陕北吴起县退耕还林(草)成效的遥感监测分析  

Remote Sensing Analysis on Effect of Tillage Reverting to Woodland or Grassland in Wuqi,Shaanxi Province

作　　者：李登科[1] 

机构地区：[1]陕西省农业遥感信息中心,陕西西安710014

出　　处：《中国沙漠》2009年第1期125-130,200,201,共8页Journal of Desert Research

基　　金：国家自然科学基金项目(40375011)资助

摘　　要：利用GIS综合解译分析NOAA/AVHRR、TM和DEM数据,揭示吴起县退耕还林(草)生态建设工程所取得的实效。1998—2003年NOAA/AVHRR遥感监测表明,吴起县域版图在遥感影像上凸现,这就是该县通过实施退耕还林(草)工程留在大地上的绿色印记,表明吴起县植被状况正在逐年改善,而且植被恢复情况明显好于周围区域。退耕前后的LANDSAT TM影像解译结果对比分析说明,吴起县近年来退耕还林(草)的成绩是显著的,生态环境有了明显的改善。与1997年相比,到2004年该县有81.31%耕地不再耕种,退出的耕地主要变为草地、林地和果园;林草覆盖度增加显著,由1997年的37.06%提高到2004年的83.63%;高坡度耕地绝大部分实现退耕,大于25°的坡耕地89.36%实现了退耕;低植被覆盖度的土地面积在大幅度减少,植被覆盖度小于10%的面积减少了90.91%。土壤侵蚀强度总体上降低,但土壤侵蚀状况仍然严重,需要继续加强治理。The effect of a project of reverting tillage to woodland or grassland ecosystems has been revealed by GIS combined with synthetically analyzing NOAA/AVHRR, TM and DEM data. The territory of Wuqi County in northern Shaanxi province was gradually clear-cut on NOAA/AVHRR images from 1998 to 2003. It is a green mark that the project had made. Vegetation was not only getting better and better in Wuqi, but also better than the surroundings. The results of interpreted LANDSAT TM images before and after the project showed that the effect of the project was remarkable and the eco-environment has got obvious improvement. Comparing with 1997, 81.31% of farmlands in 2004 were no longer cultivated and were used as pasture, woodland or garden. The coverage of woods and grass was 37.06% in 1997 and 83.63% in 2004. 89.36% of farmland on escarpment was not cultivated. The area with vegetation coverage less than 10% was decreased by 90.91%. Soil erosion intensity was depressed as a whole, but its situation is still severely and it needs further improving.

关 键 词：植被 退耕还林(草) 遥感监测 吴起县 

分 类 号：X171.4[环境科学与工程—环境科学]