2000—2014年甘肃省NDVI时空变化特征

基于甘肃省2000—2014年MODIS-NDVI遥感数据及气象数据,采用趋势分析法及相关分析法,对甘肃省归一化植被指数(NDVI)的时空变化特征进行研究,探讨了植被变化对区域气候变化的响应。结果表明:近15年,生长季及春、夏、秋季NDVI均呈增加趋势。区域尺度上,夏季NDVI增加趋势最显著,增速为0.071/10a(P<0.01);像元尺度上,生长季NDVI呈增加趋势的面积最大,呈极显著增加(P<0.01)和显著增加(0.01

Spatial and Temporal Variations of NDVI in Gansu,China from 2000 to 2014

Based on MODIS NDVI and climate datasets during 2000-2014, used linear regression and correlation analysis, the spatiotemporal variations of NDVI in Gansu and their linkage with regional climate change were analyzed. The results showed that in the last 15 years, average NDVI of growing season, spring, summer and autumn all showed an increasing trend. The trend of summer was the most significant at regional scale, with a rate of 0.071/10 a (P<0.01). At pixel scale, the area of increasing trend in growing season was the largest, area with excellent (P<0.01) and significant (0.01 < P < 0.05) increasing trend covered 50.03% and 14.44% of the whole vegetation area respectively. Precipitation and humid index are the most important factors of vegetation growth in growing season and summer. Temperature, precipitation and humid index played equal roles in spring, temperature was the most important driving factor in autumn. The lag effect of temperature was obvious to NDVI in growing season. The precipitation and humid index in last season had effect on the vegetation growth of the coming season.