Study On The Impacts Of Climate Change Of Forest Fires In Daxing' Anling Mountains

By using meteorological data from 1972 to 2005 and forest fires data from 1965 to 2005 in Daxing'anling Mountains,climate change and forest fires distribution pattern were analyzed,and climate change impactd on forest fires was studied.Studied climate change from 1972 to 2005 in Daxing'anling Mountains,the major conclusions of the study are as follows:The climate was developed to become warmer and drier,espaciouly in summer.The annual average temperature has been increasing obviously in recent 34 years,temperature jumps appears around 1988.Since entering the 21st century,the temperature continued to increase,espaciouly in 2002 and 2005 years.The precipitation and relative humidity have great fluctuation and take on a slight increase trend.In the late 1990's, the precipitation was more abundant,relative humidity was greater.From 1999 to 2005,the precipitation and relative humidity were reduced significantly.It was abnormal less rain in 2002 and 2005 and the average annual relative humidity reached the lowest level in 2005.Forest fires distribution pattern was analyzed from 1965 to 2005,the number of forest fires and forest fires area show obvious stage in Daxing'anling Mountains.The number of forest fires and forest fires area were less in 1990's,after 2000,they increased significantly, the fire disasters were abnormal serious.The number of lightning fire and fire areas in summer were the largest increasing,after 2000,average annual number of lightning fires were 38 times, it was more than 12 times of average lightning fire from 1972 to 1999.Entered the 21st century, with summer drought,forest fires have increased gradually,August is not absolute security,it should be attented.The length of forest fire season had great fluctuation.From the mid-1970s to the mid-1980s,the length of forest fire season was more.Due to the strengthening of forest fire management,the length of forest fire season deduced in 1990's.The days of forest fires were more increasing after 2000 than 1990's.The late of forest fire season had postponed about 10 days.The increase of the length of forest fire season means that forest fire situation will be more serious.Analyzing the relation of forest fires and meteorological factors,forest fires number were separately correlated with the precipitation and relative humidity.Smmer drought was the worst,and the most of forest fires number was in summer.Use humid factor can predict the occurrence of lightning fires.Comparisoin of the relationship between forest fires numbers of different regions at different stages and the meteorological factors,the results showed that it was the most serious warmer region in Jiagedaqi,and the rate of increase of forest fires number was the largest.Analysis of the relationship between El Ni(?)o and forest fires,the impact of El Ni(?)o on the forest fires occasion was notable.Forest fires araes increased significantly at El Nino year and the following year.