云南松林火烧迹地初期植被更新特征及环境解释

打开文本图片集

中图分类号：S718.5 文献标志码：A 文章编号：1673-923X（2025）10-0069-08

Characteristics of early vegetation regeneration and environmental interpretation in burned Pinusyunnanensisforest

ZHUTengdaa，LIXiaoyingʰ，WANGYiwenb，WUSizhengt （a.CollegeofEcologyandEnvironment;b.CollegeofSoiland WaterConservation，SouthwestForestryUniversity Kunming 650224，Yunnan，hina）

Abstract：【Objective】Inordertoexplorethecharacteristicsofvegetationregenerationintheearlystageof tebuntlandofuan pine forest.【Method】This study focused on the aftermath of the Ωe4⋅11，3 forest fire that occurred in YuxiCity，Yunnan Province in 2023. A total of 54 plotsmeasuring 10m×10m were established to represent varying levels of fire intensity.Plant surveys and soil analyses wereconductedforunderstoryshrubandtreesaplingregenerationandrdundancyanalysiswasemployedtoexploetheelatiship betwenunderstoryplantrecoverycharacteristicsandenvironmentalfactors.【Result】Theresultsshowedthat162 speciesof plants ofl33generaand58fmilsereidentifedinthestudyreaSpeciesdversityindicesshowedanoveralltrendofdcreasingadthn increasingwithicreasingfireintensityTheMargalefichessindex（R）anddiversitytreshold（E）werepositivelyoelatedwithfire intensity，and thedifferencewassignificant （P<0.05 ）.Redundancyanalysisshowed thatTN，fireintensity，foreststand，elevationand slopeaspectarethemainexplanatoryfactorsafectingspeciesdiversitywhiletheimportancevalueofshrublayerwasgreatlyaffected byaltitude and forest stand. The regeneration coverage of understory vegetation was 67% for unburned areas， 43% for lightly burned areas， and 32% forseverely burnedareas.Thedensityof tree seedingswasin the order ofLow fire intensity > High fire intensity > unburnedareas，Theregenerationdensityoftheuphillsopewashigherthanthatofthedownhillslopeintheigfreintensityarea. Therewasasignificant negativecorelation between tree seedings densityandunderstory vegetationregenerationcoverage （P<0.05 ） 【Conclusion】Fireincreasedthediversityofunderstoryvegetationtoacertainextent，owfireintensitywasmostbeneficialtoth regeneration of P. yunanensisseedlings.Onseverelyburnedsites，thedensityofseedingsandtheregenerationcoveragearelow，with theriskofsoileosionThesultswereofgreatsignifcanceforpredictigtestructuralandfunctioalchangesoffrestecosystemand scientific management after fire.

Keywords：burned blank; regeneration; redundancyanalysis; environmental factors

火作为自然界中一种强烈的干扰因子，对森林生态系统的结构和功能产生深远影响。（剩余11310字）