摘要
本研究通过对9年生尾巨桉人工林进行7个不同强度的间伐处理,分析各处理间径阶分布范围、林分生长因子、单株材积等指标,并核算经济效益。结果表明:间伐后3 a,保留500、400、300、200株·hm^(-2)处理胸径增量和单株材积增量极显著高于未间伐处理;间伐后2、3 a,树高增量只有保留200株·hm^(-2)处理极显著高于未间伐处理;皆伐利润随着间伐强度的增加呈现先增加后降低的趋势,产值最高的为保留500株·hm^(-2)处理,年均产值达30851.00元·hm^(-2)。在大径材培育过程中,间伐能极显著增加林分中大径材相对比例、生长量,进一步提高经济效益。
In this study,7 treatments involving different intensities of thinning were applied to a plantation of 9-year-old Eucalyptus urophylla×E.grandis.Differences in diameter distributions,growth and volume per tree among treatments were analyzed along with estimated economic benefit over a whole rotation of each treatment.At 3 years after thinning,in treatments that retained 500,400,300,or 200 trees·hm^(-2) the DBH increments and also volume per tree increments were significantly higher than in the treatment with no thinning.At 2 and 3 years after thinning,only the treatment that retained 200 trees·hm^(-2) had significantly higher tree height increment than the treatment with no thinning.The net profit per rotation was estimated to increase at first and then decrease with increasing intensity of thinning.The highest profit would be obtained by the treatment that retained 500 trees·hm^(-2),and this would provide an average annual income of 30851.00 yuan·hm^(-2).In the process of cultivating large-diameter trees,appropriate thinning can help divert more of the increment of a eucalypt plantation onto larger diameter trees,and thereby improve economic efficiency.
作者
赵英伟
邱炳发
彭智邦
陆珍先
张广祥
张磊
ZHAO Yingwei;QIU Bingfa;PENG Zhibang;LU Zhenxian;ZHANG Guangxiang;ZHANG Lei(Guangxi Dongmen State-owed Forest Farm,Chongzuo 532108,Guangxi,China)
出处
《桉树科技》
2021年第1期16-22,共7页
Eucalypt Science & Technology
基金
国家重点研发计划课题“桉树大径材定向培育技术”(2016YFD0600502)。
关键词
桉树
大径材
间伐
经济效益
Eucalyptus
large diameter timber
thinning
economic effect
作者简介
赵英伟(1993-),男,硕士,助理工程师,主要从事桉树良种选育与栽培技术研究,E-mail:418847773@qq.com;通信作者:张磊(1988-),男,硕士,工程师,主要从事桉树良种选育与栽培技术研究,E-mail:zhanglei506@163.com。
