地被可燃物与林型火险等级划分

Study on forest fuel and classification of fire disk level of stand type

采用模糊聚类分析方法 ,以辽宁省各地区常见的主要林型 37个为聚类单元 ,选取各聚类单元中的林火发生频度、地被可燃物载量、可燃物含水率、凋落物层厚度、可燃物燃烧蔓延速度作为聚类因子 ,进行全省林型火险等级划分。聚类分析结果划分出了不同火险级别 (Ⅰ～Ⅳ )林型 ,并详细列出Ⅰ、Ⅱ。

The fire risk in different stand types in Liaoning were classified by using fuzzy cluster analysis,in the classification 37 kinds of main stand types were regard as cluster unit,in each cluster unit those cluster factors as following were selected:the occurrence frequency of stand fire,the amount of forest fuel,the moisture content of forest fuel,the thickness of litter layer,the velocity of burning and spreading of forest fuel.Stand types of different level fire risk were divided into four grade(Ⅰ～Ⅳ),The distribution of stand types in Ⅰ～Ⅲ grade over Liaoning province were listed.