丹霞地区水土流失遥感评价及空间分异——以贵州省赤水市为例

Remote Sensing Evaluation and Spatial Distribution of Soil Erosion in Danxia Area: A Case of Chishui City of Guizhou

为了定量查清丹霞地区赤水市的水土流失现状及10年来的动态变化,也为该区快速准确地评价水土流失和开展水土流失综合防治、保护世界自然遗产地生态环境等提供科学依据,基于ArcGIS空间叠加分析方法,综合考虑影响水土流失的地形坡度、植被覆盖率、土地利用类型和沟谷密度等主要因子,在遥感定量监测技术的支撑下对贵州省赤水市水土流失进行了分析,划分出流失强度等级,并得出其空间分异规律,最后与2000年数据对比,进行动态变化分析。结果表明,水土流失区域面积占赤水市面积比例比较低,水土流失状况不甚严重,水土流失强度等级较低,无极强烈和剧烈流失区域。与2000年相比,赤水市2010年水土流失比例下降了2.09个百分点,轻度水土流失面积下降了22.34 km2,中度水土流失面积下降了13.12 km2,强烈水土流失面积下降了2.28 km2。

In order to ascertain the status and the dynamic changes of soil erosion in the past 10 years,to evaluate and prevent the soil erosion,and to provide some scientific basis for protecting the ecology environment of the world natural heritage sites,the erosion grade,spatial distribution patter,and dynamic change regulation of soil erosion in Chishui city of Guizhou were analyzed under the support of RS and ArcGIS space analysis.The results indicated that the ratio of soil erosion areas to total area of Chishui city and the soil erosion intensity were low.There were no very strong and intense erosion areas.Compared with 2000,the soil erosion ratio decreased by 2.09 percentage points,the proportion of mild,moderate,and strong soil erosion decreased by 22.34 km2,13.12 km2,and 2.28 km2 respectively.