Abstract
In this paper GIMMS/NDVI data was utilized to analyze the vegetation cover characteristcs of spatio-temporal variation and its response to temperature and precipitation change in Northwest China during 1982 to 2006.The results show that: the annual average NDVI has been increased with an rate of 0.5%/10a in Northwestern China,the vegetation cover was significant increased in July,August and October.The vegetation cover was significant increased in Xinjiang Tianshan,Artai Mountains,Gansu Qilian Mountains and the eastern part of Qinghai;and it was declined from Germu to Yushu in Qinghai,most parts of Shaanxi and Talimu Basin,Tulufan,Tahe,Tuoli in Xinjiang.It was positive correlation between vegetation cover and temperature and precipitation inter-annual changes.However,it was a significant linear relationship between the vegetation cover and the monthly average temperature and precipitation during the years.The relation with high positive correlation between the vegetation cover and the monthly average temperature,but when the average monthly temperature was exceed 20℃ and the NDVI decreased;when the average monthly precipitation was in the 0~100 mm,the NDVI was increased with linear,however,when the average monthly precipitation was more than 100mm,a clear growth trend was no longer exist.
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