近10 a阿克苏流域植被覆盖时空演变特征及影响因素

植被覆盖度是指示地表植被分布及生态环境变化的重要指标。为深入了解阿克苏流域植被覆盖度的时空演变特征及驱动机理,基于Landsat TM和高分1号遥感影像,采用NDVI像元二分模型和差值运算方法,对阿克苏流域2005—2015年的植被覆盖动态变化进行了监测分析及评价。结果表明近10 a来阿克苏流域植被覆盖整体呈良性发展趋势,8月份植被覆盖最丰富,植被覆盖度空间分布不均,差异较大;影响阿克苏流域植被覆盖的主要因素有降水、气象灾害、土地利用以及生态工程。阿克苏流域植被覆盖的时空演变研究结果能够为流域未来生态空间重构等提供重要的参考借鉴。

Vegetation Cover in Aksu River Basin over the Past Decade:Spatio-temporal Variation and Impact Factors

Vegetation cover is an important indicator of vegetation distribution on land surface and ecological changes in the environment.In this article, the temporal and spatial changes of vegetation cover in Aksu River Basin from 2005 to 2015 are obtained based on the NDVI dimidiate pixel model, and then the main causes of NDVI changes are analyzed based on Landsat TM and GF-1 WFV remote sensing images.Results indicate that vegetation cover in Aksu River Basin has showed a healthy tendency over the past decade.Vegetation cover is the richest in August,and the spatial distribution of vegetation cover is uneven with significant differences.Precipitation, meteorological disasters, land use and ecological construction project are main factors affecting the vegetation cover in Aksu River Basin.The results provide important reference for future eco-space construction in Aksu River Basin.