Study On The Fire-resistance Comprehensive Analysis And Control Of Chinese Pine Forest In Beijing

The forest fire-resistance is the ability of resisting and tolerating forest fire for the whole forest community,especially the ability of resisting the high intensity crown fire.The study of forest fire-resistance can forecast of forest fire occurrence,kind,and intensity,which can provide theoretical basis to preventing of forest fire and can guide people to establishing of management measures to improve the fire-resistance and to decrease forest fire danger.This paper did research on the Chinese pine forest which has the same ecological function and factors in Beijing area.Through comprehensive analysis of the main tree species' fire-resistance,fuel and combustible fuel loading and it's combustion potential energy,and the vertical distribution of fuel, we conducted the fire-resistance of Chinese pine forest to different kinds of forest fire,and put forward some regulative measures to enhance the forest fire-resistance.Applying the principal components analytic method to research tree species fire-resistance,but comparative analysis method to research fuel and combustible fuel loading,combustion potential energy and vertical distribution.By analyzing we conclude that:(1) Based on the order of main tree species fire-resistance,we can see that the fire-resistance of Pinus tabulaeformis is the weakest,so the fire-resistance of Chinese pine forest mainly make up of Pinus tabulaeformis is weak.(2) Through the analysis of forest fuel load and the potential energy of combustion,we can see the fire-resistance of Chinese pine forest is weak;Further analysis of the fuel load and combustion potential energy of ground layer,herbaceous layer,shrub layer and arborous layer,we can see crown fire occurred is not easy,so the forest has strong fire-resistance to crown fire.But a large area of surface and underground fire are likely to occur,so the forest's fire-resistance to the surface and underground fire is relatively weak.(3) According to the vertical distribution of fuel,we got the same result that the Chinese pine forest has weak fire-resistance to the underground fire;The surface fire occur easily,and it may spread to large area,so the forest's fire-resistance to the surface fire is weak;But the surface fire is not easyly convert to crown fire,even if the crown is kindled,spreading is not easy,so the forest's crown fire resistance is strong.(4) According to the comprehensive analysis of forest fire-resistance,we must take some management measures to Pinus tabulaeformis and the fuel of ground layer and shrub layer to improve the forest fire-resistance.The main measures to Pinus tabulaeformis are pruning and protecting of the basal part of trunk;The main measures to the fuel of ground layer and shrub layer are cleaning of random property and selectively cutting of shrubs.