摘要
应用遥感监测并结合地面实测数据,分析黄河中游砒砂岩地区典型流域--内蒙古长川流域植被盖度及其变化特征.经野外实测数据进行检验植被盖度遥感监测的精度发现,以遥感手段通过植被盖度与归一化植被指数(NDVI)之间关系来估算长川流域植被盖度的精度达到81.3%.长川流域上游地区(北部)植被盖度相对较高,达到40%～70%;沟道两侧也有相对较高的植被盖度,也达到了30%～60%;一般梁峁地植被盖度较低,只有5%～15%.从1983年开始实施的小流域第一期水土流失重点治理和1993年至1997年期间实施的小流域第二期第一阶段水土流失重点治理的效果明显,使得长川流域植被盖度在该期间内大幅度增高.
The Changchuan watershed in Inner Mongolia belongs to the typical region in the soft rock area of middle Yellow River. This paper has revealed the dynamics of vegetation coverage by the remote sensing technique integrated with ground measurement. The preliminary results are as follows： The remote sensing technique is an effective survey method for the spatial-temporal vegetation coverage analysis in macro-scale; With verifying by ground measurement data, the precision of remote sensing technique can reach 81.3%; The vegetation coverage in upriver Changchuan watershed is relatively high, on both sides of channels vegetation coverage is also comparatively high, but the vegetation coverage on water-incised hill is generally low. During the period from 1976 to 2000, the vegetation coverage in the watershed was significantly improved through integrated measures of soil erosion control.
出处
《中国沙漠》
CSCD
北大核心
2005年第6期880-885,共6页
Journal of Desert Research
基金
国家自然科学基金项目(40401009)
国家重点基础研究发展规划项目(G2000018604)资助
关键词
黄河中游砒砂岩地区
植被盖度
动态
遥感监测
vegetation coverage
dynamic
remote sensing monitoring
soft rock area of middle Yellow River
