Temporal And Spatial Distribution Characteristics Of Forest Fires Caused By Three Main Fire Sources In Daxing’ Anling,Inner Mongolia

According to the historical data of forest fires,the temporal and spatial patterns of lightning fires,smoking fires and agricultural fires in Greater Khingan Mountains of Inner Mongolia were studied to provide scientific basis for fire management and forest fire prevention.Based on the data of forest fires in Greater Khingan Mountains of Inner Mongolia from1981 to 2020,the temporal variation characteristics of three fire sources were analyzed respectively.Trend analysis was performed by MK mutation test.The spatial distribution patterns of three fire sources were analyzed by multi-distance spatial clustering analysis and kernel density analysis.Through the collinearity test of four meteorological factors,the correlation between meteorological factors and forest fire occurrence was explored.The distribution of forest fires under topographic conditions was analyzed by Arc Map.The radiation range of lightning fire in Greater Khingan Mountains of Inner Mongolia from 1981 to 2020 is the widest,and smoking fire and agricultural fire are relatively concentrated.The occurrence frequency and harm of three kinds of fire sources(except lightning fire frequency is increasing)are decreasing.Lightning fires occur frequently in summer,most active in May,June and July,and most frequently in 0 : 00-0 : 59,and most harmful in 4 : 00-4 : 59.Smoking fires and agricultural fires occur frequently in spring,most active in April and May,and most frequently in 8 : 00-19 : 59.The key prevention areas of lightning fire are the northern original forest area,Mangui,Alongshan,Moerdaoga,Genhe,Ganhe,Keyihe and Iturihe Forestry Bureau.The key prevention areas of smoking fire and agricultural fire are Dayangshu and Bilahe Forestry Bureau.With the gradual strengthening of fire source control,forest fire monitoring and fighting capacity in Daxing ’anling,Inner Mongolia,the total area of fires caused by the three fire sources in recent years has decreased significantly compared with that before;forest fires caused by the three fire sources mostly occurred in spring and summer.The forest fires caused by the three fire sources were significantly clustered in space.The forest fires caused by the three fire sources were significantly correlated with temperature.Forest fires mostly occur in gentle slopes and low altitude areas.