Hotspots from Satellite Monitoring and Forest Fire Weather Index Analysis for Southwest China

TIAN Xiao-rui; ZHAO Feng-jun; SHU Li-fu; WANG Ming-yu

Data of the hotspots in 2005—2007 and related information were provided by Forest Fire Monitoring Center of State Forestry Administration. Each component index of Forest Fire Weather Index (FWI) system was calculated base on the daily observation data of thirty-four weather stations in the key research areas. The results showed the hotspots in 2005—2007 were mainly distributed in Yunnan, Guangxi and south-western Guizhou, in which 44.6 percent of the hotspots might be caused by wildfires. The fires occurred in grassland, scrubland, forest and the other lands, which included prescribed burning. A large number of fires used for agriculture distributed in southwestern and southern Yunnan Province, which accounted for 30.1 percent of all hotspots. Fire occurred mainly in the period of November to May, in which the fires in January to May accounted for 77.6 percent of all hotspots in southwestern China. Forest fires mainly occurred in eastern and northwestern Yunnan, southeastern Guizhou and most parts of Guangxi. The number of hotspots was closely related to the changes of humus moisture code (DMC) and drought code (DC) of the region. In fire seasons, there were high DMC and DC values and much more hotspots and wildfires. There was a significant correlation between FWI value and the number of hotspots, which indicated that FWI system could be applied to the southwestern China. Component indexes of FWI system were good indicators for the fires danger rating. Based on FWI system component indexes of the kew research area, the paper defined the forest fire danger rating and their corresponding threshold of all component indexes. FWI ranges for low, moderate, high, very high, and extreme fire danger classes were created as follows: 0 - 1.2,1.3 - 5.0,5.1 - 12.0,12.1 - 25.0,25.1+. And the number of days with each fire danger rating class accounted for separately 41.0%, 23.6%, 21.8%, 11.2% and 2.4% respectively. To strengthen the fire sources management was an important and effective measure to reduce forest fires, since there were lots of man-made fire source and fires for agricultural use.

1. Research Institute of Forest Ecology, Environment and Protection,Chinese Academy of Forestry, Key Laboratory of Forest Protection,State Forestry Administration, Beijing 100091, China

Abstract: Data of the hotspots in 2005—2007 and related information were provided by Forest Fire Monitoring Center of State Forestry Administration. Each component index of Forest Fire Weather Index (FWI) system was calculated base on the daily observation data of thirty-four weather stations in the key research areas. The results showed the hotspots in 2005—2007 were mainly distributed in Yunnan, Guangxi and south-western Guizhou, in which 44.6 percent of the hotspots might be caused by wildfires. The fires occurred in grassland, scrubland, forest and the other lands, which included prescribed burning. A large number of fires used for agriculture distributed in southwestern and southern Yunnan Province, which accounted for 30.1 percent of all hotspots. Fire occurred mainly in the period of November to May, in which the fires in January to May accounted for 77.6 percent of all hotspots in southwestern China. Forest fires mainly occurred in eastern and northwestern Yunnan, southeastern Guizhou and most parts of Guangxi. The number of hotspots was closely related to the changes of humus moisture code (DMC) and drought code (DC) of the region. In fire seasons, there were high DMC and DC values and much more hotspots and wildfires. There was a significant correlation between FWI value and the number of hotspots, which indicated that FWI system could be applied to the southwestern China. Component indexes of FWI system were good indicators for the fires danger rating. Based on FWI system component indexes of the kew research area, the paper defined the forest fire danger rating and their corresponding threshold of all component indexes. FWI ranges for low, moderate, high, very high, and extreme fire danger classes were created as follows: 0 - 1.2,1.3 - 5.0,5.1 - 12.0,12.1 - 25.0,25.1+. And the number of days with each fire danger rating class accounted for separately 41.0%, 23.6%, 21.8%, 11.2% and 2.4% respectively. To strengthen the fire sources management was an important and effective measure to reduce forest fires, since there were lots of man-made fire source and fires for agricultural use.

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Hotspots from Satellite Monitoring and Forest Fire Weather Index Analysis for Southwest China

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