基于SPOT卫星NDVI数据的神东矿区植被覆盖动态变化分析

Analysis to vegetation coverage change in Shendong mining area with SPOT NDVI data

利用SPOT-4/5卫星的NDVI遥感数据,采用沙化土地分级变化检测与一元线性回归方法,对神东矿区1999—2008年植被覆盖和土地沙化的动态变化进行了分析.揭示了10 a来神东矿区的植被覆盖指数值整体呈增加趋势,矿区内绝大部分地表植被覆盖得到改善,其中明显改善区面积达82.13%,退化区面积不足1%;矿区沙漠化情况整体有所好转,重度沙漠化区面积比由88.33%下降到23.56%.结合矿区生态环境治理措施与实效分析,表明SPOT-4/5卫星的NDVI数据可用于中国西北地区大型煤矿区植被覆盖变化和土地沙化监测与分析.

Using NDVI data from SPOT -4/5 satellite, and applying the gradation-change detection method for land desertification and the unary linear regression method, the dynamic change, in 1999--2008, of the vegetation coverage and land desertification in Shendong coal mining area in Northwest China was analyzed. It is revealed that the NDVI in Shendong increases integrally, and the land vegetation coverage in most of the mining area is improved. The ratio of obviously improved area reaches to 82. 13%, while the ratio of degraded area is no more than 1%. The situation of land desertification is improved a lot in that the ratio of serious desertification area is decreased from 88.33% to 23.56%. It shows that the SPOT NDVI data can be used for the monitoring and analysis on vegetation coverage and land desertification in lager coal mining areas in Northwest China.