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本文利用2002-2006年5-8月的MODIS 1B数据,建立NDVI时间序列,并结合气象数据中的月均温、月降水量、滞后1月和滞后2月累计降水量对内蒙古地区植被生长季NDVI的月际、年际变化规律以及NDVI变化同气候因子的相关性进行了分析。结果表明:月际变化上,5-8月NDVI不断增加,NDVI变化率5-6月>6-7月>7-8月;年际变化上,2002-2006年间,草地的波动性最大;在与气候因子的相关性上:滞后2月降水>滞后1月降水>月均温>月降水量;对于林地和草地来说,各种相关系数高纬高于低纬,对于农耕地来说各种相关系数基本相当;对于沙地来说,各种相关系数均不高,这与其植被稀少且几乎无变化有关。
Based on the MODIS 1B data from May to August in 2002-2006, the time series of NDVI were established. Based on the monthly average temperature and monthly precipitation, the monthly precipitation in January and the February rainfall in January, the vegetation growth season of Inner Mongolia The monthly and interannual variations of NDVI and the correlation between NDVI and climatic factors were analyzed. The results showed that the monthly NDVI increased continuously from May to August with the NDVI changing rate from May to June> June to July> July to August. In the interannual variability, the grassland fluctuated the most during 2002-2006. On the correlation with climatic factors: lag February precipitation> lag January precipitation> monthly average temperature> monthly precipitation; for woodland and grassland, the correlation coefficients are higher at high latitudes than at lower latitudes, and for farmland The correlation coefficient is basically the same; for sandy land, all kinds of correlation coefficient are not high, which is related to its vegetation with few and almost no change.