格氏栲天然林更新特征及影响因子  

Regeneration Characteristics and Its Contributing Factors in Castanopsis kawakamii Natural Forests

作　　者：李淑静 王新杰[1] Li Shujing;Wang Xinjie(Beijing Forestry University,Beijing 100083,P.R.China)

机构地区：[1]北京林业大学,北京100083

出　　处：《东北林业大学学报》2023年第6期20-24,45,共6页Journal of Northeast Forestry University

基　　金：中央高校基本科研业务费专项资金项目(BLJD200907,JD2010-2)。

摘　　要：为明确格氏栲天然林更新现状及其主导因子,对该树种的保护和恢复提供参考,在结合格氏栲天然林林分现状、林龄结构以及更新树种重要值的基础上,采用逐步多元回归的方法探究了环境因子、林分结构因子对格氏栲林天然林不同等级更新密度的影响。结果表明:群落更新状况属于中等水平,总更新密度为2443.75株·hm^(-2)。格氏栲的更新状况不良,总更新密度为343.75株·hm^(-2),林龄多数集中在Ⅱ、Ⅲ、Ⅻ龄级,生长状态基本稳定,但更新幼苗与小苗数量极少,更新潜力不足。更新数量最多的是润楠,且重要值最大,格氏栲的重要值位于第4位。多元回归结果表明:更新密度同时受到环境因子与林分结构的共同作用,坡度在18°~25°之间时,坡度稍大且位于下坡位的阳坡区域更新密度较大。乔木层冠幅、土壤含水率和全氮质量分数是影响格氏栲群落更新密度的主导因子;土壤有效磷、有机质质量分数是影响格氏栲种群更新密度的主导因子。为促进格氏栲天然林的恢复和更新,应加强自然区的经营管理,有针对性的进行调整林分结构与土壤元素质量分数,合理利用林内空间,提高土壤肥力。The aims of this study were to clarify the regeneration characteristics and dominant factors affecting the regeneration of Castanopsis kawakamii natural forests,and thus to provide a reference for the protection and restoration of this tree species.The effects of environmental factors and stand structure factors on regeneration density of natural forest in C.kawakamii forest were investigated by step-up multiple regression method based on the current stand status,age structure and important value of regeneration species.The regeneration of the community belongs to the medium level and the density is 2443.75 ind·hm^(-2);while the regeneration of C.kawakamii is poor,and the density is 343.75 ind·hm^(-2).Most of the ages were concentrated in age classesⅡ,ⅢandⅫ,and the growth state was basically stable,only a small part of seedlings and plantlet,the regeneration potential is insufficient.The Machilus nanmu has the largest quantity and the important value is the most.The important value of C.kawakamii was the fourth.The results of multiple regression showed that the regeneration density was affected by both environmental factors and stand structure.When the slope was in 18°-25°,the sunny aspect area with a slightly larger slope and located at the lower position has a higher regeneration density.Crown width of tree layer,soil water content and total nitrogen are the dominant factors affecting the regeneration density of C.kawakamii community.Soil available phosphorus and organic matter are the dominant factors affecting the regeneration density of C.kawakamii population.It was necessary to strengthen forest operation and management,and the forest structure and soil element content should be adjusted.Besides,rationally regulate the space of the forest and increase soil fertility,which would promote the restoration and renewal of C.kawakamii natural forest.

关 键 词：格氏栲天然林 天然更新 立地因子 土壤元素 林分结构 

分 类 号：S718.5[农业科学—林学]