Research On Flammability Of Major Forest And Fuel Loading Of Platycladus Orientalis And Pinus Tablaeformis Forest In Beijing Xishan Forest

Forest fires not only pose a great threat to forest health,but also affect the sustainable development of forest ecosystems.Therefore,it is of great significance to reduce the incidence of forest fires through scientific methods,and to maintain the healthy and sustainable development of forests,as well as to reduce economic losses.Forest fire is the foundation of forest burning phenomenon,the characteristics can be used to describe the forest fire;and forest fuel is an important material basis of forest fire behavior,therefore,the research of forest and forest fuel combustion characteristics of forest fire behavior and the occurrence of forest fire spread good management can solve the security the problem caused by forest fires fundamentally,improve forest health.Through the study on the investigation of Beijing Xishan Forest Farm of Wat Chayamangkalaram branch of main forest types in natural conditions and the distribution of forest,forest farm of main forest combustibility is studied and analyzed,and the main forest,coniferous forest,Pinus tabulaeformis and Platycladus of the fuel load characteristics research and analysis.Selected the 10 pieces of sample area as the research object(2 side community slightly,2 blocks of Berlin,2 mixed forest of acacia,2 blocks of needle,2 pieces of broadleaf mixed forest),based on the standard ground survey,the surface dead fuel as the research object,with dead fuel load,moisture content and comprehensive properties for the analysis of the basis,in combination with the practical situation of the latest research results at home and abroad,the forest farm and sample plot survey,respectively,to discuss and contrast the combustibility of different forest types,and rank.On the basis of the pass area breakout in topographic map,the use of GIS map pass area breakout forest combustibility level distribution.Some reference opinions for subject research,provide the basis for fuel regulation,at the same time,it has certain guiding significance for forest fire prevention work.The results show that:(1)the forest comboustibles combustion characteristics,biological and ecological characteristics as the analysis basis,the Wat Chayamangkalaram main forest combustibility breakout is classified as flammable(Berlin pine,side),combustible(conifer),flame retardant(broad-leaved forest)three grades.Among them,the majority of Wat Chayamangkalaram breakout areas of forest combustible flammable and combustible combustible belongs to the class.When there is a fire,the combustible area is large,prone to large area fire spread.(2)the distribution characteristics of combustible matter in main forest.The main contents of the fuel in the Platycladus orientalis plantation were 0-3m and 3-4m.Among them,respectively in the fuel load in the 0-3m layer:536g/m2,main fuel type:surface litter and shrub fuel;in the 3-4m layer,the total load is 460.5g/m2 main fuel for trees and trees live branch fuel combustible dead branches.(3)in the vertical distribution of combustible matter in Chinese pine forest,the fuel is mainly distributed in 0-3m and 4-5m layers.Among them,the fuel load in the 0-3m is 775.2g/m2,mainly by the surface of combustible and combustible composition of the Bush,3-4m load is the smallest,from the tree branches combustible composition.The 4-8M is mainly composed of the living tree fuel,and the load is reduced gradually.According to the distribution of the vertical fuel,the vertical fuel distribution is not uniform,and the fuel load is small in 3-4m.(4)the stand density of Platycladus orientalis forest was,the average DBH was 13.16cm,the average tree height was 6.21m,and the basal area per hectare was 17.79/hm2(M2).In the tree layer,the dominant species in the sample plots were Platycladus orientalis.The Shannon-Wiener index of shrub layer was 1.69,while the Shannon-Wiener index was.The density of Berlin was larger and the stand structure was simple and the productivity was low.The density of Pinus tabulaeformis forest is too large and the structure is simple.The average density of Pinus tabulaeformis stands was 883 Hm2,the average DBH was 14.47cm,the average height of trees was 7.83m.Stand basal area was 15.00m2.Hm2,stand volume was 66.62 m3/hm-2.The species diversity of arbor layer was low,and the species diversity of shrub layer was higher.Based on the distribution characteristics of Beijing Xishan Forest main combustible materials,analysis of the Beijing Xishan Forest Forest fire risk,and for the Beijing Xishan Forest Fire in the theoretical research and practice of forest fire management daily provide guidance.