摘要
根据每周的NOAA全球植被指数(GLOBALVEGETATIONNDVI,GVI),分析了西藏拉萨地区1985—1999年GVI的变化趋势及其与降水、气温等主要气候要素的相关性,并选择沿91°E和30°N两条区域内典型的样本带,进一步分析了这两个样本带上基于1km分辨率NOAANDVI反映的地表植被随季节的变化情况。研究表明,1985—1999年长时间序列的NOAAGVI反映了拉萨地区以天然植被为主的植被覆盖的生长特点,包括季节和年际变化。自20世纪80年代中期到90年代末拉萨地区以天然植被为主的植被覆盖状况有所好转;拉萨地区NDVI值对降水的变化很敏感,月平均NDVI和月降水总量之间存在明显的相关,其相关系数达0.75,而与温度的相关系数为0.63。
Based on NOAA GLOBAL VEGETATION, GVI of every week, the change trend of GVI in Lhasa, Tibet in 1985—1999 and its relation to the precipitation and temperature were analyzed. There are two sampling bands along 91°E and 30°N to be selected, in which the changes of surface vegetation with season reflected NOAA NDVI of 1 km. The results show that the NOAA AVHRR NDVI of the long time series in 1985—1999 can reflect the vegetation growth of nature vegetation in Lhasa area, including seasonal and interannual variations. From the middle of 1980′s to the end of 1990′s, there is good change for the vegetation growth in Lhasa area. Finally, the NDVI value is sensitive to precipitation variations in Lhasa area. A marked relation exits between monthly NDVI and monthly precipitation and its correlation coefficient is 0.75, and that of the temperature is 0.63.
出处
《高原气象》
CSCD
北大核心
2003年第B10期145-151,共7页
Plateau Meteorology
基金
中国气象局成都高原气象研究所高原气象开放实验室基金资助
