GIS支持下生态敏感性评价--以济南市长清区为例

Ecological Sensitivity Assessment Based on GIS:Take Changqing District of Jinan as an Example

为深入研究长清区生态系统对区域内部环境对于人类活动干扰的敏感程度,选定2020年长清区Landsat-8遥感影像和30 m分辨率的数字高程模型为基础数据,并对其进行前期准备,得到以高程、坡度、坡向、水系和归一化植被指数(NDVI)作为评价指标的济南长清生态敏感性评价体系。首先进行单因子评价,并将研究区分为基于该因子评价下的高敏感区、中敏感区、低敏感区以及非敏感区,利用层次分析法确定各敏感因子的权重,包括高程、坡向、坡度、水系、NDVI,而后经过加权叠加获得所需的济南市长清区生态敏感性综合评价图。

In order to study the sensitivity of ecosystem to natural and human activities in Changqing district of Jinan city,Landsat8 remote sensing images and DEM 30 m resolution digital elevation of Changqing district in 2020 were selected as the basic data.The remote sensing image was pre-processed by ArcGIS software,and the slope and aspect were extracted by DEM data.Water system,road traffic,landscape and vegetation planning index(NDVI)are used as evaluation indexes of Changqing sensitivity evaluation system in Jinan.The natural discontinuity classification method(Jenks)was used to re-classify the raster data,and the study area was divided into high sensitive area,medium sensitive area,low sensitive area and non-sensitive area by single factor evaluation.It uses the analytic hierarchy process(AHP)to determine the weight,and ArcGIS weighted overlay tool is used to get the ecological sensitivity comprehensive evaluation map of Changqing district.