近40年来金沙江南岸干热河谷区的土地利用变化及其土壤侵蚀治理研究--以云南宾川县为例

云南金沙江流域生态环境极为脆弱,在人为作用下土地利用/土地覆被变化较为显著,水土流失严重,生态环境日益恶化,目前已被我国政府列为全国生态环境建设的重点区域.本文选择金沙江中游中山高原与干热河谷区较为典型的宾川县作为研究实例,采用航片判读、实地调查与GIS等方法编制1960、1980和2000年土地利用与土壤侵蚀图,据此分析了该县1960～2000年的土地利用/土地覆被变化及其引发的土壤侵蚀变化特征,重点揭示区域土地利用/土地覆被变化的基本规律及其引发的土壤侵蚀变化过程,并提出土壤侵蚀治理的工程与技术措施.

Land Use Change and Soil Erosion Control in Dry-hot Valley Zone in the Middle Reaches of Jinsha River during 1960- 2000:--a Case Study in Binchuan County, Yunnan Province

Jinsha River Basin in Yunnan Province, which is the most ecologically fragile mountain area and one of the areas with the most severe soil erosion as well as one of the areas with most the notable LUCC in China, has been on Chinese Government's list of the nation's key areas to be improved ecologically. This paper is to reveal the basic trend of this area's LUCC and soil erosion change and to provide a basis for the future sustainable use of land resources by studying Binchuan County, a typical place in medium-altitude mountain-plateau and dry-hot valley zone in the middle reaches of Jinsha River. Based on the County's land use/cover and soil erosion map in 1960, 1980 and 2000 drawn with the aid of aerial photograph interpretation, field investigation and GIS mapping techniques, the paper is to study the County's LUCC during the period from 1960 to 2000 and soil erosion change arising from it. In addition, the paper sums up the main experiences and lessons of harnessing land ecological environment from 1960 to 2000 in the County, and puts forward some proposals of engineering and techniques for harnessing land ecological environment in the County.