Based on the long term(2002-2005) in situ runoff plots observation experiment in Yan gully catchment in Dean county,Jiangxi province,the characteristics of runoff and eroded sediment under different mixed and relay plantation types and their response to rainfall events were compared to identify the effects of mixed and relay plantation on the soil erosion of sloping orchard land.The interaction between the soil structure,soil water retention capacity and external environmental forces,such as rainfall,evapor...