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After freezing snow disaster,stands of Pinus massoniana,Cunninghamia lanceolata. Liquidambar formosana,Cinnamomum camphora and Phyllostachys pubescens and new burned areas in Hunan Province were surveyed by setting field plots.Moisture content and fuel load were measured by sampling and fire behavior(such as rate of fire spread) was calculated.The results showed that fuel load got doubled instantly,fuel thickness enhanced,fuel continuity swelled and water content of fuel decreased as shrubs and herbs died after freezing snow disaster;the fuel load in the 7 plots varied from 12,23 to 50.26 t/ha;after freezing snow disasters,with fire environment changed,fire behavior of burned forest areas got extraordinaryly complex;the fire intensity was 1.5-9.0 MW/m,with average 3.5 MW/m; the fire spread rate was 111.67-972.71 m~2/min and the fire severity exceeded 50%.According to the above situations,it was suggested that the forests were at the risk of the conflagration.
After freezing snow disaster, stands of Pinus massoniana, Cunninghamia lanceolata. Liquidambar formosana, Cinnamomum camphora and Phyllostachys pubescens and new burned areas in Hunan Province were surveyed by setting field plots. Moisture content and fuel load were measured by sampling and fire behavior (such as as rate of fire spread) was calculated.The results showed that fuel load got doubled instantly, fuel thickness enhanced, fuel continuity swelled and water content of fuel decreased as shrubs and herbs died after freezing snow disaster; the fuel load in the 7 plots varied from 12,23 to 50,26 t / ha; after freezing snow disasters, with fire environment changed, fire behavior of burned forest areas got extraordinaryly complex; the fire intensity was 1.5-9.0 MW / m, with average 3.5 MW / m; rate was 111.67-972.71 m ~ 2 / min and the fire severity exceeded 50% .According to the above situations, it was suggested that the forests were at the risk of the conflagration.