玉米间作大豆行比配置对坡耕地水土流失的影响OA北大核心CSTPCD

[Objective]The aims of this study are to explore the soil erosion patterns of maize intercropping soybean with different row ratios,and to provide scientific basis for the promotion and utilization of maize intercropping soybean models with soil and water conservation effects in sloping farmland.[Methods]Taking maize intercropping with soybean as the research object under the condition of sloping farmland,the slope(10°,16°,22°)and rainfall intensity(40,80,120 mm/h)were selected.Through the artificial rainfall simulation experiment,the soil and water loss characteristics of maize,soybean monoculture and maize intercropping with soybean 2∶1(two rows of maize intercropping with one row of soybean),2∶2,2∶3,2∶4 row ratio were explored.[Results]Compared with maize monoculture,maize intercropping with soybean 2∶1,2∶2,2∶3 row ratio,and soybean monoculture,the surface runoff of maize intercropping with soybean 2:4 row ratio decreased by 64.23％,57.19％,31.17％,10.12％,0.36％,the erosion amount decreased by 82.90％,80.75％,46.53％,29.78％,36.33％,and the runoff time was delayed by 101.55％,49.06％,23.13％,30.77％,0.82％on average.Rainfall intensity was negatively correlated with runoff generation time and infiltration generation time,and positively correlated with runoff and erosion,while slope was negatively correlated with runoff generation time.Soil and water conservation effect of intercropping was better than that of soybean monoculture under high rainfall intensity and high slope.[Conclusion]In general,the 2∶4 row ratio of maize and soybean intercropping has better soil and water conservation effect under different rainfall intensity and slope,which is a reasonable and feasible crop diversity planting method in mountainous slope farmland.