基于遥感的NDVI与气候关系图式研究

The Image Forms of Correlation Between NDVI Change and Climate Factors in China Using Remotely Sensed Data

利用 198 3～ 1992年逐月的 NOAA/ AVHRR归一化植被指数 (NDVI)数字影像 ,计算了中国 NDVI动态变化与气温、降水变化的相关关系 .在此基础上 ,分析了中国 NDVI变化的区域分异规律 .其结果表明 :东北地区、内蒙东部以及青藏高原对降水的敏感度较高 ,而广大的华南平原、黄淮地区和新疆西部对气温的敏感度较高 .我国陆地 NDVI变化特征从东南到西北 ,呈现不同驱动因子及强度 ,且具有明显的地带状分布规律 .经研究表明中国1983～ 1992年间 NDVI变化空间差异存在气温、降水、气温降水共同驱动等 3种变化图式 .利用该图式可进一步表明中国 NDVI变化气候驱动的区域差异规律 .

In this paper, the monthly digital NDVI image with 8×8km spatial resolution is used to study the correlation between NDVI change and climate factors, such as temperature and precipitation, and the rules for the regional distribution of NDVI change form 1983 to 1992 in China. It shows that the driving factor of land cover change in Northeast China, East of Inner Mongolia inland and Tibet plateau is precipitation, and the leading driving factor of most South China region(southeast monsoon), Huanghuai plain and West Xinjiang region is temperature. From southeast to northwest, it shows difference driving factors and influencing intensities and it can be found obvious strap regularity. Based on these results, it is pointed out that there are three image forms of NDVI change driven by climate in China(driven by temperature, driven by precipitation and driven by temperature precipitation), and it indicates further the regional difference of NDVI change in China.