造林密度对杉木幼林林下植被种群种间关联的影响  

Effects of different planting densities on interspecific associations of understory plant populations in young Cunninghamia lanceolata plantations

作　　者：冉晋铧 黄樱 熊雨忠 林开敏[1,3] 曹光球 RAN Jinhua;HUANG Ying;XIONG Yuzhong;LIN Kaimin;CAO Guangqiu(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;Pushang State-owned Forestry Farm of Shunchang,Fujian Province,Nanping,Fujian 353200,China;Chinese Fir Engineering Technology Research Center of National Forestry and Grassland Administration,Fuzhou,Fujian 350002,China;University Key Laboratory of Forest Stress Physiology,Ecology and Molecular Biology of Fujian Province,Fuzhou,Fujian 350002,China)

机构地区：[1]福建农林大学林学院,福建福州350002 [2]福建省顺昌埔上国有林场,福建南平353200 [3]国家林业和草原杉木工程技术研究中心,福建福州350002 [4]林木逆境生理生态及分子生物学福建省高校重点实验室,福建福州350002

出　　处：《亚热带农业研究》2025年第1期11-19,共9页Subtropical Agriculture Research

基　　金：“十三五”国家重点研发计划项目“杉木高效培育技术研究”(2016YFD0600301)。

摘　　要：[目的]探究不同造林密度对杉木幼林林下植被种群种间关联的影响,为杉木幼林的经营管理提供依据。[方法]以不同造林密度(833、2 500、6 667株·hm^(-2))7年生杉木幼林为研究对象,采用方差比率法测定林下草本层、灌木层优势种的总体关联性;通过AC联结系数和Spearman秩相关系数比较草本层、灌木层的种间关联强度;采用M.Gordon贡献定律法进行群落稳定性分析。[结果]不同造林密度杉木幼林草本层共42个种,灌木层共36个种。方差分析表明,2 500株·hm^(-2)林分的草本层、灌木层优势种总体呈正关联。AC联结系数、Spearman秩相关系数分析表明,2 500株·hm^(-2)林分林下植被优势种呈正关联的种对数最多,种间关联强度最大。M.Godron稳定性分析表明,造林密度为2 500株·hm^(-2)时,林下植被群落整体稳定性相对较好。[结论]3种造林密度下,2 500株·hm^(-2)杉木幼林草本层、灌木层优势种的关联性最强,林下植被群落相对稳定。[Purpose] This study aims to explore the effects of varying planting densities on the interspecific associations of understory plant populations in the young plantations of Cunninghamia lanceolata,thus providing a basis for the management of these young plantations.[Method] The 7-year-old Cunninghamia lanceolata plantations with three planting densities(833,2 500,and 6 667 plants·hm~(-2)) were studied.The overall associations of dominant species in the herb and shrub layers were assessed by the variance ratio method.The autocorrelation coefficient(AC) and the Spearman rank correlation coefficient were calculated to assess the interspecific associations in the herb and shrub layers.Additionally,the M.Godron stability measure was employed to analyze the community stability.[Result] The herb and shrub layers in the young Cunninghamia lanceolata plantations with different planting densities harbored 42 and 36 species,respectively.The analysis of variance indicated that the dominant species in both the herb and shrub layers of the stand with the density of 2 500 plants·hm~(-2) exhibited a positive association overall.Furthermore,the analysis of the AC and Spearman rank correlation coefficient revealed that the stand with the density of 2 500 plants·hm~(-2) had the highest number of positive associations of dominant species,with the strongest interspecific associations.The M.Godron stability analysis demonstrated that at a planting density of 2 500 plants·hm~(-2),the understory vegetation community presented relatively good stability.[Conclusion] Under three afforestation densities,the correlation between the dominant species in the herbaceous layer and the shrub layer of the 2 500 plants·hm~(-2) young plantations of Cunninghamia lanceolata stand was the strongest,and the understory vegetation community was relatively stable.

关 键 词：造林密度 杉木幼林 林下植被 优势种 种间关联 群落稳定性 

分 类 号：S791.27[农业科学—林木遗传育种]