抚顺露天煤矿西排土场植被变化遥感分析.docVIP

 抚顺露天煤矿西排土场植被变化遥感分析# ） 5 10 15 20 25 30 35 40 45 摘要：植被构建是排土场生态环境修复的基本目标，也是排土场生态环境修复的重要技术选 择。本文基于不同时期的 TM 遥感影像，分析排土场地表植被指数与矿区环境变化，以揭示 排土场植被变化规律。结果表明，排土场的岩土排放与地表扰动有很大的无序性，没有明确 的区域界限与时间界限，植被恢复也不具有显著的时间关联性。矿区生产活动是影响排土场 植被状况的主要因素，植被空间分布主要与干扰强度与频率有关。岩土排放阶段，地表扰动 强烈，植被条件很差。在岩土排放停止后，排土场具有一定的自我修复能力，可在较短的时 间内形成杂草植被。土地复垦工程实施对改善排土场地表植被条件有积极作用，裸露地表减 少，林地植被指数最高，农田区植被指数偏低。排土场复垦为农田，建设成本与生产管理成 本相对较高，产出有限，且生态效应较低，不是最佳选择。 关键词：露天煤矿；排土场；遥感；植被变化；归一化植被指数 中图分类号：TP79 Analysis of Vegetation Change on Western Dump-site of Fushun Surface Coal Mine by Remote Sensing WANG Dongsheng (College of Environmental Science and Engineering, Liaoning Technical University, LiaoNing FuXin 123000) Abstract: Vegetation restoration and rehabilitation (VRR) is the basic objectives of dump site environmental remediation, and is the important technology choice of dump-site environment Remediation too. This paper was based on different periods of TM remote sensing image，by means of the analysis of normalized difference vegetation index (NDVI) and environmental change in mining area to explore vegetation variation of dump site. The results show that waste rock discharge and external interference had no clear regional boundaries and time limits, so that the vegetation recovery of dump site does not have temporal and spatial correlation. During the waste rock discharge stages, mine operation and external interference were the key factors which impacted vegetation condition of dump-site strongly. And after dump-site closed, external interference disappear, weed vegetation formed within a relatively short period by ecosystem self-repair. It is positive for vegetation conditions of dump site that land reclamation projection put into effect. The proportion of barren land reduced, and the proportion of high NDVI value area increased. Woodland fraction NDVI value was highest, but the farmland fraction NDVI value was low relatively. Dump-site converted to farmland was not a good choice because of the high cost of const