基于RS和GIS的香格里拉森林火险等级区划

以三江并流核心区香格里拉市为研究对象,以TM影像、森林资源调查数据、林相图和DEM为信息源,在分析香格里拉地区森林火险因子基础上,选取植被类型、坡向、坡度、海拔和离居民点远近作为主要林火等级区划因子。借助RS和GIS技术并采用因子加权叠置法,对研究区森林火险情况进行了定量评价,将火险等级分为低、中、高3类。结果表明:研究区低、中、高火险区面积分别占研究区总面积的12.96%,47.85%,38.87%,中、高火险区比重较大,森林防火任务较重。高火险区大部分位于易燃树种区和居民点密集区域,树种燃烧性和人为因素是影响火灾的重要因子,研究结果可为相关部门森林防火提供技术支持。

Study on Forest Fire Risk Zone Mapping for Shangri-La Based on RS and GIS

In the present study,Shangri-la,which is the core of three parallel rivers,was taken as a research area and TM images,forest resources survey data,stock state map and DEM selected as the sources of intelligence.On the basis of analyzing the forest fire risk factor of Shangri-La,the forest fire risk in Shangri-La area was quantified by the factors including vegetation type,aspect,slope,altitude and settlement buffer area.The circumstances of forest fire risk were quantified by the RS,GIS and factor-weights union method,the investigating area were divided into low,moderate and high fire danger zones.The investigating results show that:the low,moderate,and high fire danger zones take up 12.96%,47.85%,and 38.87% of the total investigating area respectively,the moderate and high fire danger zones hold a strikingly high proportion,indicating that the forest Forest fire task is heavy.Most of high fire danger zones are flammable tree area and the dense populated residential areas.Tree species combustibility and human factors are the important factors of the forest fire.The results will provide technical support to the releated departments of forest fire control.