不同林分类型植被可燃物载量差异分析——以灵山县森林火灾风险因子普查为例

Analysis on the Amount of Vegetation Fuel in Different Forest Types——A Case Study of Forest Fire Risk Factor Survey in Lingshan County

本文森林火险普查数据表明,区域内的不同林分类型的单位面积蓄积量、可燃物载量差异显著(p<0.05),不同林分类型的林下灌木、草本、枯落物的干鲜比差异显著(p<0.05);区域内的人工成、过熟林中郁闭度桉树单位面积蓄积量和可燃物载量均为最大,人工幼龄林中郁闭度桉树林分的单位面积蓄积量和可燃物载量均为最小;随着林龄的增大,林分的乔木层、林下枯落物层的可燃物载量均逐渐增大;软阔混交林的乔木层可燃物载量最大,桉树林次之,马尾松林的乔木层可燃物载量最小,马尾松林分的可燃物载量总量也最小;人工林和天然林相比,天然林的可燃物总载量高于人工林。普查林分的林下枯落物干鲜比均在75%和90%之间,属于森林火灾的可燃和易燃状态。

The census data showed that the mu stock and fuel load of different stand types in the region were significantly different(p<0.05),and the dry-fresh ratio of understory shrubs,herbs and litter of different stand types was significantly different(p<0.05).In the region,the stock amount and fuel load of eucalyptus mu in the overmature artificial forest were the largest,while the stock amount and fuel load of eucalyptus mu in the young artificial forest were the smallest.With the increase of the age of the stand,the tree layer and the litter layer increase gradually.The fuel load of soft and broad mixed forest was the largest,followed by eucalyptus forest,Masson pine forest was the smallest,and the total fuel load of Masson pine was also the smallest.Compared with natural forest,the total fuel load of natural forest was higher than that of natural forest.The dry-fresh ratio of understory litter in the survey stands is between 75%and 90%,which belongs to the combustible and flammable state of forest fire.