基于多时相Landsat遥感影像的海州露天煤矿排土场植被时空特征分析

Monitoring of temporal and spatial change of vegetation in waste dump of Haizhou opencast coal mine area using multi-temporal Landsat remote sensing images

矿区土地复垦是目前土地整理的一项重要内容,也是矿区可持续发展实现的保障。矿区植被及其恢复状况是矿区土地复垦质量的一种重要的指示器,表征土地复垦的程度与质量。研究基于1975～2000年共4期遥感影像,构建植被覆盖度指数,考察辽宁省阜新市海州露天煤矿排土场25a来植被生长状况及时空变化特征。分析结果表明:1975～2000年间,研究区植被处于不断生长、逐渐恢复的状态,并存在明显的空间差异。时间尺度上,植被覆盖度较高(0.4～0.6)的区域所占面积比例从1975年的14.04%增长到2000年的34.83%;空间分布上,植被覆盖度低(0～0.25)的区域多分布在台地之间相连接的边坡位置上,植被覆盖度较高(0.25～0.6)的区域则分布于台地内部的平坦地面上。

Land reclamation in coalmine area is an important task of land consolidation, which ensures sustainable development of coalmine area. Vegetation and its recovery state is an important indicator of land reclamation quality, indicating the state and quality of land reclamation in coalmine area. Based on 4 phases＇ remote sensing images from 1975 to 2000, vegetation fraction index is used to indicate vegetation growth status and temporal/spatial variation result of waste dumps of Haizhou opencast coal mine area in 25 years. Experiment results indicate that vegetation in study area is in the process of developing and gradual recovery status, the area proportion of high vegetation fraction （0.4 -0. 6） zone increase from 14.04% in 1975 to 34.83% in 2000; the distribution of this high vegetation fraction area is temporal and spatial variated, low vegetation fraction area （0 -0.2） is in the slope of different terraces and high vegetation fraction （0.4 - 0. 6） area is in the middle of which.