立地及密度对杉木林分生长及材种结构的影响  

Effects of site quality and stand density on the growth and timber grade structure of Chinese fir plantations

作　　者：陈琴 董利军[3] 黄开勇 段爱国[4] 戴俊[2] 胡建军[3] CHEN Qin;DONG Lijun;HUANG Kaiyong;DUAN Aiguo;DAI Jun;HU Jianjun(College of Forestry,Beijing Forestry University,Beijing 100083,China;Timber Forest Department,Guangxi Zhuang Autonomous Region Forestry Research Institute,Nanning,Guangxi 530002,China;Beijianghe Forest Farm of Rongshui County,Liuzhou,Guangxi 545300,China;Research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091,China)

机构地区：[1]北京林业大学林学院,北京100083 [2]广西壮族自治区林业科学研究院用材林研究所,广西南宁530002 [3]融水苗族自治县国营贝江河林场,广西柳州545300 [4]中国林业科学研究院林业研究所,北京100091

出　　处：《森林与环境学报》2024年第6期647-653,共7页Journal of Forest and Environment

基　　金：“十四五”国家重点研发计划子课题“广西杉木人工林生长优化控制技术研究”(2021YFD2201301-3);广西壮族自治区林业科学研究院研究团队项目(2024RT04)。

摘　　要：为探讨立地及密度对广西融江流域杉木人工林生长及材种结构的影响,以不同立地条件下的杉木人工林为研究对象开展间伐试验,于林分13年生时进行生长量调查和分析。结果表明:林分树高、胸径、蓄积量、中径材出材率、规格材出材量随地位指数提高而增加,且地位指数级越高时,地位指数提高一级所带来的树高和中径材出材率增幅越大;地位指数越高,大径材形成的时间越早,大径材出材率越高;该林龄阶段(13年生),林木主要分布于14、16、18 cm三个径阶内,且随林分密度减小,≤14 cm径阶林木株数占比减小,≥20 cm径阶林木株数占比增大,小径材出材率减小,中径材出材率增大;随林分密度减小林分蓄积量显著减少,但规格材出材量增加。This study investigated the effects of site quality and stand density on the growth and timber grade structure of Chinese fir plantations in the Rongjiang Basin of Guangxi,China.Chinese fir plantations with different site conditions were selected.A tending experiment was performed on these plantations;growth and timber grade structure data were acquired and analyzed.Improvement in site quality significantly enhanced stand height,diameter at breast height,stand volume,medium-diameter timber yield,and timber dimensions.The tree height and medium-diameter timber yield increased as the site index increased.The higher the site index,the earlier the formation and the higher the yield of large-diameter timber.At this age stage(13 years),the trees in the stand were mainly distributed in three diameter classes of 14,16 cm,and 18 cm.A decrease in stand density resulted in significant reduction in both the proportion of trees≤14 cm in diameter and the output rate of small-diameter timber and significant increase in the proportion of trees≥20 cm in diameter and the output rate of medium-diameter timber.Stand volume decreased with decreasing stand density,but the output of timber dimensions showed an increasing trend.

关 键 词：人工林 杉木 生长量 出材量 地位指数 林分密度 

分 类 号：S725.7[农业科学—林木遗传育种]