溪頭之一千株及二千株栽種密度柳杉長期試驗地之生長比較

Growth Comparison between 1000 and 2000 Stand Densities from Long-term Research Sites of Japanese Cedar in Xitou

余瑞珠(Jui-Chu Yu) ； 蔡明哲(Ming-Jer Tsai) ； 王亞男(Ya-Nan Wang)

《國立臺灣大學生物資源暨農學院實驗林研究報告》 25卷1期 (2011/03) Pp. 25-32

https://doi.org/10.6542/EFNTU.201103_25(1).0002

摘要

本研究旨在探討不同栽植密度的柳杉（Cryptomeria japonica）人工林林分之80年生長差異，結果顯示：在1000株以及2000株之不同栽植密度對林木生長有影響，隨著林齡增加，胸徑生長在1,000株栽植密度中比在2,000株栽植密度高。1,000株胸徑1934年至2009年平均增加37.75cm，但2,000株只平均增加34.16cm；樹高部份1,000株栽植密度增加23.9m，2,000株栽植密度則增加了24.2m，由於歷年的平均單木材積生長與蓄積量變動受到存活率的影響。所以若經營目標為收獲量大，則需選擇栽植密度較高者。

關鍵字

柳杉 ； 林分密度

並列摘要

The objective of this study was to compare Japanese Cedar (Cryptomeria japonica) growth between different stand densities after 80 years of plantation. The result showed that the stand growth was affected by the stand density. As tree's age increases, DBH (Diameter at breast height) growth in 1,000/ha is higher than that in 2,000/ha. DBH in 1,000/ha density stand increased 37.75cm from 1934 to 2009, but increased 34.16cm in 2,000/ha stand density. Tree height in 1000/ha stand density increased 23.9cm from 1934 to 2009, but increased 24.2cm in 2000/ha stand density. The variations of averaged individual volume and stock were influenced by survival rates. Therefore, if the maximum stand volume is the management target, a higher stand density is recommended.

並列關鍵字

Cryptomeria japonica ； Stand density