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題 名 | 苗栗海岸砂丘木麻黃人工林之生長及林分生物量 |
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作 者 | 陳財輝; 呂錦明; | 書刊名 | 林業試驗所研究報告季刊 |
卷 期 | 3:1 1988.03[民77.03] |
頁 次 | 頁333-343 |
分類號 | 436.12 |
關鍵詞 | 人工林; 木麻黃; 生物量; 生長; 林分; 砂丘; 苗栗; 海岸; |
語 文 | 中文(Chinese) |
中文摘要 | 對栽植於苗栗縣後龍海濱砂丘之8年生木麻黃人工林實施樣區調查, 以分層平均木法選取樣木,並以層別刈取法測定樣木各項生長形質,再以相對生 長關係式估算林分生物量,由林分調查結果顯示,木麻黃樣區林分密度皆超過每 公頃5,000株,林分均呈現過密狀態,且其林分大部分皆由細長的個體所組成。 木麻黃樣木之生產構造中,葉量及枝量之垂直分布大部在地面高3.3∼6.3m之 間,幹、枝、葉、根量大致呈隨林木個體的增大而增加之現象。樣木之林冠投影 面積在0.580∼4.740m^2之間,由於本試驗地冬期之東北季風強烈,林木皆呈偏 冠生長,再加上林分密度過高,林木間相互凌壓的現象極為嚴重。樣木根系之分 布主要在地表下0∼120cm之間,其分布面積在0.784∼5.096m^2之間,亦呈隨 個體之增大而增加,樹體由於長年受到風力之吹襲,導致林木根系之生長方向與 樹冠生長方向相反。樣木各生長形質間之相對生長係數皆呈極顯著,以樣區林木 之胸徑為自變數,不僅可精確估算木麻黃林分各部位生物量,且其應用性較為廣 泛。由各相對生長關係式估算木麻黃8年生林分幹量(乾重)為36.42∼51.51ton/ha ,枝量(乾重 )為12.65∼20.21ton/ha,葉量(乾重)為0.99∼1.48ton/ha,根量(乾重) 為 10.21∼15.31ton/ha,幹量:枝量:葉量:根量之比約為59:22:2:17,林 分葉量偏低的原因或係由於東北季風吹襲致使林木之葉量大為減少,但木麻黃林 分之基本葉量為何,尚有待進一步調查。 |
英文摘要 | The growth and biomass production of an 8-year-old casuarina stand at Miao-Li county was studied. Stratified-clip technique was used to obtain the growth data of sample trees which were selected from various DBH classes of six study plots(20*30m). The stand biomass was estimated by allometric equations. The stand density of casurarina was over 5000 tress per hectare which resulted that most of the casuarina was composed of slender trees. Major vertical dry matter distribution of branches and leaves (branchlets) of the sampled trees are from 3.3-6.3m ground height. Root depth was generally between 0-120cm and the total root area was between 0.784-5.096 square meter. Total root area was normally propotional to the tree size. The crown projection was generally between 0.58-4.74 square meter. The crowns of most larger trees were oblique toward southwestern direction due to the northeastern monsoon which resulting the major root systems were toward northeastern direction. Correlation coefficient among different growth characters were found positive and highly significant. Estimations of the stem biomass (dry matter) ranged from 36.42 to 51.51ton/ha; the branches from 12.65 to 20.21ton/ha; roots from 10.21 to 15.31 ton/ha and the leaves from 0.99 to 1.48ton/ha. Althorgh casuarina is an evergreen tree, significantly lower leaf biomass might be due to the winter northeastern monsoon which causes leaffall. A careful study on the seasonal changes of the casuarina leaffall is necessary. |
本系統中英文摘要資訊取自各篇刊載內容。