川西高原植被特征及其气候变化的相关分析

利用常规气象资料及NOAA-AVHRR的归一化植被指数（NDVI）资料和趋势系数、皮尔逊相关、Morlet小波分析等统计诊断方法，分析了1982年1月-2002年12月川西高原植被和气候因子（气温和降水）的变化特征及其相关关系和周期特征。结果表明：川西高原地区植被覆盖良好，大部分区域植被覆盖增加，局部退化（高原南部和东部）；气温总体呈增加趋势，降水量总体少变，局部有所减少；NDVI与气温和降水有一定相关性，其中与气温的相关性比与降水相关性大；NDVI周期约为5和10年左右，与降水和气温周期相同。川西高原地区植被及气候特征的分析为川西高原旅游和经济的发展规划提供依据，为研究川西高原的生态、气候资源提供参考。

Vegetation Characteristics and with Climate Change Correlation Analysis in Western Sichuan Plateau

Basing on the routine meteorological station data and NOAA-AVHRR normalized vegetation indices （ND- VI） and tendency coefficient, with the method of Pearson correlation, Morlet wavelet analysis and so on, this paper analyzed the spatial and temporal variation characteristics of vegetation and climate factors （temperature and precipi- tation） and their correlation and period characteristics in Western Sichuan Plateau form January 1982 to December 2002. The results show that the vegetation cover in Western Sichuan Plateau is in good condition. In most region, the vegetation is increasing and in some local area, such as in southern and eastern Western Sichuan Plateau, there is some degradation; Temperature are generally increasing; precipitation is less change overall and decreases in local area. There is certain correlation between NDVI and temperature and rainfall. The correlation between NDVI and temperature is larger than that with rainfall. The period of NDVI is about 10 years and 5 years or so, so are the rain- fall and temperature. The analysis of characteristics of vegetation and climate provides the reference for research of e- cological, climate resource and the development planning of tourism and economic in Western Sichuan Plateau.