Zoning And Assessment Of Forest Drought Risk In Hulunbeier Area

Drought is the most widespread meteorological disaster with the largest number of occurrences and most frequent occurrences.Due to the frequent occurrence of extreme climatic events in recent years,coupled with human factors such as excessive tree felling and excessive waste of water resources,the number of forests has increased.Due to drought reduction.This paper takes Hulun Buir as the research area,selects the meteorological index,analyzes the characteristics of the spatial and temporal distribution of drought,selects the forest index and social economic indicators,etc.Based on the drought risk theory,the forest drought risk is classified and evaluated.The conclusions are as follows:(1)Drought in Hulunbeier region is sensitive to short-term precipitation response,which is characterized by high frequency and low intensity.The frequency of winter drought in seasonal drought is high and the intensity of autumn drought is high;the dry season in dry and wet season is strong and wet.The frequency of the season is high;the annual inter-annual drought is characterized by the central region being higher than the eastern one,and the drought in the east is gradually higher than that in the west.(2)From the spatial distribution of different levels of drought frequencies,it can be concluded that the areas with higher frequencies of extreme drought are located in the eastern part of Chenbaerqi Banner,Hailar District,Ewenki Autonomous Banner,Xinbalhuzuo Banner,and south of Yakeshi City.It can be seen from the spatial distribution of drought intensity in seasonal and dry-humid seasons in Lantun City,southern Orkhon Autonomous Banner and western Arong Banner that the spring drought intensity decreases from south to north;summer drought intensity decreases from west to east;autumn drought intensity from east to east Decrease in the west;the winter drought intensity is higher in the east and west than in the middle;the drought intensity in the dry season declines from northeast to southwest;in the wet season,the drought intensity decreases from west to east.(3)The areas with high risk of forest drought disaster hazards are distributed in Xinbalhuyouqi,eastern Orkhon Autonomous Banner and northeast of Moqi;the areas with high environmental sensitivity to catastrophic disaster include the northern part of Ergun City and its roots.River City,most of Yakeshi City,east of Ewenki Autonomous Banner,east of New Barbara Zuoqi,and west of Zaltan City;areas with high vulnerability to disaster-afflicted bodies are concentrated in the northern part of Hulun Buir,including the northern part of Ergun City.Most of Genhe City,the west of the Oroqen Autonomous Banner,and the middle of the Arong Banner;areas with strong ability to prevent and mitigate disasters are distributed in the southeast of Yakeshi,Arong Banner and east Zaltan.The heavy risk areas of forest drought are located in the north and west of Hulunbeier.The extremely severe risk areas are located in the westernmost and eastern parts of Hulunbeier.Looking at the overall situation,the risk of forest drought in the Hulunbeier region is high in the east and west and low in the south-central region.(4)The area of light risk accounted for 6.81% of the total area,including Hailar District,Yakeshi City,and Zallamon City;medium risk area accounted for 24.52% of the total area,including Chenbahuqi,Ewenki Autonomous Prefecture and Arong Banner;The area of severe risk accounted for 59.83% of the total area,including Ergun City,Genhe City,Manzhouli City,and Xinbalhuzuo Banner.The area with extremely severe risk accounted for 8.84% of the total area,including New Barhu Right Banner,the Oron Autonomous Banner and Mo Flag.