长江上游及清江流域土地覆被变化分析

随着长江上游电站及清江流域电站开工、投产发电，其控制的流域成为重要敏感性区域。利用国家基础地理信息中心于2014年研制的2000，2010 年两期30 m分辨率土地覆被数据产品GlobeLand30，对2000~2010年长江上游及清江流域土地覆被的空间分布格局、变化幅度、区域差异及主要土地覆被类型的变化原因进行了综合分析。研究发现，总体上2010年较2000年，长江上游及清江流域耕地、森林变化率较低，分别为-0.09%，0.31%；冰川及永久积雪、人造地表、湿地、水体变化率较高，分别为-7.25%，22.9%，10.60%，2.87%。分析结果客观反映了气候变暖、城市扩张、水电站建设等活动对流域的影响，可为长江上游及清江流域调查、生态评价提供依据。

Analysis of land cover change in upper Yangtze River and Qingjiang River Basins

With the construction and electricity generation of hydropower stations in the upper Yangtze River and the Qingjiang River basins, the basins become important sensitive areas. In this paper, 30m-resolution imagine land cover data of GlobeLand30 in 2000 and 2010 developed by National Geomatics Center of China in 2014 were used to analyze the spatial distribution pattern, change rate, regional differences and change cause of main land types in the upper Yangtze River and the Qingjiang River basins between 2000 and 2010. It is discovered that, in general, the change rates of cropland and forest areas in the upper Yangtze River and the Qingjiang River basins are low with -0.09%,0.31% respectively; the change rates of glaciers and permanent snow, artificial land surface, wetlands and water bodies are higher, about -7.25%，22.9%，10.60%，2.87% respectively. The analysis objectively reflects the impact of climate warming, urban expansion, hydropower station construction, etc. on the upper Yangtze River and the Qingjiang River basins and the study results can provide basis for basin investigation, ecological assessment.