归一化差值植被指数(NDVI)是植被生长状态和空间分布的指示因子,区域气候对植被生长起着重要作用,两者具有密切的相互关系。通过对黄河流域NDVI与降水、温度的年际变化趋势及相互关系的时空变化规律分析,发现该流域NDVI与降水、温度相关显著的植被类型以草地、灌木为主,但相关区域的空间位置随时间变化。流域尺度上,NDVI年较差、年均温度、月均温度在1982~1999年呈升高趋势,年降水量呈减少趋势;NDVI年较差与年降水、年均温度相关不明显(P>0.05);7月ND-VI与同期降水、温度相关显著,相关系数分别达0.855、0.943。栅格尺度上,流域内大部分地区NDVI年较差与年均温度相关不显著;与年降水相关显著的区域以正相关为主,分布于上游的草地、灌木区;与夏季降水相关显著的区域面积最大,占13.74×104km2,分布于上游的灌木和部分草地,其中7月NDVI与同期降水相关性较好,相关区域的面积有9.91×104km2,分布于中上游干流河道附近的草地、灌木;NDVI年较差与春、夏、秋季的平均温度以正相关为主;4月NDVI与同期温度以正相关为主,分布于兰州上游的草原和灌木,而10月以负相关为主,分布于兰州与宁夏北...
NDVI is an indicator of vegetation growth and its spatial distribution,with has a close relationship with climate conditions.By using Matlab and Arc/Info,this paper analyzed the spatial-temporal correlations of NDVI with the precipitation and temperature in the Yellow River Basin.The result showed that in the areas mainly covered with grass and shrub,NDVI had a significant correlation with precipitation and temperature(P<0.05),but the spatial positions of related regions changed with time.On basin scale,the...