The coupling effect on erosion and nutrient lost of arable,grassland and woodland,were studied based on different land-use patterns,with simulated rainfall equipment.The results showed that the runoff and sediment caused the soil became less fertile.The nutrient in sediment was higher than that in run-off,which was the main ways of nutrient losses.Man-made accelerated erosion caused by arable land tillage,soil erosion rate(SER) and sediment yield(SY) increased by 27.1% and 27.3%,but runoff yield(RY) decreas...