Occurrence Regularity Of Forest Fire In Guangxi And Its Correlation With Meteorological Factors

Based on the forest fire data,meteorological data and spatial data of Guangxi from 2011 to 2015,the causes of forest fires in Guangxi in the past five years were analyzed.The temporal and spatial distribution of forest fires and the relationship between forest fires and meteorological factors were studied.Statistical analysis software Spss19 and geographic information software Arcgis 10.2 were used to analyze the correlation of fire area,damage area and meteorological factors of forest fires.The regression equations of fire area,forest fire damage area and meteorological factors were constructed.The research is as follows:Study on the causes of forest fires:According to the statistics of the causes of forest fires one by one,man-made fire is the main cause of forest fires in Guangxi.99.08%of forest fires are caused by human beings.Generally speaking,the main reason for the forest fires in Guangxi is burning paper on the upper graves,followed by burning charcoal.As far as fire classification is concerned,the main cause of general forest fires is burning paper in the tombs,and the main cause of larger forest fires is burning coal.Study on the temporal regularity of forest fires:The forest fires occurred in different years,seasons,months and time periods were analyzed.In terms of interannual changes,except 2015,the occurrence of forest fires in Guangxi is more balanced and stable;in terms of seasonal changes,spring and winter are the high-incidence season of forest fires,and summer forest fires are the least;in terms of monthly changes,January,February,March,April,October and December are the high-incidence months of forest fires,April.The number of forest fires reached the peak of the whole year;from the time change,the time characteristics of forest fires in Guangxi were obvious,77.8%of the forest fires occurred at 11-18 o'clock,of which 14-15 o'clock occurred the most forest fires,0-6 o'clock was the low-incidence period of forest fires.Study on spatial distribution of forest fire:The forest fire situation in different administrative areas,altitude,vegetation and ethnic areas was analyzed.From the perspective of administrative region,Baise,Guilin,Hechi and Wuzhou are high incidence of forest fires,of which Baise has the most forest fires.Beihai and Fangcheng Port are low-risk areas of forest fires;from the altitude point of view,forest fires are high-risk areas of 0-200 meters.After the altitude reached 200 meters,with the elevation rising,the number of forest fires,the area of fire and the area affected by forest fires decreased sharply.In bad forest areas,pine and Eucalyptus are the main fire vegetation in Guangxi;from the perspective of development trend,there are fewer forest fires in central and southern Guangxi,and more forest fires in northern,Eastern and Western Guangxi.The relationship between meteorological factors and forest fire was studied.Forest fire under different temperature,relative humidity,precipitation and wind speed was analyzed.Forest fires occur most frequently at 24.1-32.0 C,46-64%relative humidity,or 2 m/s wind speed.Temperature and relative humidity were the significant meteorological factors affecting the fire area of forest fires.The regression equation Y=-0.439X 1-0.224X2+34.605 was fitted.Relative humidity is the meteorological factor which has significant influence on the affected area of forest fire.The regression equation Y =-0.012X + 2.948 is fitted.