不同种植密度与修枝强度对幼龄尾巨桉生长量的影响  

Effects of Planting Density and Pruning Intensity on Growth of Eucalyptus urophylla × E. grandis

作　　者：白卫国 黎世鑫 李蔷薇 熊涛 赵佳宁 任世奇[2] BAI Weiguo;LI Shixin;LI Qiangwei;XIONG Tao;ZHAO Jianing;REN Shiqi(Guangxi State-owned Dongmen Forest Farm,Fusui 532100,Guangxi,China;Guangxi Forestry Research Institute,Guangxi Nanning Eucalypt Plantation Ecosystem Observation and Research Station,Nanning 530002,Guangxi,China)

机构地区：[1]广西国有东门林场,广西扶绥532100 [2]广西林业科学研究院,广西南宁桉树森林生态系统定位观测研究站,广西南宁530002

出　　处：《桉树科技》2022年第2期20-24,共5页Eucalypt Science & Technology

基　　金：广西林业科技与推广项目“桉树无节材培育技术推广示范”(gl2018kt11);广西林业科技推广示范项目“桉树无节材智能修枝系统研发与示范”(gl2020kt03)。

摘　　要：为探讨尾巨桉在生产实践中不同种植密度下的适宜修枝强度,通过设置3种尾巨桉种植密度:P1(1 665株·hm^(-2),株行距:2 m×3 m)、P2(1 320株·hm^(-2),株行距:2.5 m×3 m)、P3(1 110株·hm^(-2),株行距:3 m×3 m)和3种修枝强度:不修枝、轻度修枝(修去活枝冠层1/3的下层枝条)、中度修枝(修去活枝冠层1/2的下层枝条),探讨修枝后6个月的幼龄尾巨桉生长量差异。结果表明:种植密度1 320株·hm^(-2)的平均胸径极显著高于1 650株·hm^(-2)和1 110株·hm^(-2),但种植密度1 650株·hm^(-2)的平均树高极显著高于1 320株·hm^(-2)和1 110株·hm^(-2),表明1 110株·hm^(-2)的种植密度未充分利用林地空间;中度修枝的平均胸径稍大于不修枝,表现出一定程度上促进胸径生长的作用;种植密度1 320株·hm^(-2)×中度修枝的单株材积增量最大。就尾巨桉幼龄期的生长量初步分析认为,种植密度1 320株·hm^(-2)×中度修枝是培育尾巨桉优质无节材的较适宜处理组合。To examine suitable pruning intensities for Eucalyptus urophylla×E.grandis under different planting densities we analyzed growth of young E.urophylla×E.grandis plantations at three planting densities,which were P1 (1 665 plants·hm^(-2),spacing 2 m×3 m),P2 (1 320 plants·hm^(-2),spacing 2.5 m×3m),P3 (1 110 plants·hm^(-2),spacing 3 m×3 m) and with three pruning intensities (no pruning,slight pruning,moderate pruning).The results showed that mean DBH (diameter at breast height) of P2 was significantly higher than that of P1 and P3 whilst the mean height of P1 was significantly higher than that of P2 and P3.The results indicated that P3 under utilised the site resources.Meanwhile,mean DBH of slight pruning was slightly larger than that of no pruning and moderate pruning showed a certain trend of promoting DBH.Single tree volumes in the treatment combination P2 with moderate pruning was higher than others.Therefore,we conclude that the treatment combination of P2 and moderate pruning was the most suitable for cultivating clear wood in E.urophylla×E.grandis plantations.

关 键 词：森林培育 种植密度 修枝强度 尾巨桉 生长量 

分 类 号：S753.518[农业科学—森林经理学]