基于树轮研究马尾松⁃红锥混交对马尾松生产力及稳定性的影响  

Evaluating the effects of Pinus massoniana and Castanopsis hystrix mixing on the productivity and temporal stability of Pinus massoniana based on tree ring analysis

作　　者：李琼莹 陈仁杰 李泽伟 申卫军 LI Qiongying;CHEN Renjie;LI Zewei;SHEN Weijun(College of Forestry,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Forest Ecology and Conservation,College of Forestry,Guangxi University,Nanning 530004,China;State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources,College of Forestry,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学林学院,南宁530004 [2]广西大学林学院,广西森林生态与保育重点实验室,南宁530004 [3]广西大学林学院,亚热带农业生物资源保护与利用国家重点实验室,南宁530004

出　　处：《生态学杂志》2024年第12期3605-3614,共10页Chinese Journal of Ecology

基　　金：国家自然科学基金面上项目(32271847);广西科技基地和人才专项(AD23026326);广西研究生教育创新计划项目(YCBZ2023024)资助。

摘　　要：近年来混交林成为维持和提升人工林生产力及生态效益的发展方向,但目前集中在两个时间点生产力差异的静态研究不能准确地反映树木整个生命周期的混交效应。本研究以相邻且具有相似环境条件和经营策略的马尾松纯林、马尾松⁃红锥同龄混交林为对象,用树木年轮学方法记录林分动态变化并比较马尾松混交林与其纯林生产力及稳定性的差异。结果表明:混交39年后混交林内马尾松生产力(以胸高断面积增量表示)比纯林低36.8%,各个林龄阶段的生产力稳定性均低于对应纯林;马尾松混交效应除干旱特征年外均为负值,且不同龄级混交的影响程度不同,说明同龄混交中马尾松和红锥的种间互补作用低于种间竞争作用。总体来说,在营造人工混交林时应充分考虑树种的功能性状,根据不同树种的性状来选择适当的混交方式;同时,在管理混交林时应在树木受到强烈的光胁迫之前及时进行间伐或透光伐,以促进其可持续经营。Mixed⁃species plantations have emerged as an effective measure for maintaining forest productivity and ecological services over recent years.However,current research predominantly focuses on comparing productivity differences between two distinct periods,providing limited insights into the comprehensive mixing effects across the entire lifespan of trees.In this study,we employed dendrochronological methods to assess the productivity of the monoculture of Pinus massoniana and an even⁃aged mixture of P.massoniana and Castanopsis hystrix grown under similar environmental conditions and management regimes.Our objectives were to document stand dynamics and to compare the productivity and temporal stability of mixed plantation versus monoculture of P.massoniana.The re⁃sults showed that,after 39 years of mixing,the productivity of P.massoniana,measured as basal area increment(BAI),in the mixed plantation was 36.8%lower than that in monoculture.Furthermore,the temporal stability of productivity of P.massoniana in the mixed plantation was lower than that in the mixed plantation across all age clas⁃ses.The mixing effects of P.massoniana were negative except in drought years.Such effects varied in different age classes,suggesting that the strength of interspecific complementarity of P.massoniana and C.hystrix in the even⁃aged mixed plantation was lower than that of interspecific competition.Overall,our results emphasize the impor⁃tance of considering functional traits and selecting appropriate mixing modes when establishing mixed⁃species for⁃ests.To achieve sustainable management of mixed forests,timely thinning or release cutting is recommended to mitigate the strong light competition among trees.

关 键 词：人工林 同龄混交林 龄级 生长动态 稳定性 

分 类 号：S791.248[农业科学—林木遗传育种]