不同间伐强度对大花序桉人工林生长的影响  

Effects of Thinning Intensity on Growth of Eucalyptus cloeziana Plantations

作　　者：方晓娟 伍勇 方能干 廖靖 李冬梅 农小青 唐庆兰[1] 陈健波[1] FANG Xiaojuan;WU Yong;FANG Nenggan;LIAO Jing;LI Dongmei;NONG Xiaoqing;TANG Qinglan;CHEN Jianbo(Guangxi Forestry Research Institute/Nanning Eucalypt Plantation Ecosystem Observation and Research Station of Guangxi,Nanning530002,Guangxi,China;Guangxi State-owned Qipo Forest Farm,Nanning 530225,Guangxi,China)

机构地区：[1]广西林业科学研究院/南宁桉树森林生态系统广西野外科学观测研究站,广西南宁530002 [2]广西国有七坡林场,广西南宁530225

出　　处：《桉树科技》2023年第3期31-35,共5页Eucalypt Science & Technology

基　　金：广西林业科技示范推广项目([2021]GT15号);广西自筹林业科技项目(桂林科研[2022ZC]第83号)。

摘　　要：以4年生大花序桉林分为研究对象,设置3种间伐强度(保留密度分别为375、525、735株·hm^(-2))开展间伐试验,探讨间伐对大花序桉林分生长的影响。结果表明:间伐后26个月,不同间伐强度林分的平均胸径、树高及单株材积增长量差异显著,随着间伐强度的增加,其林分的平均胸径、树高、单株材积增长量逐渐增大。不同间伐强度林分蓄积增长量差异不显著;不同间伐强度林分活立木蓄积和间伐蓄积的总和差异不显著,保留375株·hm^(-2)的林分蓄积生长量经过26个月生长后可达保留735株·hm^(-2)的林分蓄积生长量水平,但保留375株·hm^(-2)的林分提高了林木的径级和林分经济效益。Effects of thinning on the growth of 4-year-old Eucalyptus cloeziana plantations were studied by setting three thinning intensities(375,525,735 trees·hm^(-2)).At 26 months after thinning,there were significant differences in average DBH,tree height and individual tree volume among treatments.The average DBH,tree height,and individual tree volume increased gradually with increasing thinning intensity.No significant differences were found in stand volume growth among different thinning intensities,and there was no significant difference in the sum of standing stock and thinned volume for the different thinning intensities.The plantation thinned to 375 trees·hm^(-2) can reach the same standing volume level of 735 trees·hm^(-2) after 26 months,but plantations thinned to a density of 375 trees·hm^(-2) can improve the diameter classes and thus improve the plantation economic benefits.

关 键 词：大花序桉 人工林 间伐 林分生长 

分 类 号：S753.71[农业科学—森林经理学]