Nutrient losses of five kinds of land use systems in the Three Gorge Reservior Area was studied.Measurement data revealed that the annual nutrient loss of different land use systems varied.The trend is that:sloping agriculture field>terraced fields>terraced orchard>sloping orchard.In different land use systems,the relation among rainfall amount,rainfall intensity and runoff,sediment delivery is different.But they all reached 5% significance level.In different land use systems,the percent of nutrient output ...