@@ 森林地表枯死可燃物是森林燃烧的基础物质之一,直接影响着地表火行为发生的强度.承德县境内分布着大面积的人工针叶林,林下积蓄的枯枝落叶较多,发生地表火的危险性极高,因此,对影响潜在地表火行为的因子,即地表枯死可燃物的各类载量及含水率进行调查研究(Shan et al.,2002),从而实时掌握不同林分的潜在地表火行为状况,显得尤为重要.%The dead surface combustibles of artificial coniferous forests in Chengde were focused in this paper. Predicting models between fuel loading and the stand and landform factors, as well as between water ratio of combustibles and weather factors were established with a regression analysis method. The models were effective in calculating fuel loading and water ratio. Fuel loading, water ratio and thickness of combustibles are regarded as the parameters of potential surface fire behavior. Based on a cluster analysis, the potential surface fire behavior of different forest lands was divided into 3 classes: strong, medium, or weak surface fire. The results indicated that most of artificial coniferous forests were in the status of medium surface fire, the risk of surface fire of mixed forests was lower than pure forests, and that of sapling forests and half-mature forests was higher than near-mature forests.
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