雨型和种植模式对鄱阳湖平原区农田水土流失的影响OA北大核心CSTPCD

[Objective]The aims of this study are to analyze the response of farmland surface runoff and sediment loss to rainfall patterns under different planting modes,to explore the laws of farmland surface runoff and sediment transport in the Poyang Lake plain area under new circumstances,and to provide scientific basis for preventing and controlling farmland surface soil erosion.[Methods]64 rainfall events were classified using K-means clustering method,and combined with monitoring data such as runoff and sediment production in runoff plots,the impact of surface runoff and sediment losses in different rainfall types of farmlands under three planting modes were analyzed.[Results](1)The duration,rainfall and maximum rainfall intensity of 30 minutes were taken as the rainfall characteristic indicators.The rainfall could be divided into 4 types(type A:'medium duration,small rainfall and light rainfall intensity',type B:'short duration,small rainfall and medium rainfall intensity',type C:'long duration,heavy rainfall and medium rainfall intensity',and type D:'short duration,medium rainfall and heavy rainfall intensity').(2)The variation of runoff and rainfall of each planting mode was basically the same,and the runoff was also more when the rainfall was larger.In each month,dry farming mode produced the most runoff.(3)No matter what type of rainfall,the runoff and sediment losses of dry farming mode were the highest.Under the types A and C,the runoff and sediment yields of water farming mode were the lowest.Under the type B,the runoff reduction effect of water and dry rotation mode was the best.(4)There were significant differences in the total runoff and sediment loss under different planting modes,and the performance followed the order:dry farming mode＞paddy upland rotation mode＞paddy farming mode.[Conclusion]In conclusion,compared with the dry farming model,the water farming model has certain advantages in reducing runoff and sediment,especially when dealing with type A and type C,the effect of runoff and sediment reduction is more obvious.