一、问题的提出近年来,湖南湘、资、沅、澧四水流域,水土流失有所加重,生态环境趋向恶化,水旱灾患日益频繁,不但影响到农业的高产稳产,还直接关系到这些地区的合理治理和开发,已引起各方面的密切关注。目前,在如何评价四水流域水土流失的现状;其严重 First, the issue raised In recent years, Hunan Hunan, Ziyuan, 澧 Si Shui River basin, soil erosion has increased, the ecological environment tends to deteriorate, floods and droughts are more frequent, not only affects the high and stable agricultural production, but also directly related to these The reasonable management and development of the area have drawn close attention from all quarters. At present, how to assess the current situation of soil and water loss in the four water basins; it is serious