Distribution Of Forest Fuel And Classification Of Fire Risk In Mount Tai

Forest fire poses a huge threat to forest resources,the ecological environment,and people’s lives and properties,especially large and extremely large forest fires.Therefore,it is very important to prevent and forecast forest fires,which can reduce the occurrence of forest fires to a certain extent,achieve the purpose of reducing forest fire losses and protecting forest resources.The direction of forest fire risk forecasting in the future is how to predict the occurrence of forest fires more accurately on a smaller scale is conducive to focusing on forest stands with high fire risk in a smaller area,deploying fire protection equipment and fire protection forces,and achieving precise fire prevention.After investigating the combustibles of Mount Tai,the forest area of Mount Tai was divided into 6 forest areas,that is Quercus acutissima Platycladus orientalis mixed forest.,Robinia pseudoacacia pure forest,Platycladus orientalis pure forest,Quercus acutissima Carruth pure forest,Pinus tabulaeformis pure forest,and Pinus densiflora Sieb forest.In representative sample plots,the load of combustibles was investigated by sample methods,and the distribution characteristics of combustibles in each forest stand were analyzed.Use DW-02 ignition temperature measuring instrument to measure the ignition point of combustibles,and use ZDHW-6000 microcomputer automatic calorimeter to measure the calorific value of combustibles.Arc GIS is used to calculate the slope,aspect,and altitude distribution of each forest,and the fire risk factor is assigned and calculated according to the analytic hierarchy process,and the fire risk level is divided.This experiment uses a combination of qualitative and quantitative methods to study the distribution of forest combustibles and the classification of fire hazards in the forest area of Mount Tai in my country,providing scientific data support and theoretical basis for forest fire early warning,forecasting and firefighting.The specific research results include the following aspects:(1)Pinus tabulaeformis pure forest in Mount Tai,which accounted for about 60%of the forest area in it,Robinia pseudoacacia pure forest accounted for approximately 14%of the forest area in Mount Tai,Platycladus oriental were pure forest accounted for about 8%of Mount Tai,and Pinus densiflora Sieb.pure forest were approximately 5%of the this area.Quercus acutissima Carruth pure forest accounted for about 9%of this forest area,and the mixed forest of Quercus acutissima Carruth&Platycladus oriental were about 4%of the forest area in Mount Tai.The forest area of Mount Tai was dominated by highly combustible tree species.(2)The surface combustibles of each forest stand have a certain spatial correlation.Among them,the Robinia pseudoacacia forest has the highest spatial correlation,followed by Pinus densiflora Sieb.forest,Platycladus orientalis,Quercus acutissima Platycladus orientalis mixed forest is the lowest.The spatial correlation degree of surface combustible matter of Quercus acutissima Platycladus orientalis mixed forest.is between 25%and 75%,and the spatial correlation between litter and humus is relatively similar.The distribution of various forest subtrams and humus spatial distribution is plaque,The plaque distribution of Quercus acutissima Platycladus orientalis mixed forest.Pinus tabulaeformis,and Platycladus orientalis is extremely obvious while that of Pinus densiflora Sieb is more obvious,and Robinia pseudoacacia and Quercus acutissima are not obvious.(3)The burning loads of each forest have the same as:9.53 t/hm~2 of the Platycladus orientalis pure forest.The Pinus densiflora Sieb.is 12.84 t/hm~2,and the Pinus densiflora Sieb forest is 21.02 t/hm~2,and the Robinia pseudoacacia forest is 9.56 t/hm~2.Quercus acutissima Carruth pure forest is 14.19 t/hm~2 and the Quercus acutissima Platycladus orientalis mixed forest is 13.9 t/hm~2.(4)According to the fire risk factors of different forest areas(slope,aspect,altitude,combustible load,ignition point,calorific value,moisture content,spatial correlation),develop fire risk zoning standards,and the Mount Tai forest area was divided into five fire risk levels,fire risk area I,low fire risk area II.Medium fire risk area III,high fire risk area IV,and extremely high fire risk area V.Among them,fire risk area I accounted for 22.18%,fire risk area II accounted for 11.10%,fire risk area III accounted for 36.36%,fire risk area IV accounted for 15.98%,fire risk area V accounted for 14.38%,Among them,class III fire risk areas account for the highest proportion,and medium-risk areas have the largest area.