石羊河流域NDVI的季节时空变化研究

Study on the Spatial-seasonal Change of NDVI in Shiyang River Basin

利用NASA提供的逐月合成的石羊河流域2007年MODIS-NDVI数据,配合气象台站资料,分析了该流域NDVI季节时空变化特征。结果表明:石羊河流域NDVI季节变化与植被的生物学特性、物候变化相一致,具有明显的季节性规律;在空间上具有明显的分异性,表现为南部祁连山高寒半干旱半湿润区季节变化显著,中部走廊平原温凉干旱区季节变化明显,北部温暖干旱区除少数绿洲外季节变化不明显。

Using the information of observatory and the MODIS-NDVI data in Shiyang River Basin in 2007 provided by NASA, this paper analyzed the characteristics of NDVI＇s seasonal changes in time and space in this basin. The results showed that NDVI seasonal changes of Shiyang River Basin was in line with the biological characteristics of vegetation and the changes in phenology, which showed obviously seasonal pattern, There were also obvious differences in space. It was distinct seasonal changes in the southern Qilian Mountains of alpine cold seml-arid and semi-humid area, it was obvious seasonal variation in the central corridor plains which are arid and warm-cool, and it was no obvious seasonal changes in the northern area which are arid and warm except a little oasis.