頁籤選單縮合
題名 | 疏伐作業影響輪伐期長短之研究=Impacts of Thinning Operations on Optimal Rotations for Taiwania Plantations |
---|---|
作者 | 劉浚明; | 書刊名 | 中華林學季刊 |
卷期 | 30:1=116 1997.03[民86.03] |
頁次 | 頁71-84 |
分類號 | 436.715 |
關鍵詞 | 輪伐期; 疏伐作業; Rotation; Thinning operation; |
語文 | 中文(Chinese) |
中文摘要 | 本論文根據疏伐作業影響人工林胸徑生長與材積成長之結果,以及木材價格函數與撫育成本等資料,來探討疏伐作業對於人工林各種輪伐期之影響程度。所涵蓋之輪伐期種類包含自然輪伐期、工藝輪伐期、材積收穫量最大輪伐期、金錢淨收穫最大輪伐期、淨現值最大輪伐期、以及林地期望價最大輪伐期。首先建立各種輪伐期之決策模式,接著採用末疏伐林分與疏伐林分之生長收穫函數、及木材價函數與撫育成本,分析並比較末疏伐林分與疏伐林分之輪伐期的差異。結果顯示除了與木材價格無關的自然輪伐期和工藝輪伐期之外,疏伐作業將會延長材積收穫量最大輪伐期、以及與價格有關的各種輪伐期,同時增加林分材積收穫量與金錢效益。除此之外,本文中所得出的各種輪伐期長度可以作為臺灣杉人工林經營中伐採規劃之參考。 |
英文摘要 | This paper concerns with the impacts of thinning operations on various types of rotation age, based on the results of growth and yield study on thinned stands. The types of rotatin age include natural rotation, technial rotation, maximum yield rotation, maximum net revenue rotation, maximum net present value rotation, and maximum bare land expectation value rotation. First, the decision models for various types of rotation were developed, then yield models for thinned and unthinned stands, a stumpage price model, and silvicultural costs were used to determine the rotation age for unthinned and thinned stands, respectively. Results shown that except for the natural and technical rotations, the thinning operations could increase the time period of most types of rotation. Besides, the calculated rotation age for thinned and unthinned stands was able to provide decision makers the management criteria for scheduling harvest. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。