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題名 | Building Allometric Models to Estimate Above-ground and Below-ground Biomass of Mahogany Sapling=建立大葉桃花心木幼林木地上部與地下部生長關係式 |
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作者 | 蔡正一; 張愷玲; 馮豐隆; | 書刊名 | 臺灣林業科學 |
卷期 | 27:3 2012.09[民101.09] |
頁次 | 頁229-238 |
分類號 | 436.25 |
關鍵詞 | 大葉桃花心木; 生長關係函數; 碳含量; 地上部; 地下部; Swietenia macrophylla King; Mahogany; Allometric relationship; Carbon content; Above-ground biomass; Below-ground biomass; |
語文 | 英文(English) |
中文摘要 | 近年來台灣的平地造林、農地造林、綠海計畫及愛台十二大建設等造林計畫都大量栽植大葉桃花心木(Swietenia macrophylla King),目前在台灣,大葉桃花心木人工林栽植面積將近2982.00 ha,其中125.40 ha種植於國有林班,而新化林場則種植了232.00 ha。根據京都議定書的規範,削減二氧化碳排放量,以減緩氣候變遷之衝擊,已為世界各國所共同關注的議題與努力的目標,大量栽植林木已成為目前主要的趨勢。生物量係指稱生物在生長過程中,乾物的累積重量,為了解生物資源之生產潛力及經營方向的重要指標。地上部生物量在生長關係函數中,是一個重要性態值,卻鮮少有文獻針對地下部生物量進行推估與建立生長關係函數式,主要原因為地下部生物量不易挖掘與量化。本研究係針對新化林場第二林班不同年齡的林分中,46株大葉桃花心木幼林木(DBH小於10 cm),建立地下部(根部)、地上部(樹幹、葉及枝)及全株林木的生長關係函數,期望以較容易測定的林木性態值(DBH、地徑(DSB)及樹高),取得不易量化的資料,如地上部、地下部及全株生物量等。建模結果顯示,DBH模式中的乘冪式,分別為W全株生物量 = 175.67×DBH2.29,W地上部生物量 = 112.21×DBH2.34及W地下部生物量 =61.65×DBH2.19較佳;迴歸判定係數R2分別為0.9692、0.9621和0.9610。大葉桃花心木幼林木含碳量情形為樹幹木材(45.83±0.92%) > 根部(45.09±0.89%) > 葉子(44.95±1.21%) > 枝條(43.74±1.09%) > 樹幹樹皮(42.64±1.01%),經營者可依據這些資訊,在不用砍伐林木情況下,推估與計算大葉桃花心木的生物量、碳含量比率及碳貯存量等。 |
英文摘要 | There are large areas of big-leaf mahogany (Swietenia macrophylla King) afforestation and reforestation plantations for reducing carbon dioxide due to climate change in Taiwan. In Taiwan, out of the total area of mahogany plantations of approximately 2982.00 ha, 125.40 ha is in national forests and 232.00 is at the Hsin-Hua Experimental Forest Station. Biomass is a plant attribute that accumulates over time. It is an important indicator of growth and is used in analysis and management processes. Above-ground biomass is the key parameter in many allometric relationships. However, there are few studies on below-ground biomass estimations of mahogany, for it is difficult to excavate and quantify these portions. The aim of this study was to establish an allometric relationship to estimate the above-ground (stem wood, stem bark, branches, and foliage) and belowground (roots) biomass using an easily measured value, such as the diameter at breast height (DBH), diameter at the stem base (DSB) and tree height (H). Forty-six mahogany saplings (0 cm ≤ DBH ≤ 10 cm), with different ages in the second compartment of this forest station, were used to establish the allometric functions of DBH and biomass, and functions of DSB and biomass. A significance test of the correlation was used to test the relationship between DBH and biomass in different sections, including foliage, branches, stems, above-ground, below-ground, and the entire tree. The DSB was also tested. The results showed that the power regression function was superior to other functions. The correlation between DBH and biomass was higher than the correlation between DSB and biomass. The allometric functions for the entire tree biomass, above-ground biomass, and below-ground biomass were W = 175.67×DBH^2.29 (R^2 = 0.9692), Wabove = 112.21×DBH^2.34 (R^2 = 0.9621), and Wbelow = 61.65×DBH^2.19 (R^2 = 0.9610), respectively. The carbon content of each part of mahogany trees was as follows: stem wood (45.83±0.92%), roots (45.09±0.89%), foliage (44.95±1.21%), branches (43.74±1.09%), and stem bark (42.64±1.01%). Managers can estimate the biomass, carbon content ratio, and carbon storage of mahogany without destroying trees. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。