长江流域水土流失历史发展过程探讨

长江流域水土流失的发生、发展和加剧 ,经历了长期的历史过程。据历史资料分析 ,长江流域在公元 10世纪前植被茂密 ,水土流失轻微 ;公元 10— 17世纪 ,水土流失有所发展 ;特别是 17世纪中叶以来 ,人口剧增 ,山丘过度开发 ,水土流失不断加剧 ,逐渐成为重大环境问题。人类对土地资源的不合理开发利用是导致水土流失的主导因素。

A Survey of Historical Expansion Process of Soil Erosion in the Changjiang River Valley

The occurring, expanding and aggravating of soil erosion in the Changjiang river valley have taken a fairly long period of time. According to analysis of hisorical material, soil erosion in the valley was slight with dense vegetation before the 10 th century. From 10 th century to 17 th century, the soil erosion area was expanded. Since mid 17th century, due to the sharp increase in population and excessive exploitation in the mountainous and hilly areas of the valley, soil erosion has been aggravated and become a serious environment problem. It was proved that the unreasonable exploitation of land resources by mankind is a leading factor causing soil erosion.