摘要
以库尔勒市域为研究区,基于1990、1998、2006和2011共4期TM遥感影像提取归一化植被指数(NDVI),将NDVI结果输入到像元二分模型中计算得到研究区各时期植被覆盖度,然后根据研究需要将植被覆盖度划分为4个等级,最后计算覆盖度差值并结合各级覆盖度转移矩阵和土地利用情况分析了库尔勒市域植被覆盖度动态变化特征。结果表明,在1990、1998、2006和2011年间,库尔勒市域总体植被覆盖情况有所改善,植被恢复改善面积比退化面积多23.8%,其中东南部的扇形绿洲平原植被状况改善明显,北部和南部区域植被有所退化。
The vegetation coverage changes in Korla region have crucial impacts on local and regional climate,agriculture and economy.This study uses the Landsat TM data to investigate the vegetation coverage changes in this region from 1990 to 2011（four periods in 1990,1998,2006,and 2011）.The vegetation coverage is calculated using the NDVI data,derived from raw TM images,and a mixed pixel model.We further classify the vegetation coverage into four categories and analyze the main characteristics of its changes using transpose matrices of each vegetation coverage category and land use data.The results show that,overall,the vegetation coverage has improved from 1990 to 2011in the Korla City region.The area with increased vegetation is 23.8% higher than that with decreased vegetation.The vegetation coverage in southeastern sector oasis plain greatly increased,while vegetation degraded in the north and south region.
出处
《草业科学》
CAS
CSCD
北大核心
2015年第7期1069-1078,共10页
Pratacultural Science
基金
国家自然科学基金项目(41361082)
