不同强度林火干扰对红花尔基樟子松天然林更新的影响

摘要

在依据火烧迹地林木烧伤程度确定林火强度基础上,对内蒙古红花尔基樟子松林国家级自然保护区不同林火强度下的幼苗更新状况进行调查和分析,以期探明自然条件下林火干扰对樟子松天然林更新的影响,为今后开展林火促进更新方面提供科学依据。结果表明：不同火烧强度下更新树种均为樟子松；樟子松天然更新株数介于2500~6500株？hm-2,平均值为4542株？hm-2；樟子松天然更新频度介于50%~100%,平均值为89%；表明林火能够促进樟子松天然更新。随着火烧程度增加,樟子松天然更新株数和频度显著降低,轻度和中度火烧更有利于促进樟子松天然更新,而重度和极重度火烧下樟子松仍能天然更新。%Fire intensity were determined by the degree of burned forest in the burned area.In order to ascertain the effects of fire disturbance on regeneration of natural forest for Pinus sylvestris var.mongolica and provide a scientif-ic basis for the future,the regeneration of young seedlings under different fire intensities in Honghuaerji National Nature Reserve of Inner Mongolia were analyzed.Research shows that the regeneration species are all Pinus sylves-tris var.mongolica under different fire intensities;the regenerated numbers of Pinus sylvestris var.mongolica are among 2 500-6 500 trees ?hm-2 ,the average value being 4 542 trees ?hm-2;the frequency of natural regeneration for Pinus sylvestris var.mongolica among 50%-100%,with an average being 89%,which shows forest fire can pro-mote natural regeneration of Pinussylvestris var.mongolica.With the increase of the degree of fire,the number and frequency of natural regeneration for Pinus sylvestris var.mongolica significantly reduced;the frequency of mild and moderate burn are more conducive to the promotion of natural regeneration for Pinus sylvestris var.mongolica;Pi-nus sylvestris var.mongolica can still regenerated under severe & very severe fire.