Study On The Effect Of Root Rot Of Korean Pine In Heihe City On The Combustion Of Its Trunk

Pinus koraiensis sieb.et Zucc is one of the most important tree species with great ecological value in northeast Asia.Korean pine root rot disease is by armillaria(Arimillariella mellea),the main symptoms for plant growth,sparse canopy,stem base late swelling associated with fat,which makes the wood composition change,on forest growth and forest health caused great harm,diseased trees show is more flammable,stand in greater risk of forest fires.Based on Korean pine plantation in Heihe city in Heilongjiang province as the research object,selecting typical forest disease,because of Korean pine root rot disease illness parts mainly in dry base and root,main reason of Korean pine trunk from a serious disease,light disease and disease-free trunk samples respectively,and in accordance with the conditions respectively on the trunk is divided into 3 three parts namely,tree roots,base of the tree,the tree cadres.The organic solvent extraction method was used to determine the content of Korean pine oil,the component content of Korean pine was determined by referring to the national industry standard,and the combustion property of Korean pine was determined by cone calorimeter.The difference was analyzed based on statistical software.The specific results were as follows:1.root rot disease of Korean pine moisture content,ash content,organic solvent extraction and alkali content of extract and the content of cellulose,lignin has a different degree of influence,the serious illness of Korean pine and light diseases of Korean pine three parts of the moisture content are lower than no Korean pine,moisture content is the direct factors influencing the combustion rate,without burning,sick of Korean pine burning speed;The ash content in the three parts of seriously diseased Korean pine was the lowest,which were 0.24%,0.15%and 0.24%respectively.The ash content was one of the factors affecting the heat release of combustible materials.Extract has a significant contribution to the combustion of forest combustibles,and it is also one of the factors affecting the heat release of combustibles.The contents of organic solvent extract and alkali extract in diseased red pine trees are high,and the decay degree of red pine trees is greatly increased.The cellulose content in three parts of seriously sick Korean pine was significantly lower than that of mild and non-sick Korean pine.However,the total cellulose content of light diseased Korean pine is slightly lower than that of non-diseased Korean pine,which has a good flame retardant effect.The content of diseased red pine is lower than that of disease-free Korean pine,and lignin is the main carrier of flameless combustion.2.The grease percentage of seriously and lightly diseased Korean pine was 7.83%and 2.5%,respectively,nearly 6%and 2%higher than that of non-diseased Korean pine,respectively.Root rot significantly increased the grease content in the diseased red pine,promoting its development into flammable forest.3.The ignition time of the three parts of seriously ill Korean pine was 16s,10s and 14s,which was nearly 8s shorter than that of the three parts of the non-diseased Korean pine.The peak heat release rate(HRR)of Korean pine in different parts showed that the average heat release amount of the three parts of seriously ill Korean pine was 154 kW/m2,while the peak value of mildly ill and disease-free Korean pine was 125 kW/m2 and 112 kW/m2.The heat release amount of seriously ill Korean pine was higher than that of mildly ill and disease-free Korean pine.The analysis of effective heat of combustion(EHC)also showed that seriously sick Korean pine was the most inflammable and released the greatest amount of heat,while non-diseased Korean pine and mild Korean pine burned more slowly.The fire occurrence index(FPI)of different parts of Korean pine indicates that the fire resistance of the non-diseased Korean pine is strong,while the fire resistance of the diseased Korean pine is weak,that is,it is flammable tree,if there is a fire,it is easy to lead to the spread of fire,which is related to the high amount of oil and other combustible substances in the red pine.