[Dynamics of forest fire weather indices in Tahe County of Great Xing' an Mountains region, Heilongjiang Province].

Based on the 1974-2008 forest fire and meteorological data in Tahe County of Great Xing' an Mountains region, and with the help of Canadian Forest Fire Weather Index System (CFFWIS), this paper qualitatively and quantitatively analyzed the dynamics of forest fire weather indices in the region. In 1974-2008, the mean annual fire occurrence in the region showed an increasing trend, and the increment in 2000-2008 was 72.2%, compared with that in 1974-1999. The fuel moisture codes, fire behavior indices, and fire severity indices in 1974-2008 had an overall increasing trend, which was more evident with time extended. In the future, the probability of forest fire occurrence in the region would be increasing, fuels would be getting drier, fire intensity would be increased, fire weather would be more serious, and fire control would be more difficult. Therefore, more efforts should be made to improve the capability of forest fire control, especially in summer. As a fundamental technique, prescribed burning should be applied to reduce the fuel load. From this doing, the probability of fire occurrence and the fire potential intensity could be reduced.