基于MODIS数据的三北防护林工程区植被覆盖度提取与分析  

Retrieval and analysis of vegetation cover in the Three-North Regions of China based on MODIS data

作　　者：吴云[1,2] 曾源[1] 吴炳方[1] 李晓松[1] 武文波[2] 

机构地区：[1]中国科学院遥感应用研究所,北京100101 [2]辽宁工程技术大学测绘与地理科学学院,辽宁阜新123000

出　　处：《生态学杂志》2009年第9期1712-1718,共7页Chinese Journal of Ecology

基　　金：中国科学院知识创新工程重大项目资助(KZCX1-YW-08-02)

摘　　要：以像元二分模型为基础,构建了基于归一化植被指数(NDVI)的植被覆盖度定量估算模型,并利用MODIS-NDVI时间序列数据,估算了三北防护林工程区2001年8月和2007年8月的植被覆盖度,分析了三北防护林工程区植被覆盖度的时空变化特征。结果表明:2001—2007年三北防护林工程区植被覆盖度变化较为明显,平均覆盖度增加了2.07%,其中吉林、山西、陕西和宁夏四省变化幅度最为显著,增加幅度分别达到27.37%、14.12%、9.29%和9.22%。研究区植被覆盖度增加的主要自然原因是降雨量的增加,主要人为原因是人们环境意识的提高以及国家实施的封山育林、退耕还林还草等一系列生态保护政策,特别是三北防护林体系建设工程。The Three-North Shelter Forest Program which brings great influence to the eco-environment （Three-North Regions）. In this paper, the vegetation （TNSFP） covers 13 provinces of China, of North, Northeast and Northwest China cover in the Three-North Regions was estimated by using a dimidiate pixel method based on the MODIS-NDVI data in August 2001 and 2007, with its spatiotemporal changes analyzed. In 2001-2007, the vegetation cover in the Three North Regions had an obvious change. The mean coverage increased by 2.07% , and the incre- ment in Jilin, Shanxi, Shaanxi, and Ningxia provinces reached to 27.37%, 14. 12% , 9.29% , and 9.22%, respectively. The increase of the vegetation cover was mainly caused by the increas- ing of precipitation and the enhancement of peoples＇ environmental awareness, as well as the implementation of closing hillsides to facilitate afforestation, returning farmland to forest/grassland, and especially, the TNSFP.

关 键 词：植被覆盖度 像元二分模型 MODIS NDVI 三北防护林 

分 类 号：S718.5[农业科学—林学]