Changes of NDVI and Their Relations with Principal ClimaticFactors in the Yarlung Zangbo River Basin

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• 作者：Wei Zhang^a ; ^{zhzhangwei@yahoo.cn} ; Xinfeng Fu^b ; ^c
• 关键词：NDVI ; precipitation ; average air temperature ; vegetation cover ; Yarlung Zangbo River basin
• 刊名：Energy Procedia
• 出版年：2011
• 出版时间：2011
• 年：2011
• 卷：11
• 期：Complete
• 页码：3855-3862
• 全文大小：896 K

文摘

As an index denoting vegetation cover, NDVI is influenced by many climatic factors such as precipitation and average temperature. In this paper, NDVI is calculated on the basis of waveband characteristic of NOAA/AVHRR data for the YarlungZangbo River Basin. Then, the spatial-temporal change of NDVI is analyzed. The basin's NDVI is in consistency with season from 2001 to 2003.Large value zone of NDVI is mainly distributed in the lower reaches and part of the middle reaches. Meanwhile, point-data of principal climatic factors are interpolated to spatial grid data with Kriging method consistent with NDVI based on DEM of the YarlungZangbo River Basin. Then, the relation of NDVI and precipitation or average air temperature is analyzed with F checking and two-sample variance test in the basin. The result is P = 0, which shows that correlation analysis has larger confidence. The linear and logarithmic correlation of NDVI and precipitation or average air temperature is analyzed at confidence level of 0.05.The conclusion is that NDVI and precipitation and average air temperature in the basin vary with seasons and are closely correlated. The linear correlation coefficient of NDVI and precipitation is 0.8, and that of NDVI and average air temperature is about 0.77.And the logarithmic correlation coefficient of NDVI and precipitation is 0.71, and that of NDVI and average air temperature is 0.7.