关键词: 低山丘陵区, 小流域, 水土保持, 生态环境

Abstract: This text analyses the reasons and danger of soil erosion in the district of low mountains and hills, and points out that the comprehensive administration of soil erosion of low mountains and hills district should rely mainly on small basin comprehensive administration. The regularity of small basin soil erosion and the mode for comprehensive administration are explained according to small basin three ground form unit type, that is, woodgrass is prevented on the mountain top; economic forest belt is renovated on the hillside; technological measure that slope is changed to ladder manages on the hillfoot.The paper describes the ecological environment effect of comprehensive administration. When the soil is corroded, it carries the nutrient, with the losing amount of the cultivated land being the biggest and the losing amount of all N and P of the same high planting the least. The losing amount of organic matter, effective nitrogen and quickacting potassium of changeing slope to the ladder is better. It is proved that to protect fertile result of changing the slope to the ladder is better than the same high planting. The woodgrass vegetation improves the environment and raises the biodiversity function of ecosystem. This text will resume and establish the foundation for ecological environment recovery and sustainable agricultural development in the district of low mountains and hills.

Key words: low mountains and hill district, small basin, water and soil conservation, ecological environment