南亚热带杉木林分材积生长立地与密度效应
The Site and Planting Density Effects on the Timble Volume Growth of Chinese Fir Plantations in South Subtropical Zone
投稿时间:2018-11-28  修订日期:2019-03-07
DOI:
中文关键词:  杉木  人工林  材积  立地  密度  南亚热带
英文关键词:Cunninghamia Lanceolata  Plantation  Timber volume  Site  Density  South subtropical zone
基金项目:国家“十三五”重点研发计划课题“杉木速生材高效培育技术研究(2016YFD0600302)”、国家“十二五”科技计划课题“杉木速生丰产林定向培育技术研究(2015BAD09B0101)及国家自然科学基金面上项目(31570619)
作者单位E-mail
郭光智 中国林科院林业所,山东潍坊林业局 1308727478@qq.com 
段爱国 中国林科院林业所  
张建国 中国林科院林业研究所 zhangjg@caf.ac.cn 
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中文摘要:
      为揭示南亚热带不同密度和立地条件下杉木人工林材积发育规律,以广西大青山36年生杉木密度试验林为研究对象,分析了A(1667株?hm-2)、B(3333株?hm-2)、C(5000株?hm-2)、D(6667株?hm-2)、E(10000株?hm-2)5种初植密度杉木人工林总材积、活立木材积动态变化,得到3点主要结论:(1)中幼龄阶段林分总材积与初植密度正相关,但15a后中等密度林分总材积最大。(2)材积平均生长量达高峰后下降,密度越大下降越早、下降趋势越明显;林分材积连年生长量、平均生长量大多分别在10a、14a达到高峰,材积生长率降到3%时林分林龄位于19 ~ 25a,提示首次、最后间伐、主伐时间分别为10a、14a、25a。(3)立地指数对相对低初植密度林分总材积的影响程度更大,而随着初植密度的增大,立地指数对林分总材积的影响程度减弱。
英文摘要:
      To devote the effects of site and planting density on stand timber volume growth rules of Chinese fir (Cunninghamia Lanceolata) plantations in south subtropical zone, the total timber volume and standing timber volume dynamics were analyzed using the continuous observation data of 36-year-old Chinese fir density test stands at forest farm in Guangxi province, including five different planting densities of A(1667 trees?hm-2), B(3333 trees?hm-2), C(5000 trees?hm-2), D(6667 trees?hm-2), E(10000 trees?hm-2). Following conclusions had been drawn: (1) Total timber volume was obviously positively related to stand planting density during middle and young ages, and the stand with medium density became more bigger than the other after 15a. (2)The mean annual increment (MAI) of total timber volume first increased rapidly then declined after reaching the peak, and the higher the density was, the decline started earlier and more apparent. The stand ages at which the current annual increment (CAI), MAI of total volume reached its peaks were 10a and 14a respectively, and the total timber volume growth rate decreased to 3% at the age of 19 ~ 25a. The results showed that the first thinning, last thinning and final cutting age was about 10a, 14a, 25a respectively. (3)The influence of site index on the total volume of stands with relatively low planting density was greater, but with the increasing of planting density, the influence of site index on the total volume of stands is weakened.
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