摘要
基于遥感图像1999—2010年SPOT-VEGETATION NDVI数据,利用经验正交函数(EOF)分析方法,研究了近12a来三江源区植被变化的时空分布特征。结果显示近12a来源区植被覆盖呈整体增加趋势:(1)第一特征向量(方差贡献率为45.62%)及对应时间系数表明源区植被覆盖逐渐增加,且增速加快;(2)第二特征向量(方差贡献率为9.77%)及对应时间系数表明东南部和中部植被变化情况以退化为主,而东北部和西南部植被变化情况以增加为主。
Based on SPOT VEGETATION NDVI data from 1999 to 2010, the temporal and spatial distribution characteristics of NDVI in the Three-River Headwaters Region were analyzed by means of the Empirical Orthogonal Function (EOF). The results showed that (1) the vegetation NDVI of the Three-River Headwa- ters Region had a rising trend, and the first eigenvector(accounting for 45.62% of the total variance) and its temporal coefficients exhibited that the vegetation NDVI was improved with an increasing rate; that (2) the second eigenvector (accounting for 9.77% of the total variance) and its temporal coefficients displayed that the vegetation NDVI was reduced in southeastern and central area, and in contrast, it increased in northeastern and southwestern area.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2013年第3期234-239,共6页
Earth Science Frontiers
基金
中国工程院重点咨询项目"三江源生态补偿长效机制研究"
国家环境保护部专项"青藏高原重要生态功能保护研究"
关键词
三江源区
植被指数
时空特征
经验正交函数
the Three-River Headwaters Region
vegetation index(NDVI)
temporal and spatial distribution characteristics
EOF analysis