基于GIS与AHP的漓江流域阳朔段景观视觉吸收力评价

GIS and AHP-Based Evaluation of Landscape Visual Absorption Capacity in Yangshuo Section of Lijiang River Basin

以漓江流域阳朔段为例,评价研究区不同区域和不同景观要素的景观视觉吸收力,基于生物物理因素,利用GIS空间分析技术和层次分析法(AHP),通过ENVI监督分类法对遥感影像解译进行景观类型分类,基于景观视觉吸收力的测定原理和方法,对研究区景观基底的坡度、坡向、地势起伏度、植被丰富度、植被格局和土壤稳定性6个要素进行定性和定量相结合的视觉吸收力评价。结果表明,阳朔段不同区域的视觉吸收力差异较大,其中以漓江流域阳朔段内的漓江风景名胜区、海洋山保护区、架桥岭保护区、大源林场和阳朔国家森林公园所在片区的景观视觉吸收力相对最高。研究结果可见,各评价因子不同程度地影响着景观视觉吸收力的大小,就漓江流域阳朔段的自然和地理环境因素而言,影响视觉吸收力大小的最主要因素是植被丰富度,植物群落的面积及植被结构的组成对景观视觉吸收力的高低起主导作用。评估景观视觉吸收力可以指导相关部门更有效地进行景观规划和开发决策,为漓江流域阳朔段景观保护和规划建设提供重要依据。

Taking Yangshuo section of Lijiang River Basin as an example,the landscape Visual Absorption Capability(VAC)of different regions and various landscape elements in the study area were evaluated.Based on biophysical factors,GIS spatial analysis technology and analytic hierarchy process were used to classify the landscape types of remote sensing image interpretation through the supervision of the classification method by ENVI(the environment for visualizing images).Based on the measurement principle and method of VAC,six factors were adopted to evaluate the VAC qualitatively and quantitatively,including the slope aspect,topographic relief,vegetation richness,vegetation pattern and soil stability.Different VACs were observed in different regions in Yangshuo section.The relatively strong VAC was found in the regions of Lijiang River scenic spots,Ocean Mountain Reserve,Jianqiaoling Reserve,Dayuan Forest Farm and Yangshuo National Forest Park in the Yangshuo section.Different evaluation factors presented different impacts on VAC with varying degrees.In terms of natural and geographical environmental factors,the main aspect was vegetation richness.The area of plant community and the composition of vegetation structure played a leading role in the level of landscape VAC.Evaluation of landscape VAC can guide relevant government departments to make more effective landscape planning and development decisions,and provide an important basis for landscape protection,planning and construction in Yangshuo section of Lijiang River Basin.