【摘要】 以松江河林业有限公司3种天然混交林为研究对象，对不同龄组林下地表细小可燃物负荷量进行调查与分析。结果表明：3种森林类型林下地表细小可燃物总质量138.5万t,森林火灾发生风险依次为针叶混交林>阔叶混交林>针阔混交林，森林火灾蔓延风险依次为阔叶混交林>针阔混交林>针叶混交林；5个龄组中森林火灾发生风险依次为中龄林>成熟林>过熟林>近熟林>幼龄林，森林火灾蔓延风险依次为成熟林>中龄林>近熟林>过熟林>幼龄林。对不同森林类型、不同龄组内林下地表细小可燃物分区施策，可有效降低森林火灾的发生风险。更多还原

【Abstract】 Taking three types of natural mixed forests in Songjianghe Forestry Co.,Ltd. as the research object, the load of surface fine combustibles in the understory with different age groups was investigated and analyzed. The results showed that the total mass of surface fine combustibles was 1.385×10~6 t. The fire risk of three types of natural mixed forests was as follows: coniferous mixed forests > broad-leaved mixed forests > coniferous and broad-leaved mixed forests. The fire spreading risk of three types of natural mixed forests was as follows: broad-leaved mixed forests > coniferous and broad-leaved mixed forests > coniferous mixed forests. The fire risk of the forest with different age groups was as follows: half-mature forest > mature forest > over-mature forest > near-mature forest > young forest. The fire spreading risk of the forest with different age groups was as follows: mature forest > half-mature forest > near-mature forest > over-mature forest > young forest. It could effectively reduce the occurrence of forest fire to deal with surface fine combustibles in the understory according to different forest types and different age groups.更多还原