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在黑龙江省选择了28个站点,利用MODIS卫星数据,研究了2008年与2009年该省作物主产区归一化植被指数的时空变化规律,并与作物发育期的观测资料进行了对比分析,还对归一化植被指数(NDVI)与平均旬气温间的相关性进行了分析。结果表明:旬平均气温与反映作物生长量的NVDI值关系密切;NDVI值可以很好地反映作物的生长情况;2009年与2008年的粮食总产的增幅明显低于往年的增幅。NDVI可以作为作物低温冷害的一个检验指标。
28 sites were selected in Heilongjiang Province. Using MODIS satellite data, the temporal and spatial variation of normalized vegetation index of the main crop areas in the province in 2008 and 2009 were studied and compared with the observed data of crop development. The correlation between Normalized Vegetation Index (NDVI) and mean daily temperature was also analyzed. The results showed that: the average temperature of ten days was closely related to the NVDI value reflecting the growth of crops; the NDVI value could well reflect the growth of crops; the growth of total grain output in 2009 and 2008 was obviously lower than that in previous years. NDVI can be used as a test indicator of crop cold damage.