中文摘要：

基于RS和GIS支持,利用SPOT-VGT逐旬NDVI数据,采用叠置分析法、均值法、频度统计法,对2000—2010年陕西汉江流域植被覆盖年际变化、季节变化及月尺度变化特征作了分析。结果表明：陕西汉江流域NDVI年际波动幅度较大,其中2002—2005年的NDVI变化较为剧烈,其它时段内为比较平稳的波动式上升;NDVI季节性节律明显,夏季的植被覆盖最好,冬季最差,春秋两季过渡,秋季略好于春季;月尺度上,植被覆盖最好的月份为5—10月,1月和2月最差,节律特征表现为NDVI从3月开始逐渐增大,7月达到峰值,之后逐渐降低,2月降到最低。

英文摘要：

With the method of superimposed analysis,averaging method,frequency statistics,the multi-time scale feature of Hanjiang river basin in Shaanxi province were analyzed using SPOT-VGT ten-day meteorological NDVI data based on RS and GIS.The results showed that： Inter-annual fluctuation range of NDVI is obviously in Shaanxi Hanjiang river basin during the period,in which NDVI changed more violently during 2002-2005,it was a little smoothly at the rest period.NDVI changes have obviously seasonal rhythm.Vegetation coverage is the best in summer,it was the worst winter,Vegetation coverage in autumn is slightly better than that in spring.At monthly scale,the better vegetation cover was at period from five to ten months,however,it was worse at January and February.NDVI began to increase gradually from March,up to peak in July,and then gradually reduced to minimum value in February.