水土资源是人类赖以生存和发展的必不可少的物质基础。山区和丘陵地区的土地资源常常因严重水土流失被破坏,结果是这些地区的生产建设受到极大影响,并给下游地区带来灾害。因此,防治水土流失引起了世界上许多国家的重视,已经把它作为环境保护的重要内容。我国国土面积的70%左右属于山丘地区,水土流失十分严重,做好水土保持是实现水土流失地区农业现代 Soil and water resources are the indispensable material basis for human survival and development. Land resources in mountainous and hilly areas are often destroyed due to severe soil erosion, with the result that production and construction in these areas are greatly affected and disasters are caused to downstream areas. Therefore, prevention and control of soil and water loss has attracted the attention of many countries in the world and has taken it as an important part of environmental protection. About 70% of China’s land area belongs to the hill area, so soil and water loss is very serious. Soil and water conservation is the key to realizing agricultural modernization