Abstract: Taking Platycladus orientalis stands in the farm as research object, the characteristics of selected stands were investigated, and the physical and chemical properties of fuels were measured by tests; the plots were classified into several major types by systematic clustering; the BehavePlus software was used to customize fuel model, and then the effect of different wind speed, slope and fuel moisture on surface fire behavior characteristics of Platycladus orientalis stands and the transition ratio of different types of sample plots were investigated. The results showed that through systematic clustering, the Platycladus orientalis stands were divided into three types, and the stand factors of different types differed greatly; surface fire spread rate, fireline intensity and flame length were significantly positively correlated with 10 m wind speed and slope, and negatively correlated with fuel moisture, and heat productivity per unit area was negatively correlated with fuel moisture; the transition ratio and 10 m wind speed were significantly positively correlated, while negatively correlated with fuel moisture. In this paper, the potential surface fire behavior and transition ratio from surface fire to crown fire of different types of Platycladus orientalisstands differed greatly, which could provide a scientific basis for forest fire prevention and suppression and effective allocation of fire prevention resources in the study area.

Key words: Beijing Xishan Forest Farm, platycladus orientalis, forest fire, forest fire behavior