造林密度对黑木相思幼林生长及蓄积量的影响  

Effects of Acacia melanoxylon planting densities on growth indicators and stand volume

作　　者：彭玉华[1] 黄志玲[1] 郝海坤[1] 何琴飞[1] 曹艳云[1] 谭长强[1] PENG Yuhua;HUANG Zhiling;HAO Haikun;HE Qinfei;CAO Yanyun;TAN Zhangqiang(Guangxi Forestry Research Institute/Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation,Nanning,Guangxi 530002,China)

机构地区：[1]广西壮族自治区林业科学研究院/广西优良用材林资源培育重点实验室,广西南宁530002

出　　处：《亚热带农业研究》2022年第4期217-222,共6页Subtropical Agriculture Research

基　　金：国家林业和草原局林业知识产权转化运用项目(KJZXZZ2019013);广西林业局植物新品种保护与应用项目(gl2018kt20)。

摘　　要：[目的]探索黑木相思人工林的最佳造林密度,为其经营管理提供依据。[方法]以不同造林密度(2500、1667、1333株·hm^(-2))的黑木相思人工林为研究对象,分析其林分平均树高、胸径和单株材积等生长指标,并探讨了林分保存率及蓄积量的变化规律。[结果]造林密度总体上对黑木相思幼林树高、胸径、单株材积和林分蓄积量的影响显著,对保存率影响不显著。6年生黑木相思人工林平均树高随造林密度增大呈先增大后减小趋势,以1667株·hm^(-2)林分(18.35 m)最大;平均胸径、单株材积、保存率均随造林密度增大而逐渐减小,其中1333株·hm^(-2)林分平均胸径(14.91 cm)和单株材积(0.1045 m^(3))最大、大径材(>14径级)分布百分比(46.30%)最大、保存率(99.33%)最高;林分蓄积量随造林密度增大而增大,其中2500株·hm^(-2)林分蓄积量(211.287 m^(3)·hm^(-2))最大。[结论]营造短周期工业用材林宜选择2500株·hm^(-2)的造林密度,培育大、中径级材以1333株·hm^(-2)造林密度为宜。可根据经营目的,以2500株·hm^(-2)的初始密度造林,之后再进行间伐抚育,以实现黑木相思树种经济效益最大化。[Purpose]This study aims to explore the optimal planting density of Acacia melanoxylon and provide useful information to improve plantation management.[Method]In A.melanoxylon plantations with different afforestation densities(2500,1667,1333 stems·hm^(-2)),growth indicators including average tree height,diameter at breast height(DBH),and individual tree volume were measured,and the variation in survival rate and stand volume were analyzed.[Result]Planting density has generally significant effects on the tree height,DBH,individual volume and stand volume,rather than survival rate.6-year-old A.melanoxylon plantations with the increase of planting density average tree height of first increased and then decreased,with the maximum at 18.35 m by 1667 stems·hm^(-2).Average DBH,individual volume and survival rate eventually decreased with higher planting densities.The stand with the density of 1333 stems·hm^(-2)witnessed largest average DBH(14.91 cm)and individual volume(0.1045 m^(3)),as well as highest proportion(46.30%)of large diameter timber(>14 grades)and survival rate(99.33%).Stand volume increased with planting densities,with the peak of 211.287 m^(3)·hm^(-2)in the stand with 2500 stems·hm^(-2).[Conclusion]The planting density of 2500 stems·hm^(-2)is recommended for short-rotation industrial timber plantation,while planting density of 1333 stems·hm^(-2)is suitable for cultivating large and medium diameter timber.Oriented by management objectives,the planting density of 2500 stems·hm^(-2)could be initiated,followed by thinning,to maximize economic benefits from A.melanoxylon.

关 键 词：黑木相思 人工林 造林密度 生长量 径级结构 

分 类 号：S725.6[农业科学—林木遗传育种] S750[农业科学—林学]