3种初植密度桉树林分生长、材种出材量及经济效益动态分析  

Dynamic Analysis on Economic Benefit, Growth and Production ofEucalypt Plantations with Different Initial Densities

作　　者：张程 欧阳林男 陈少雄 ZHANG Cheng;OUYANG Lin-nan;CHEN Shao-xiong(China Eucalypt Research Centre,Zhanjiang 524022,Guangdong,China;Nanjing Forestry University,Nanjing 210037,Jiangsu,China)

机构地区：[1]国家林业和草原局桉树研究开发中心,广东湛江524022 [2]南京林业大学,江苏南京210037

出　　处：《林业科学研究》2021年第4期58-65,共8页Forest Research

基　　金：“十三·五”国家重点研发计划课题(2016YFD0600502);广东省林业科技创新项目(2019KJCX005);湛江桉树培育国家长期科研基地运行补助(2020132509)。

摘　　要：[目的]通过监测3种初植密度桉树人工林16 a的生长情况,分析其材种出材量及经济效益,为培育桉树中、大径材提供理论参考。[方法]收集和分析桉树人工林3种初植密度1250、883、667株·hm^(−2)16 a的生长数据,计算材种出材量,同时分析平均生长量、内部收益率和净现值。[结果]密度1250株·hm^(−2)与密度883、667株·hm^(−2)的胸径生长均差异显著(p<0.05);不同密度间林分蓄积量差异不显著(p>0.05)。中径材出材量及其年均出材量在7~12 a和第16年以密度883株·hm^(−2)的林分最大,7~12 a密度667株·hm^(−2)>1250株·hm^(−2),第16年密度1250株·hm^(−2)超过密度667株·hm^(−2)。密度883株·hm^(−2)在第16年开始出现大径材。密度1250株·hm^(−2)的轮伐期为7 a,密度883、667株·hm^(−2)均为9 a。9 a时密度1250、883株·hm^(−2)的净现值达到峰值,密度667株·hm^(−2)在8 a时达到峰值,密度1250、883、667株·hm^(−2)的最大净现值分别为30994、40193、31288元·hm^(−2),对应的内部收益率分别为37%、41%、42%。[结论]初植密度883株·hm^(−2)有最高的净现值、内部收益率以及较高的生长潜力,667株·hm^(−2)次之,1250株·hm^(−2)最低。[Objective]To study the economic benefit of Eucalyptus plantations with different initial planting densities by monitoring their growth.[Method]Three initial planting density treatments were tested,i.e.1250 tree·hm^(−2),883 tree·hm^(−2) and 667 tree·hm^(−2).The data of 16 years'growth were collected and analyzed to calculate the timber yield,mean annual increment(MAI),internal rate of return(IRR)and net present value(NPV).[Result]It is showed that the DBH of the plantation with initial planting density of 1250 tree·hm^(−2) was significantly different from that with the initial planting densities of 883 and 667 tree·hm^(−2) in the growth process(p<0.05).Meanwhile,there was no significant difference in stand volume among different initial planting densities(p>0.05).The largest timber yield and MAI of middle diameter timber were at the plantation with initial planting density of 883 tree·hm^(−2) in the range of 7th to 12th years and the 16th year,followed by the plantations with initial density of 667 tree·hm^(−2) and 1250 tree·hm^(−2).At the 16th year,the timber yield of middle diameter timber of the plantation with initial planting density of 1250 tree·hm^(−2) exceeded that of the plantation with initial planting density of 667 tree·hm^(−2).Large diameter timber began to appear at the plantation with initial planting density of 883 tree·hm^(−2) at the 16th year.The harvesting rotations of the plantations with initial planting densities of 1250,883 and 667 tree·hm^(−2) were 7,9 and 9 years respectively.At the 9th year,The NPV of the plantations with initial planting densities of 1250 and 883 tree·hm^(−2) reached the peak,while that of 667 tree·hm^(−2) was at the 8th year,The peak NPVs of the plantations with initial planting densities of 1250,883 and 667 tree·hm^(−2) were 30994,40193 and 31288 CNY·hm^(−2) and the peak IRRs were 37%,41%,42%respectively.[Conclusion]Overall,the plantation with initial planting density of 883 tree·hm^(−2) has the highest NPV and IRR,as

关 键 词：桉树 中、大径材 初植密度 出材量 经济效益 

分 类 号：S792.39[农业科学—林木遗传育种]