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利用10cm高空间分辨率航空遥感影像,在森林资源二类调查的基础上,获取研究区的可燃物类型及其特征信息;利用1∶10 000地形图获取地形因子信息。在此基础之上,通过加权叠置法计算火险指数,并将研究区划分为Ⅰ级(没有危险)、Ⅱ级(低度危险)、Ⅲ级(中度危险)、Ⅳ级(高度危险)、Ⅴ级(极度危险)等5个火险区划。结果表明:Ⅰ级火险区面积最小,占研究区总面积3.98%;Ⅱ级火险区面积最大,占32.25%;Ⅲ级火险区面积占21.05%;Ⅳ级和Ⅴ级火险区面积分别占22.14%和20.58%,两者之和较大,占研究区总面积的42.72%,研究区防火任务艰巨。研究区内可燃物类型对火险等级划分起重要作用,其中麻栎和茶树在森林防火工作中发挥重要作用;松树、竹林和荒草地是防火的重点。
Based on the second type of forest resources survey, the type and the characteristic information of combustibles in the study area were obtained by aerial remote sensing image of 10cm high spatial resolution. The topographical factor information was obtained by using 1:10 000 topographic maps. On this basis, the fire insurance index was calculated by weighted stacking method, and the research area was divided into Ⅰ grade (no danger), Ⅱ (low risk), Ⅲ (moderate danger), Ⅳ (high risk) , Ⅴ level (extremely dangerous) and other five fire zoning. The results show that the first-class fire danger zone has the smallest area, accounting for 3.98% of the total area under study. The second-level fire danger zone has the largest area accounting for 32.25%, the third-level fire danger zone accounting for 21.05%, and the fourth and fifth grade fire danger zones accounting for 22.14% And 20.58% respectively, accounting for 42.72% of the total area of the study area. The task of fire prevention in the study area is arduous. The types of combustibles in the study area play an important role in the classification of fire insurance. Quercus acutissima and tea tree play an important role in forest fire prevention. Pine, bamboo and grassland are the key points of fire prevention.