川西高原植被和陆面温度变化

Changes of Vegetation and Land Surface Temperature over the West Sichuan Plateau

川西高原是我国南水北调西线工程的引水区,是我国长江上游地区的一个重要水资源补给区,研究川西高原植被覆盖和陆面变化具有非常重要的意义。利用MODIS反演的NDVI和LST资料,分析了川西高原地区植被和陆面温度的变化。高原的NDVI和LST变化趋势有明显的季节差异。春季高原的NDVI表现为南少北多的趋势,夏季高原的ND-VI变化不明显。秋季和冬季,高原大部分地区的NDVI表现为减少的趋势,冬季的NDVI减少最明显。春季高原的陆面温度表现为降低的趋势,夏季高原陆面温度为增加趋势。在秋季,高原的西部和西北部地区,陆面温度是增加的,高原南部和东部地区陆面温度有比较明显的降低趋势。在冬季,高原主体陆面温度表现为比较明显的增温趋势。在春季和冬季,高原主体部分的NDVI和LST变化相反。夏季和秋季,高原主体部分的NDVI和LST的变化趋势一致。

The West Sichuan Plateau is the water source area of the West Route of the South-to-North Water diversion Project as well as the important water supply area of the upper reaches of the Yangtze River. Therefore it is very important to research the vegetation and land surface change over The West Siehuan Plateau. The NDVI and LST data from MODIS by inversion are used to analyze the vegetation and land-surface change over the Plateau, which appear seasonal change obviously. In spring, the NDVI is low in the south and high in the north of the Plateau. It has little change in summer. In autumn and winter, it decreases in most area over the Plateau. While in winter, the NDVI has a most obvious decrease. As to the land-surface temperature over the Plateau, it decreases in spring and increases in summer. In autumn, it increases in the western and northwestern part while obviously decreases in the southern and eastern part of the Plateau. In winter, the temperature in the main part of the Plateau increases obviously. The NDVI and I.ST have different change trends in spring and winter while similar in summer and autumn.