过火林木受害与火环境变化的研究  

Study on the Harm of Fired Forest and the Change of Fire Envionment

作　　者：杨美和[1] 高颖仪[1] 许忠学[2] 陈兴海 杨相军 高文涛 鄂明生[2] 

机构地区：[1]吉林林学院林学系 [2]吉林林学院实验林场

出　　处：《吉林林学院学报》1992年第2期29-38,共10页

摘　　要：林地过火后林木受害与火环境变化如何是关系到"火害"与"火利"的评价问题。本文通过实地调查得出:林木受害轻重取决于火强度、林分类型、林木径级等。随着火强度加大,受害加重;针叶林尤其针叶幼林受害率大于阔叶林:径级越大,受害越轻;针叶树以长白落叶松抗火性最佳,阔叶树以硬阔叶树抗火性最优。过火林地火环境(气象条件)变化最明显的是地温增高,湿度减小,风速加大;贴地层空气不稳定性增大,湍流交换加速,导致过火针叶幼林和柞树纯林再度发生火灾的潜在危险较阔叶混交林大。The harm of fired forest and change of fire enviro- nment is related to the evulation of"both of gains and losses of fire." The investigation shown that the harm degree depends on fire dens- ity,forest type,tree size etc.The harm rate of young conifer trees is more than that of broad—leaf trees.The fire resistants of larch and hard broad—leaf trees are the highest.The fire environment varies that temperature increases,humidity decreases,wind stren- gthens,the mobility of atomsphere close ground increases and exch- angment of swift flow speeds up.They cause that refire potentials of young conifer and oak trees enlarge.

关 键 词：火生态 火环境 森林防火 

分 类 号：S7[农业科学—林学]