頁籤選單縮合
題 名 | 修枝對臺灣櫸幼林生長及節癒合之研究 |
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作 者 | 羅卓振南; 鍾旭和; 邱志明; | 書刊名 | 林業試驗所研究報告季刊 |
卷 期 | 10:3 1995.09[民84.09] |
頁 次 | 頁315-323 |
分類號 | 436.11 |
關鍵詞 | 臺灣櫸; 修枝; 節徑; 形狀比; 癒合; Zelkova serrata hay.; Pruning; Branch diameter; Form quotient; Occlusion; |
語 文 | 中文(Chinese) |
中文摘要 | 臺灣櫸幼林木樹幹分叉者甚多,影響主幹形成及林木形質極大。本研究目的即在探討該樹種最適之修枝度及觀測修枝傷口之癒合效應,以期生產高價之無節大徑材。供試林分為5年生臺灣櫸人工林,每公頃修枝株數為7000株,修枝高度係以林木樹高為標準,將修枝高度定為樹高之(A) 1/3;(B)1/2;及(C)完全不做修枝處理等三種。修枝4年後,結果如次: 1.5年生臺灣櫸若行修枝,其修枝高度可達樹高之1/2處,而對林分生長並無不良影響。 2.本試驗探討之幼齡林,其樹幹分叉之林木約佔總株數之82%,枝條節徑則界於1.0-8.0 cm之間,修枝後年,傷口癒合約77%,癒合偏低之原因係分叉較多且直徑粗大,不易癒合所致。因此建議臺灣櫸於3-4年生間,進行分叉幹修剪。 3.癒合節之觀測結果,節徑在3 cm以下者,修枝後3年均能完全癒合,節徑在5 cm以上者,則切除傷口除難以癒合外,尚且產生腐朽缺陷。顯示臺灣櫸修枝應於枝條直徑細小時行之,而節徑已逾5 cm以上者,則原則林分不應再予修剪。 4.5年生臺灣櫸經修枝後4年,對樹幹完滿程度無顯著之影響。 5.本研究於試驗期間,林木遭天牛及松鼠為害以致枯死者分別約佔總株數之14%及16%。因此,今後臺灣櫸之造林須考量天牛及松鼠之為及防治。 |
英文摘要 | The young Taiwan Zelkova is highly forking which affects its main stem formation as well as its wood quality greatly. Pruning, therefore, is required in tending young zelkowa plantations. The purposes of the preseant research are to study the optimum pruning intensity and the occlusion tendency after pruning. For each hectare of the five-years-old plantations located at Compartment No. 4, Pingtung Forest District, Taiwan Forestry Bureau 700 selected target trees were treated by (A) pruning up to 1/ 3 tree height; (B) pruning up to 1/2 tree height: and (C) no pruning. Four years after treatments the effects of pruning were analyzed and recorded as follow: 1. Trees of 5-years-old plantations can be pruned up to 1/2 of their heights without affecting the growth of plantations. 2. Eighty two percent of the trees in all plantations examined showed stem forking. The diameters of these stem forks were about 1.0-8.0 cm. Four years after pruning the percentage of occlusion was only about 77% due to the large number and size of the forks pruned. It is, therefore, suggested that the zelkova plantations be pruned at the age of 3-4. 3. Observations on occlusion after pruning showed that if the forks being removed were smaller than 3 cm in diameter good occlusion occured. On the other hand, if forks with diameter greater than 5 cm were pruned occlusion failed; and, as a result, wood decay occured. These observations suggest that pruning can be practiced only when the diameters off trees are less than 5 cm; and, when exceeded, no pruning treatment should be excersised on zelkova plantations. 4. Four years after pruning of the 5-years-old zelkova plantions no significant improve- ment on the stem form and, hence, the roundness was found on pruned trees. 5. During the four years experiment period the plantations were damaged by longicorn beetles and squirrels which caused a mortality, in terms of number of trees damaged, of 14% and 16%, respectively. The potential damages caused by these pests should be taken into account in establishing Taiwan Zelkova plantations in the future. |
本系統中英文摘要資訊取自各篇刊載內容。