中国亚热带低丘红壤地区水土流失是造成土壤退化的重要原因 ,而土地利用方式的改变是形成严重水土流失的最主要原因。该区第一次土地利用方式变化发生在 2 0世纪 50年代后期 ,自然的次生林被开垦为茶园。第二次变化发生在 80～ 90年代联产承包制改革时期 ,农民有更大的自由决策 Soil erosion in the subtropical hilly red soil region is an important cause of soil degradation, and the change of land use pattern is the most important reason for the formation of serious soil erosion. The first change in land use patterns in the area occurred in the late 1950s and natural secondary forests were reclaimed into tea gardens. The second change took place during the reform of the contract of co-generation contract system in the 1980s and 1990s, and farmers had greater freedom to make decisions