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題 名 | 肖楠人工林之疏伐與林下闊葉樹栽植之效益評估=Assessing the Benefits of Thinning and Underplanting of Broadleaved Trees in a Taiwan Incense-Cedar Plantation |
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作 者 | 邱志明; 蘇聲欣; 唐盛林; 傅昭憲; | 書刊名 | 中華林學季刊 |
卷 期 | 47:2 2014.06[民103.06] |
頁 次 | 頁137-153 |
分類號 | 436.28 |
關鍵詞 | 肖楠; 疏伐; 林下栽植; 混合林; Taiwan incense-cedar; Thinning; Underplanting; Mixed plantation; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究試驗地點為位於台灣中部林業試驗所蓮華池研究中心之肖楠人工林。此林分於1958年造林,初期在12年生時(1970年)曾進行疏伐修枝試驗,之後於1993年重新規劃本試驗地,進行4種不同強度之疏伐試驗,並於1997-1998年進行4種闊葉樹種之林下栽植試驗,以期營造出複層之混合林。研究結果發現在不同疏伐強度下的肖楠平均胸徑及平均樹高,有強度>中度>弱度>對照之勢。疏伐後17年之胸徑定期生長量雖然差異不明顯,但每公頃胸高斷面積及材積量則差異極顯著,其中以對照區之單位面積林分定期生長量明顯偏小。另以林分株數枯死率而言,對照區高達27.4%、弱度6.8%、中度2.9%、強度0.8%。而在不同區集之間,林木胸徑、斷面積、材積生長差異皆顯著或極為顯著。林下栽植之4個樹種,於12年後以狗骨仔存活率最佳(77.8%),其次為烏心石(54.3%),長葉木薑子(45.4%),栲樹最差,未發現存活植株;而在平均胸徑上,亦以狗骨仔生長最佳(3.8 cm),顯著優於長葉木薑子(3.2 cm)及烏心石(2.4 cm)。另外從地被植物及天然更新樹木的 組成中也發現到,強、中、弱度疏伐的植物種類豐富度差異不大,但與對照區則有明顯差異,疏伐處理過後的地被植物組成比在未疏伐區豐富,但是天然更新樹木的情形則相反。此林分若能加強下木之後續撫育作業,並輔以適當的肖楠上木再次疏伐處理,應當可以提升林下樹木的生長與存活情形,保持地被植物之多樣性,並且促進肖楠上木之生產力與碳吸存效益,營造出更為成功的複層混合人工林。 |
英文摘要 | This study was conducted in a Taiwan Incense-cedar (Calocedrus formosana) plantation located at the Lienhuachih research center in central Taiwan. The plantation was established in 1958, once thinned and pruned in 1970, and then redesigned with a thinning trial of 4 different regimes (in 1993) and an underplanting trial of 4 broadleaved species (in 1997- 1998), aiming to establish a multi-layer mixed stand. The average DBH and tree height of these 52-year-old "C. formosana" trees showed a "heavy>medium>weak>control" pattern among different thinning regimes. Although there were no significant differences on the DBH growth, the per-hectare basal area and volume showed significant differences among the thinning regimes 17 years after thinning, and the stand growth in the control treatment was obviously less than that in the other thinning treatments. The tree mortality rates were 27.4%, 6.8%, 2.9% and 0.8% in the control, weak, medium and heavy thinning treatments respectively. Besides, the DBH, tree height and volume growth were significantly different among blocks. Of the 4 underplanting species, "Tricalysia dubia" showed the best survival rate (77.8%) 12 years after the planting, followed by "Michelia compressa" (54.3%), "Litsea acuminate" (45.4%), and "Castanopsis fargesii" which surprisingly had no surviving trees. On the average DBH, T.dubia showed significantly better growth (3.8 cm) than "L. acuminata" (3.2 cm) and "M. compressa" (2.4 cm). We also found that the species richness of both the ground-layer vegetation and the natural regeneration trees were similar among the heavy, medium and weak thinning regimes, but distinct from those in the control treatment. The ground-layer vegetation in the thinned areas was more diverse than that in the control treatment, while the situation was reverse for the natural regeneration trees. With adequate tending of the underplanted trees and re-thinning of the canopy "Calocedrus" trees, better growth and survival of the underplanted trees, desirable diversity of ground-layer vegetation and enhanced stand productivity (capability of carbon sequestration) can be simultaneously achieved, and thus, towards a successful multi-layer mixed plantation. |
本系統中英文摘要資訊取自各篇刊載內容。