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Straw returning on sloping farmland reduces the soil and water loss via surface flow but increases the nitrogen loss via interflow

文献类型： 外文期刊

作者： Jing, Xuekai 1 ; Li, Li 3 ; Chen, Shanghong 4 ; Shi, Yulong 1 ; Xu, Mingxiang 2 ; Zhang, Qingwen 1 ;

作者机构： 1.CAAS, Agr Clean Watershed Grp, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China

2.Northwest A &F Univ, Coll Forestry, Acad Forestry, Yangling 712100, Shaanxi, Peoples R China

3.Changjiang Water Resources Commission, Changjiang River Scient Res Inst, Wuhan 430310, Peoples R China

4.SAAS, Inst Agr Resources & Environm, Chengdu 610011, Peoples R China

5.Inst Soil & Water Conservat, CAS & MWR, State Key Lab Soil Erosion & Dryland Farming Loes, Yangling 712100, Shaanxi, Peoples R China

6.CAAS, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China

关键词： Extreme rainfall; Sloping farmland; Nitrogen loss; Interflow; Dissolved organic nitrogen

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：6.576； 五年影响因子：7.088 ）

ISSN： 0167-8809

年卷期： 2022 年 339 卷

页码：

收录情况： SCI

摘要： The eutrophication caused by nitrogen loss from sloping farmland is a serious concern, especially in the context of increasing frequency of extreme rainfall events. The relative importance that the surface runoff and interflow processes govern the nitrogen loss under extreme rainfall events, however, is ambiguous. Moreover, this ambiguity could be further enhanced by conservation practices on sloping farmland, such as straw returning and contour tillage. To better understand these ambiguities, five simulated rainfall experiments at the intensity of 100 mm h(-1) under four treatments including downslope tillage (DT), cross-slope tillage (CT), cross-slope tillage with whole straw returning (CT + WR), cross-slope tillage with crushed straw returning (CT + CR), were con-ducted in 2 years' maize season on a typical purple sloping farmland in the hilly area of Sichuan, China. Results showed: 1) Compared with DT, straw returning and cross-slope tillage significantly reduced surface runoff and nitrogen load of surface runoff. However the concomitant potential increase of the interflow runoff would result in the increase of nitrogen loss via interflow, offsetting the benefits of conservation practices; 2) The nitrogen loss through interflow is 6.38 +/- 0.21 kg ha(-1), accounting for 77.9 % of the total nitrogen loss and suggesting that interflow is the dominant process; 3) Dissolved organic nitrogen is one of the main nitrogen loss forms, accounted for 41.06 % (24.31-57.69 %) of the total nitrogen loss in surface runoff and 32.02 % (12.28-47.81 %) for interflow, should not been ignored; 4) The results of the three prediction models showed that the nitrogen loss caused by interflow drainage under extreme rainfall should not be ignored. These findings enhance our understanding of nitrogen exports induced by extreme rainfall events and provide references for nitrogen loss predictions and control in sloping farmland.

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