定南县岭北矿区植被覆盖与地形因子关系分析

Analysis on the Relationship between Vegetation Coverage and Landform Factors in Lingbei Mining Area,Dingnan County

以岭北稀土矿区植被退化的环境为研究背景,数据选择1990、1999、2008、2013四年30 m分辨率LandsatTM数据,利用像元二分模型估算研究区植被覆盖度;利用DEM数据获取研究区的坡度及坡向地形因子,并对不同地形因子进行定量评价。分析定南县岭北矿区植被覆盖度与不同地形因子条件的相关性,及不同地形因子条件下植被覆盖的分布特点。研究结果表明:植被覆盖度受高程、坡度影响较大,其中在高程400 m到500 m,坡度6°~15°区域内植被覆盖度较其他区域高,坡向影响主要表现在阳坡阴坡上,阴坡植被覆盖度普遍比阳坡高。研究结果能够快速、客观地反映稀土矿区植被的状况,为南方稀土矿区环境的治理和监测提供有效科学依据。

This paper takes the environment of degraded vegetation in Lingbei Rare Earths Mining Area as the research background.Landsat TM data of 30 m resolution in 1990,1999,2008 and 2013 are selected as research data,using pixel bipartite model to estimate vegetation coverage in the study area.The DEM data are used to obtain the slope and aspect landform factors in the study area and the quantitative evaluation of different these factors.The correlation between vegetation coverage and different landform factors in Lingbei mining area of Dingnan County is analyzed,and the distribution characteristics of vegetation coverage under different landform factors are analyzed.The research indicatesthat： the vegetation coverage is greatly affected by altitude and slope.Among them,vegetation coverage is higher in the range of elevations of 400 m to 500 m and slopes 6 ° to 15 ° than in other regions.The impact of slope direction is mainly reflected on the sunny slope and the shady slope,and the vegetation coverage of shady slope is generally higher than the sunny slope.The results of the study can reflect the status of vegetation in the rare earth mining area quickly and objectively and provide an effective scientific basis for the treatment and monitoring of the environment in the southern rare earth mining area.