文献类型：期刊文献

中文题名：杉木人工林自然整枝进程研究

英文题名：Study on the Self-pruning of Chinese Fir Plantation

作者：孙洪刚[1] 张建国[2] 段爱国[2]

第一作者：孙洪刚

机构：[1]中国林业科学研究院亚热带林业研究所;[2]国家林业局林木培育重点实验室,中国林业科学研究院林业研究所

年份：2014

卷号：27

期号：5

起止页码：626-630

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

基金：中央级公益性科研院所基本科研业务费专项资金项目(RISF6158)

语种：中文

中文关键词：杉木;自然整枝;造林密度;林分自疏;干形

外文关键词：Cunninghamia lanceolata ; self-pruning; initial planting density ; self-thinning ; stem form

分类号：S791.27

摘要：利用25年定位观测数据来阐明杉木人工林的自然整枝规律。研究结果表明:造林密度越大,杉木人工林自然整枝发生的时间越早,自然整枝强度也越大;当林木树冠比率(树冠长度/树高)降低到0.40时,不同造林密度小区的树冠比率降低幅度明显减小;当林木树冠比率减小到0.30时,发生林分自疏,且不受造林密度和林木死亡率的影响;在杉木人工林开始自然整枝但尚未进入到林分自疏阶段时,不同造林密度小区的树冠宽度/树冠长度比值均迅速上升;在林分自疏早期阶段,树冠宽度/树冠长度上升速率明显减缓;在林分自疏后期林木死亡率明显增大的条件下,树冠宽度/树冠长度又再次迅速上升,树冠形态的变化表现出明显的密度效应,但在自然整枝的整个过程中,树冠宽度/树冠长度均小于1;在杉木人工林自然整枝过程中,同化物质在林木生长过程中的分配模式发生改变,从而出现林木的干形指标(树高/胸径)随着自然整枝强度增大而减小的变化规律。
The data of 25 years＇ positional observation were used to investigate the effects of self-pruning on Chi- nese fir （Cunninghamia lanceolata） plantations. The study examined five initial density levels （2m × 3m, 2m × 1.5m, 2m × lm, lm × 1.5m, and lm × lm） with three replications at each level based on the randomized block design. The higher the initial planting density, the sooner the self-pruning happened and the higher the self-pruning intensity was. While living crown ratio （CL/TH） decreased to 0.4, the CL/TH ratio fluctuation tended to a con- stant. When the CL/TH ratio decreased to 0.3, the self-thinning happened, regardless the initial planting density and mortality. When serf-pruning happened, the ratio of tree crown width to the living crown height （CW/CH） rap- idly increased, then slowly increased during the early self-thinning and increased rapidly again during the late self- thinning. However, the CW/CH ratio was always below 1. Allocation pattern with assimilation matter changed when self-pruning happened, and stem form index （H/D） decreased when the living crown ratio increased.