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題 名 | 臺灣杉人工林最適林分經營之研究=A Study of Optimal Stand Management for Taiwania Plantations |
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作 者 | 李國忠; 陳毓華; 魏名聰; | 書刊名 | 國立臺灣大學農學院實驗林研究報告 |
卷 期 | 14:4=230 2000.12[民89.12] |
頁 次 | 頁245-258 |
分類號 | 436.25 |
關鍵詞 | 生長模式; 淨現值; 土地期望值; Growth model; Net present value; Soil expectation value; |
語 文 | 中文(Chinese) |
中文摘要 | 臺灣杉(Taiwania cryptomerioides Hayata, Taiwania)為臺灣固有之優良樹種,生長迅速,林相整齊,是具推廣潛力的高價值造林樹種。多年來,有關臺灣杉之經營方法與最適輪伐期之決定,未能有完整資訊可循,本文根據臺灣杉永久樣區調查之生長資料,以多元迴歸分析配試生長模式,並以臺灣杉經營之成本收益模式,推估不同經濟疏伐下林分之經濟效益,同時應用經濟評估中之最大淨現值及最大土地期望值求出林分之最適輪伐期,更進一步應用動態規劃,模疑最適疏伐及疏伐強度,進而求得最適輪伐期。結果顯示,在3.5%之實質利率下,經營臺灣杉仍為一有利事業,而最佳經營方法則是中間實施經濟疏伐。此最佳經營方法不僅提高林木品質,延長輪伐期,且對經濟效益有明顯的提昇。 |
英文摘要 | This paper aims at the interrelations and effects among the decisions under different management methods and periods to obtain the intensity and the timing of optimal thinning and furthermore to obtain the optimal rotation. Results show that under 3.5% real discount rate, the management of Taiwania plantations is profitable, and the best management choice is to treat intermediate economic thinning. This choice not only raises the quality of wood, prolongs the rotation but also has a significant increment on economic benefits. This study corresponds with the characteristics of the growth of Taiwania plantations, and provides a proper renewing stand structure suitably for forestry mangers to improve the stand growth rate and to increase economic revenues. |
本系統中英文摘要資訊取自各篇刊載內容。