山西农业大学学报（自然科学版）2024，Vol.44Issue(2)：110-118,9.DOI:10.13842/j.cnki.issn1671-8151.202312037
华北落叶松林林分密度对林下更新影响研究
Study on the effect of stand density on understory regeneration in Larix principis-rupprechtii Forest in North China
摘要
Abstract
[Objective]Larix principis-rupprechtii is one of the dominant tree species in the cold temperate coniferous forest.Exploring the regeneration characteristics of L.principis-rupprechtii forest can provide a basis for a deeper understanding of the potential ecological mechanism of natural regeneration in L.principis-rupprechtii forest.[Methods]Taking L.principis-rupprechtii forest in Guandi Mountain area as the research object,three stand density types were set up to analyze the composi-tion,structure,and spatial patterns of understory regeneration under different stand densities.[Results]In moderate density(825～827 plants·hm-2)L.principis-rupprechtii forest,the understory regeneration was in good condition,with a significant increase in the number of regeneration seedlings(3500 plants·hm-2),mostly at low age levels,and relatively fewer seedlings at higher age level,showing a continuous and relatively stable distribution of regeneration seedling age levels.However,in low density(575～700 plants/hm2)and high density(1000～1125 plants·hm-2)L.principis-rupprechtii forests,the understory re-generation was poor,with a significant decrease in the number of regeneration seedlings(≤1250 plants·hm-2),and the age lev-el structure of regeneration seedlings was discontinuous transition from saplings to young trees.In terms of growth,the plant height and ground diameter growth of understory regeneration seedlings were best in low density stands.Dominant tree species among the regeneration saplings showed significant aggregation distribution in all three stand densities.The spatial heterogene-ity of regeneration seedlings were strong in low and moderate density of L.principis-rupprechtii,while it was weak in high-density stands.Spatial variation of regeneration seedlings was mainly caused by structural factors.[Conclusion]Excessive stand density,either too dense or too sparse,is detrimental to the regeneration of L.principis-rupprechtii forest.Timely density regulation is beneficial for the sustainable development of L.principis-rupprechtii forest in North China.关键词
华北落叶松/林分密度/更新苗/格局特征Key words
Larix principis-rupprechtii/Stand density/Regeneration/Pattern characteristic分类
农业科技引用本文复制引用
陈欣,韩有志..华北落叶松林林分密度对林下更新影响研究[J].山西农业大学学报（自然科学版）,2024,44(2):110-118,9.基金项目
国家自然科学基金项目(31901365) （31901365）
