Abstract:Soil and water erosion is probably the most serious ecological environment problem in the Loess Plateau, especially on the slope fields of this semi-arid hilly gully region. It results in decline of top soil thickness, soil nutrients loss, water pollution, flood disaster and land productivity degradation. But the relationship between soil and water erosion and land productivity is not well defined yet. Without an adequate definition, the selection of proper management strategies to optimize perennial crop a...