基于RS与GIS研究山地城市扩展对植被覆盖度的影响——以重庆市南岸区为例

Study on the Impact of Urban Expansion on Vegetation Coverage Based on RS and GIS——Taking Nan'an District of Chongqing City as an Example

文章以典型性山地城市重庆市南岸区为例,利用RS和GIS对南岸区近7年的城市土地利用现状数据进行筛选,并建立空间数据库,在时间和空间上分析建设用地扩展对植被覆盖度的影响。研究表明:城市扩展的建设用地范围内主要是低植被覆盖度区域和较低植被覆盖度区域,同时新增建设用地的植被覆盖度较低,但会随着时间的变化,向上一级植被覆盖度转移;城市扩展的方向主要在正东方向,与低植被覆盖度和较低植被覆盖度区域扩展的方向基本一致。研究结果对于促进山地城市土地资源集约化利用、维护生态安全和促进城市可持续发展具有重要意义,同时还可以为建设生态城市和城市规划提供重要依据。

This paper takes the Nan＇an District of Chongqing City as an example to study the effect of mountaincity expansion on the spatial and temporal characteristics of vegetation cover. RS and GIS are used to extract the data ofurban land use in the Nan＇an distract for the past 7 years,and the spatial database is established. Based on the spatialanalysis function of ArcGIS,this paper analyzes the temporal and spatial characteristics of vegetation coverage in moun-tainous cities. The results show that the coverage area of urban expansion is mainly low vegetation coverage area andlow vegetation coverage area,and the vegetation coverage of new construction land is low,but it will change with time,The direction of urban expansion is mainly in the east direction,with the low vegetation coverage and low vegetationcoverage area is basically the same direction of expansion. The research results are of great significance to promote theintensive utilization of land resources in mountainous cities,maintain ecological security and promote the sustainable development of cities,and provide important basis for the construction of eco-cities and urban planning.