摘要
运用RS和GIS技术,选取了1990年、2000年、2009年三期遥感影像,采用基于归一化植被指数(NDVI)的像元二分模型,计算了这三个时期的植被覆盖度,并对班戈县1990～2009年间植被覆盖度的变化情况进行了定量分析。结果表明,班戈县的植被退化面积,从1990年31.80×104 hm2减少到2009年156.28×104 hm2,植被覆盖面积减少了77.89×104 hm2。从动态变化看,1990年到2000年草地退化较严重,2000年到2009年,草地退化程度增加趋势不明显。
On the basis of RS and GIS techniques,remote sensing images of three periods(1990,2000,and 2009) were used to analyze the changeable characteristics of vegetation coverage in Bange county.The vegetation coverage was calculated based on two components sub-pixel mode.The vegetation coverage and its changes between 1990 and 2009 were also analyzed quantificationally.The result showed that the vegetation coverage decreased from 318 000 km in 1990 to 1 562 800 km2 in 2009,and the 778 900 km2 vegetation lost in the past 20 years.The grassland generation phenomenon was more serious between 1990 to 2000 from the dynamic change,and the increasing trends of grassland degradation were not very obvious during 2000～2009.
出处
《物探化探计算技术》
CAS
CSCD
2011年第6期669-672,576,共4页
Computing Techniques For Geophysical and Geochemical Exploration
基金
西藏重大农业生态环境问题防护技术研究([2007]71)
关键词
班戈县
植被指数
植被覆盖
植被退化
bange county
NDVI
vegetation coverage
vegetation degeneration
