以大兴安岭北坡为研究对象,利用2000—2009年的MODIS NDVI数据,对该区域10年间植被指数时空变化进行分析。结果表明:大兴安岭北坡植被指数在月尺度上,3月份为最低,7—8月份为峰值;季节变化波动明显,夏季植被指数最高,冬季植被指数最小,春季升温对植被生长具有促进作用;年平均植被指数变化范围在0.43~0.49之间,气温和降水量在一定区间值内对年植被指数变化有正向反馈;在空间尺度上有显著的差异,整个研究区植被指数均值为0.46;植被指数在10年间以正向变化为主,中部和东北部地区植被覆盖受到的干扰较大,时间上的波动强烈。

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.