The Study On Forest Types Combustibility And Spatial Distribution Pattern In Habahe

Forest fire is the phenomenon of forest burning. the study of the type of forest combustibility and spatial distribution pattern,not only guiding significance for forest fire forecast,but also it may provide the theory basis for the prevention of forest fire,at the same time,it have the directing meaning for the measure establishment of fire protection according to different combustion type of fuel.This study use eight major forest types investigation in the Habahe county forest farm. collection surveys and experimental analysis the basic data and sample to different forest type about trees,bush,herbal,fuel load and forest factor .use the method of correlation analysis analyze the correlation of the heat of combustion,extractive content,ash content,moisture content and established the principal component equations,come to the integrated attribute value of combustible physical factor .According to the method of correlation analysis analyze the correlation of the surface fuel load and forest factor,and established the forecast model of the surface fuel load and forest factor .On this basis ,use the method of assignment to classification the different forest combustion type,and by GIS and Fragstats analyze the landscape pattern in the Habahe forest farm .find out the relation of flammability and landscape pattern. In this process, find out the following conclusions:(1) According to the method of correlation analysis analyze to the combustible matter physical and chemical factors,find out the heat of combustion and extractive content into a significant positive correlation,in the combustible matter the extractive content of the higher the heat of combustion higher;the ash content and extractive content is a negative correlation,the extractive content higher the ash content is lower;the ash content and heat of combustion is a negative correlation,the ash content of the lower the heat of combustion is higher.(2) In the Habahe forest farm the major trees is conifer,according to put in order and ranking to the different trees flammability composite indicator find out the order of this 8 major forest types:the mingled forest of Pinus sylvestris Loud. Mayr and Larix sibirica Ledeb. >the pure forest of Abies sibirica Ledeb. >the pure forest of Larix sibirica Ledeb. >the pure forest of Picia obovata Ldb. > the mingled forest of Abies sibirica Ledeb. And Larix sibirica Ledeb. >the pure forest of Populus tremula L. >the pure forest of Betula pendula Roth. >the mingled forest of Larix sibirica Ledeb. And Betula pendula Roth. And Populus tremula L. .(3) According to the method of correlation analysis analyzed the fule load and forest factors (grade,altitude,average tree height,average DBH,canopy density,average dead branches high ),and establishment the stepwise regression equation,find out that many forest factors impact the fule load,A single factor only impact a partial one-sided on the fuel load,in the study should be combined to study a number of factors.(4)The proportion of strong flame and flammability are most,anti-interference ability of the fire are worst,its stability and recovery capabilities after interference are worst in the baihaba operating forest area about the small-ban.the habahe operating forest area have stronger Anti-interference ability of the fire,stability and recovery capabilities after interference .