Temporal and Spatial Distribution Characteristics of Forest Fires Caused by 3 Main Fire Sources in Daxing'an Mountains,Inner Mongolia
Based on the forest fire data in Daxing'an Mountains of Inner Mongolia from 1981 to 2020,the temporal variation characteristics of 3 fire sources were analyzed;trend analysis by MK mutation test;the spatial distribution patterns of 3 fire sources were analyzed by multi-distance spatial cluster analysis and kernel density analysis.The results showed the radiation range of lightning fire in Daxing'an Mountains of Inner Mongolia from 1981 to 2020 is the widest,and smoking fire and agricultural fire are relatively concentrated.The occurrence fre-quency and harm of 3 kinds of fire sources(except lightning fire frequency is increasing)are decreasing.Light-ning fires occur frequently in summer,most active in May,June and July,and most frequently in 00:00-0:59,and most harmful in 04:00-4:59.Smoking fires and agricultural fires occur frequently in spring,most active in April and May,and most frequently in 08:00-19:59.The key prevention areas of lightning fire are the north-ern original forest area,Mangui,Alongshan,Moerdaoga,Genhe,Ganhe,Keyihe and Yitulihe 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 extinguishing capacity in Daxing'an Moun-tains of Inner Mongolia,the total area of fire caused by the 3 fire sources in recent years has decreased signific-antly compared with the previous.Forest fires caused by the three fire sources mostly occurred in spring and sum-mer.The forest fires caused by the 3 fire sources were significantly clustered in space.
Daxing'an Mountains of Inner Mongoliaforest firefire sourcetemporal changespatial pattern
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