摘要
植被盖度是评估生态环境的一个重要参数，为了对黄土丘陵地区退耕还林还草效果进行监测与评价，研究通过归一化植被指数（NDVI）遥感估算安定区2001年和2004年植被盖度变化。通过分析得出：2001-2004年安定区整体植被盖度有所增加，尤其是退耕还林还草的区城，低盖度植被类型面积大大减少，植被盖度〈60％的类型面积共减小了967．5hm^2，而高植被盖度面积增加。通过坡度与植被指数空间叠加分析发现，坡度对植被盖度较高区域的影响较小，对于植被盖度较低的区域影响较大。对于低植被盖度区域来说，坡度小则植被恢复快，坡度大则恢复较慢。
Vegetation covers is an tion dynamic changes in Anding important ecological and region, Dingxi city were land to forest or grass land based on NDVI estimate. The environmental parameter. In this paper, vegetaanalyzed to evaluate the effects of convert farmresults showed that during 2001-2004, the overall vegetation coverage had increased, especially in the project areas and areas with low vegetation coverage area had reduced greatly. By spatial overlay analysis of slope gradient and vegetation index, it was found that slope gradient affected vegetation restoration significantly in regions with the low vegetation coverage the smaller of slope gradient, the faster vegetation restoration.
出处
《西北林学院学报》
CSCD
北大核心
2008年第1期50-53,共4页
Journal of Northwest Forestry University
基金
甘肃省科技攻关项目(QS031-31-02)
甘肃省沙漠综合治理技术研究创新团队
关键词
NDVI
退耕还林还草
效果评价
坡度
黄土丘陵沟壑区
NDVI
convertion of farmland to forest or grass land project
effects evaluation
slope gradient
loess hill and gully area
