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从林分的时空角度入手 ,着重分析了与林火发生密切相关的林分因子 :不同林分、林龄、郁闭度。它们随时间的推移导致森林火灾危险性的变化 ,其一般规律是 :中郁闭度林分 ,年龄增加、郁闭度增加 ,林木枝下高增加快 ,从而地表火发生率降低 ,树冠火危险性增大 ;长期未郁闭的疏林 ,地表火危险长期存在 ,林分生产力低 ;灌木、草坡是地表火发生率最高 ,生产力最低的类型。所以 ,根据不同分区林分特点提出了合理的营林防火措施
From the point of view of space and time, this paper mainly analyzes the stand factors closely related to forest fire: different stand, stand age and canopy density. They change the risk of forest fires over time. The general rule is: Middle forest canopy density, increased age, canopy density, increased rapid increase of forest tree branches, resulting in a lower incidence of surface fires and a risk of crown fire There is long-term existence of surface fire hazard, low stand productivity, and shrubs and slopes are the types with the highest incidence of surface fire and the lowest productivity. Therefore, according to the characteristics of the different sub-forest stands a reasonable forest fire prevention measures