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中文摘要：
利用黑河中上游地区1982—2006年GIMMS／NDVI数据与九个气象站逐月气象数据分析了25年来该地区植被覆盖变化趋势，并对NDVI与温度、降水的关系进行了研究．结果表明：25年来研究区植被覆盖上升趋势明显，其中上升最明显的区域是上游干流周边草地与中游张掖绿洲一带，两区域年均NDVI与年份相关系数均达到0．5以上；NDVI的年际变化尺度上更加依赖于温度的变化，其增长趋势得益于20世纪80年代以来的气候变暖；研究区各地春季、夏季NDVI增长比较显著，秋季趋势不明显；不同季节NDVI对温度、降水的响应具有明显的差异性．
英文摘要：
In the middle and upper area of Heihe river basin, the focuse of our study on the variations of vegetation cover in the past 25 years using GIMMS/NDVI data during 1982-2006 and monthly meteorological data from 9 weather stations. The relationships among NDVI, temperature and precipitation were identified. The results show that the vegetation cover has maintained a steady upward trend in the past 25 years, especially in the meadow surrounding the upstream area and the Zhangye oasis located in the middle stream area. The annual average NDVI in the two regions are highly correlated （〉0.5） for these years. The yearly changes have been largely dependent on the temperature variations. The increasing trend in NDVI was mainly associated with the warming trending since the 1980s. The NDVI was more variable in spring and summer and relatively stable in autumn. The NDVI showed different responses to temperature and precipitation in different seasons.
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