2001～2010年长江上游植被时空变化特征分析

Study on temporal-spatial change of vegetation cover in upper Yangtze River from 2001 to 2010

为了研究2000年退耕还林还草和天然保护工程的实施对长江上游区域植被覆盖的影响,以MODIS/NDVI为基础遥感数据,将趋势分析法与变化矢量分析法相结合,对2001~2010年长江上游植被覆盖时空变化特征进行分析。研究结果显示,10 a间流域年均NDVI呈略微增加趋势,其中嘉陵江流域NDVI上升趋势最明显,金沙江、大渡河、岷沱江流域NDVI增加趋势最不明显；大部分地区植被覆盖处于恢复态势,在这些地区,大部分植被覆盖变化属于轻度或中度恢复型。

In order to study the influence of conversion of cropland to forest and grass and the protection project of natural for-est on vegetation cover in upper Yangtze River from 2001 to 2010, the trend analysis method and change vector analysis method were employed to investigate the temporal-spatial change of vegetation cover based on the MODIS/NDVI data. The results re-vealed that the annual NDVI of the upper Yangtze River showed a slightly increasing trend during the 10 years. The most signifi-cant increasing trend was in Jialing River Basin, while the most slightly increasing trend existed in Jinsha River Basin, Dadu Riv-er Basin and Min-tuo River Basin. The vegetation cover was experiencing restoration in most of the basin. The vegetation cover change showed a light or moderate restoration in most of vegetation cover restoration regions.