基于遥感的疏勒县植被覆盖时空变化研究

[目的]评价疏勒县生态环境质量及生态环境演变过程.[方法]基于Landsat遥感影像数据,利用归一化植被指数NDVI、像元二分模型、中心迁移模型等方法分析了 1996-2017年疏勒县植被覆盖时空演化.[结果]①疏勒县植被覆盖分布总体以高植被覆盖为主成大面积片状分布,中、低植被覆盖主要以盖孜河和克孜河为轴线,相对围绕高...

Spatiotemporal Variation of Vegetation Coverage in Shule County Based on Remote Sensing

【Objective】Healthy vegetation is essential to keeping ecosystem function,and understating spatiotemporal change in vegetation coverage in a biome can help evaluate its quality and sustainable production.The purpose of this paper is to test the feasibility of using remote sensing to monitor and evaluate change in vegetation coverage at large scale.【Method】We took Shule country as an example;spatiotemporal evolution of its vegetation coverage was analyzed based on the Landsat remote sensing imageries using normalized vegetation index,pixel dichotomy model and the center migration model.【Result】①The overall vegetation coverage in the county is high in most areas,with the low and moderate vegetation coverage distributed along the Gaizi and Kezihe rivers proximal to the high vegetation coverage areas.②Vegetation coverage in the county increased by 456.4 km² in 2017,up by 38.3%,compared with 1996.③There was spatial and temporal variation in the increase in vegetation coverage across the county,with increase in towns and villages in the south more significant than in other areas.④Vegetation coverage has increased from 1996 to 2017,especially between 2009 to 2013,with center of the vegetation coverage moving southeast.⑤Climate warming impacted the vegetation coverage indirectly in the long-term,while in the short term,anthropogenic activities,including improved irrigation and water-conservation projects,cultivated land reclamation,increase in forest belt area,affected the vegetation more.Increasing vegetation boosted agricultural demand for water,thereby reducing surface water and threatening sustainable development of the county.【Conclusion】Anthropogenic activities were more important than climate warming in increasing vegetation coverage in Shule county,indicating that ecological environment protection and management in the county are scientifically sound.