, Kunming 650091, Yunnan, Peoples R China

3.Anhui Agr Univ, Coll Resources & Environm, Hefei 230036, Peoples R China

4.Liaoning Acad Agr Sci, Inst Plant Nutrient & Environm Resources, Shenyang 110161, Peoples R China

5.Heilongjiang Acad Agr Sci, Inst Soil Fertilizer & Environm Resource, Harbin 150086, Peoples R China

6.Jiangxi Acad Agr Sci, Inst Soil & Fertilizer & Resources & Environm, Nanchang 330200, Jiangxi, Peoples R China

7.Yangtze Univ, Coll Agr, Jingzhou 434025, Peoples R China

8.Chinese Res Inst Environm Sci, Natl Engn Lab Lake Pollut Control & Ecol Restorat, Beijing 100021, Peoples R China

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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