森林燃烧环网的研究

STUDYING ON NETWORK OF FOREST BURNING LINKS

本文在森林燃烧环研究的基础上,将林火行为的两大主要特征(着火蔓延和燃烧强度)分为不同的等级,即着火蔓延序列分为A:难燃、蔓延缓慢;B:可燃、蔓延中等;C:易燃、蔓延快三级,把燃烧强度序列分为Ⅰ:轻度燃烧;Ⅱ:中度燃烧;Ⅲ高度燃烧;Ⅳ:强度燃烧四级,然后以着火蔓延序列为纵向,以燃烧强度序列为横向,构成森林燃烧环网,以此来研究各燃烧环之间的相互关系,分布规律及变型,影响森林燃烧的主要因子是可燃物类型、地形、立地条件、可燃物数量和火灾种类,研究它们在环网上的分布和作用,可为林火管理和估测各燃烧环的火行为特征提供依据。

Based on the research of the Forest Burning Links published in thc Journal of Northeast Forestry University in 1987, this paper continues to study thc theory of forest burning. Fire behaviour has been divided into two important parts in this paper. One is the combustibility and fire spread, and the other is the fire intensity. The combustibility and fire spread have been divided into three grades as the following: A: to burn difficultly and spread slowly; B: to burn possibly and burn in middle degree; C: to burn easily and spread fast. The burning degrees of fire have been divided into four as the following: Ⅰ: light burning; Ⅱ: medium burning; Ⅲ: intense burning; Ⅳ: severe burning. The part of combustibility and fire spread can be put as ordinate and the post of fire intensity can be put as abscissa. Then the network of forest burning links has been formed by twelvc forest burning links. In the network, the relationship, the law of distribution and the variation of different forest burning links can be shown clearly. The studies of the distribution and effect of fuel types, topography, site and fire kinds in the network can provide the basic theory for fire management.