不同造林密度欧美107杨用材林最佳采伐期的研究  

Study on optimal felling period of timber forest of Populus×euramericana with different density planting

作　　者：刘春鹏[1,2] 刘泽勇 李向军[1,2] 刘四围 支恩波[1,2] 李新利 LIU Chunpeng;LIU Zeyong;LI Xiangjun;LIU Siwei;ZHI Enbo;LI Xinli(Hebei Academy of Forestry Sciences,Shijiazhuang 050061,Hebei,China;Hebei Engineering Research Center for Trees Varieties,Shijiazhuang 050061,Hebei,China;Wenan Forestry Bureau,Wenan 065800,Hebei,China)

机构地区：[1]河北省林业科学研究院,河北石家庄050061 [2]河北省林木良种工程技术研究中心,河北石家庄050061 [3]文安县林业局,河北文安065800

出　　处：《中南林业科技大学学报》2018年第10期9-14,共6页Journal of Central South University of Forestry & Technology

基　　金：河北省林业科学技术研究项目"毛白杨缓苗期形成机理及缩短缓苗期关键技术"(1602477);省级科技计划专项工作类项目"杨树丰产林集约经营技术示范与推广"(13256823D)

摘　　要：以中小径材为培育目标,探讨不同造林密度欧美107杨Populus×euramericana用材林的最佳采伐期,以期为河北省平原地区杨树经营生产提供技术支持。本研究以欧美107杨为研究对象,设置了株行距为4 m×6m、4 m×5 m、3 m×5 m、3 m×4 m、3 m×3 m、2 m×3 m和2 m×2 m共7个不同的造林密度,然后对其进行了连续8年的生长情况调查,与此同时,对其单株材积连年生长量和年均生长量以及林分的经济效益进行了统计分析。(1)造林后8 a,各密度林分胸径、树高、单株材积随着林分密度的增大而减小,而单位面积蓄积没有表现出明显的规律;(2)各密度林分最佳采伐期一般为6～7 a;(3)就经济效益而言,各密度林分中,4 m×5 m林分造林后8年的总净收益和年均净收益最大,分别为71 480±6 036元·hm^(-2)和9 505±990元·hm^(-2)a^(-1),其中年均净收益最大值出现在造林后第7 a。在河北省平原地区,在进行以中小径材为培育目标的欧美107杨造林时,应采用株行距为4 m×5 m的林分密度,并于造林7 a后采伐。In order to provide technical support for the management and production of poplar in the plain area of Hebei,with the cultivation objectives of middle and small timber,the optimal logging period of Populus×euramericana was studied with different density planting.This study took Populus×euramericana as the study object,and took 4 m×6 m,4 m×5 m,3 m×5 m,3 m×4 m,3 m×3 m,2 m×3 m and 2 m×2 m seven different density planting,then continuously investigated their growth for eight years.Meanwhile,their annual and mean volume growth and economic benefit were analyzed.(1)In the eighth year after afforestation,the diameter,height and individual volume all decreased with the increasing of density planting,and There was not obvious law in the stock volume per unit area.(2)the optimal felling period of them with different density planting was usually 6-7 years.(3)As far as the economic benefit,in the eighth year after afforestation,the total net benefit and the mean net benefit of the stand with 4 m×5 m density planting were the most among them,the value respectively 71 480±6 036 yuan/hm2 and 9505±990 yuan/hm2·a.and the most mean net benefit appeared in the seventh year after afforestation.In the plain area of Hebei,when the afforestation of Populus×euramericana was taken with the cultivation objectives of middle and small timber,4 m×5 m density planting should be taken in the afforestation of poplar,and the stand should be harvested in the seventh year after afforestation.

关 键 词：最佳采伐期 造林密度 经济效益 用材林 欧美107杨 

分 类 号：S750[农业科学—森林经理学]