关键词: 大兴安岭北坡, 植被指数, 气温, 降水量, 时空变化

Abstract:

With the northern slope of Daxing'anling as the research object,the spatial and temporal changes of vegetation index in the region over the past 10 years were analyzed by using MODIS/NDVI data from 2000 to 2009.The results showed that the vegetation index on the northern slope of Daxing'anling was the lowest on the monthly scale,the highest in March,and the peak from July to August.The seasonal variation was obvious,the summer vegetation index was the highest,and the winter vegetation index was the smallest.The spring warm temperature promoted the vegetation growth.The annual average vegetation index varies from 0.43 to 0.49.The temperature and precipitation have positive feedback on the annual vegetation index change within a certain interval.There is a significant difference in spatial distribution.The average vegetation index of the whole study area is 0.46.The vegetation index was mainly positive in the period of 10 years,and the vegetation coverage in the central and northeastern regions was greatly disturbed,and the fluctuations in time were strong.

Key words: the north slope of Daxing'anling, vegetation index, temperature, precipitation, time and space changes