頁籤選單縮合
題 名 | 留存萌蘖枝數對銀合歡萌芽更新林分生長的影響 |
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作 者 | 潘富俊; 施文君; 馬復京; | 書刊名 | 林業試驗所研究報告季刊 |
卷 期 | 8:3 1993.09[民82.09] |
頁 次 | 頁219-228 |
分類號 | 436.27 |
關鍵詞 | 銀合歡; 萌芽更新; 萌蘖去蘖; 天然疏伐; 生長; Leucaena leucocephala; Coppicing; Coppice thinning; Self-thinning; Growth; |
語 文 | 中文(Chinese) |
中文摘要 | 由設置在南澳之銀合歡試區,5年生之林分砍伐後,第2年進行萌蘗去 蘗處理:每根株留存1枝、2枝、3枝和不去蘗(留存全部萌蘗)。每小區 60㎡採 完全逢機區集排列,各4重復。林分砍伐後萌蘗長出之前,各處理區內之平均根 株直徑無差異,根株直徑均以5-10cm者最多,11-15cm者次之,少於5cm或大 於15cm者最少。試區內每個根株之萌蘗在未去蘗前,各種處理之萌蘗數相差不 多,去蘗1.5年後,未經去蘗的根株,萌蘗數由每株平均9枝銳減至3.7枝,到6 年生長,未經去蘗者、留存3枝者、留存2枝者,各萌蘗之間競爭淘汰,平均每 根根株的萌蘗數相近,分別為2.2,1.9 和1.8枝。去蘗處理後,2-6年生萌蘗之 平均高生長,各處理間每年均無差異。胸徑生長和基徑生長初年(2.5-3年)呈極顯 著之差異,以未去蘗處理者累積生長值最大,5年生起各處理直徑生長之差異已 不顯著。6年生之萌蘗材積生長,未去蘗者亦比其他各種去蘗處理者為佳。試區 內林分之生長,去蘗後第1至5年,每年均呈穩定之成長,但第5年(6年生)各 處理林分生長均呈停頓狀態。故萌芽更新,生產薪炭材或紙漿材等工業用材以不 去蘗萌蘗為宜。可節省鉅額的造林成本。 |
英文摘要 | Coppice regrowth trial of K8 leucaena was initiated when the plantation at Nan-au (northeastern taiwan) was harvested at five years of age. Shoot retgrowth of four different thinnings was studied in four replications of 60㎡ plots by block complet randamized design. In the begining, the average diameter of stumps in each coppice treatment had no difference, and the diameters of most stumps were in the range of 5-10cm. Before thinning, shoot number per stump of each coppice treatment was almost the same, averaged within 7.8-9.0. The stumps of unthinned plots dropped to 3.7 after 1.5 years. Five years following coppicing (six years old of shoots), the numbers of shoot per stump in unthinned, 3-shoot and 2-shoot treatments had become 2.2, 1.9 and 1.8, respectively, according to the sever competition among the shoots. Average tree height of each coppice treatment had no difference from 2 to 6 years old plantation statistically. The diameter growth, both DBH and BD, however, revealed significant difference in each treament. The unthinned coppice had greatest values among the four. Moreover, the 6-year volume yield of the unthinned coppice surpassed other three treatments. Since 5 years old, diameter growth in four treatments had become similar. The overall growth of the trial plantation increased rapidly in the first 5 years, but was retard the following year. Therefore, in leucaena coppice management, for producing industrial wood and saving planting coost, no thinning is recommended. |
本系統中英文摘要資訊取自各篇刊載內容。