棲蘭山地區檜木林其林木生物量及生長量之估算

Estimate of Tree Biomass and Growth of Hinoki Stand in Chilanshan Area of North-Eastern Taiwan

黃菊美(Chu-Mei Huang) ； 杜清澤(Chin-Tzer Duh) ； 張世杰(Shih-Chieh Chang) ； 林國銓(Kuo-Chuan Lin)

《中華林學季刊》 45卷2期 (2012/06) Pp. 137-150

https://doi.org/10.30064/QJCF.201206.0001

摘要

台灣地區的檜木為經濟價值很高的樹種。本研究以伐木實測法估算棲蘭山地區天然更新檜木林，其林木地上部和地下部生物量的分布、根莖比和轉換係數等參數、林木的生長量等，做為經營管理檜木林的基礎資料。結果顯示檜木平均根莖比為0.366，材積地上部生物量轉換係數為0.546 Mg m^(-3)，材積全株生物量轉換係數為0.797 Mg m^(-3)。本研究林分僅為40-50年生，其各參數是否已達穩定，仍有待證實。經樹幹解析發現優勢木與中勢木的材積連年生長和平均生長皆呈上升趨勢，尚未減緩，且連年生長量皆高於平均生長量。但被壓木不同，材積平均生長遠低於優勢木和中勢木，生長已受到壓抑，因此林分有必要加以撫育，以便促進中、優勢木之生長。

關鍵字

天然下種更新林 ； 根莖比 ； 轉換係數 ； 連年生長 ； 平均生長

並列摘要

Hinoki is a native tree species with high economic value in Taiwan. The harvest method was selected to estimate above- and below-ground biomass, parameters such as root/ shoot ratios and conversion factors, and growth of Hinoki at natural seedling regeneration stands in Chilanshan area of northeastern Taiwan, which served as the base for the management of Hinoki stands. The results were that the estimated root/shoot ratio was 0.366, and the conversion factors of aboveground and entire-tree biomass were 0.546 and 0.797 Mg m^(-3), respectively. However, it needs to be verified if those coefficients were stable, since the stands were only at ages between 40 and 50. Curves of current annual volume increment and mean annual volume increment of dominant and middle trees increased with age and were not steady yet. And all current annual volume increments were higher than mean annual volume increments. The mean annual volume increments of suppress trees, of which the growth was inhibited, increased only a little with age, and were much lower than those of the dominant and middle trees. It's necessary to manage intensively the stand in order to stimulate the growth of dominate and middle trees.

並列關鍵字

Natural seedling regeneration stand ； Root/shoot ratio ； Conversion factor ； Current annual increment ； Mean annual increment