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Runoff and nutrient losses in alfalfa(Medicago sativa L)production with tied-ridge-furrow rainwater harvesting on sloping land

引用

International Soil and Water Conservation Research 2022年第2期10卷 308-323页

作者： Qi Wang Fuchun Li Xiaole Zhao Wucheng Zhao Dengkui Zhang Xujiao Zhou david jsample Xiaoyun Wang Qinglin Liu Xiaoling Li Guang Li Heling Wang Kai Zhang Jin Chen College of Grassland Science Gansu Agricultural UniversityLanzhou730070China Tongwei County Agricultural Technology Extension Center Dingxi743300China Department of Biological Systems Engineering Hampton Roads Agricultural Research and Extension CenterVirginia Polytechnic Institute and State Univ.Virginia BeachVAUSA Gansu Provincial Key Laboratory of Aridland Crop Science Gansu Agricultural UniversityLanzhou730070China College of Water Conservancy and Hydropower Engineering Gansu Agricultural UniversityLanzhou730070China College of Forestry Gansu Agricultural UniversityLanzhou730070China Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province Key Open Laboratory of Arid Change and Disaster Reduction of CMAInstitute of Arid MeteorologyChina Meteorological AdministrationLanzhou730020China Dingxi Institute of Soil and Water Conservation Dingxi743000China

Ridge-furrow rainwater harvesting(RFRH)is known to be effective in controlling water loss and soil erosion,and increasing soil moisture and crop yield in semiarid ***,it can cause water-logging,ridge overtopping,and harvest failure if not properly designed.A four consecutive-year field trial was carried out to assess the impacts of various slope gradients and tillage practices on soil moisture,runoff,sediment yield,associated soil nutrient losses,fodder yield,and water use efficiency(WUE)of alfalfa in the Loess Plateau,*** trial adopted a split-plot design,taking slope gradient(5and 10)as main plot treatment and tillage practice(traditional tillage,open-ridging,and tied-ridging)as split-plot treatment,from 2015 to *** were greater variations in runoff,sediment yield,and associ-ated soil nutrient losses than in fodder yield and ***-ridging and open-ridging resulted in decreased runoff and reduced sediment transport and associated soil nutrient losses,and increased soil moisture,fodder yield,and ***,sediment transport,and associated soil nutrient losses inclined with increasing slope;while fodder yield and the WUE *** slopes of 5and 10,the average decrease in runoff,sediment yield,total nitrogen,total phosphorus,and organic matter losses for open-ridging were 47.7e56.2%,91.0e92.7%,90.4e93.1%,90.1e92.2%,and 88.9e90.2%,respectively,while these for tied-ridging were 62.4e68.4%,94.5e96.4%,93.6e95.5%,93.9e95.9%,and 93.0e94.9%,over 4 years as compared with traditional *** mean annual runoff,sediment,total nitrogen,total phosphorus,and organic matter losses for slopes of 10were 1.31,1.96,1.87,1.99,and 1.64 times greater than the corresponding values for slopes of 5,*** increase of fodder yield and WUE for open-ridging and tied-ridging was 40.1e45.6%and 16.0e17.5%,and 3.66e5.99 and 1.35e2.50 kg ha^(-1)mm^(-1),respectively,for slopes of 5and 10.The average fodder yield and WUE for slopes of 5were 1.19

关键词： Runoff Sediment Nutrient loss Alfalfa fodder yield

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