Comparison of the branch structures of six common broad-leaved trees
Date Issued
2006
Date
2006
Author(s)
Kuo, Wei-Wu
DOI
zh-TW
Abstract
The purpose of this thesis is to analysis the horizontal branches of 6 broad-leaved trees on campus, which are Alstonia scholaris, Bauhinia blakeana, Cinnamomum camphora, Ficus microcarpa, Koelreuteria henryi and Terminalia mantaly. The selected horizontal branches are at the angle between 70° and 110° to vertical and the diameter of branch is less than 5 cm. The position of pith, eccentricity, distribution of gelatinous fiber, fiber domain, fiber thickness of cell wall and ratio of lumen to whole cell were investigated.
The pith positions of the branches between 5 and 25 cm from K. henryi and T. mantaly are near the upside, but those from A. scholaris, B. blakeana, C. camphora and F. microcarpa do not have constant position. The eccentricity of the branches of A. scholaris, whose spans to main stem between 5 and 25 cm, declined gradually, but those eccentricity from B. blakeana, C. camphora, F. microcarpa, K. henryi and T. mantaly are not constant. Gelatinous fibers in branches of A. scholaris were not found. The gelatinous fibers from B. blakeana and C. camphora are located both upside and downside, and those from F. microcarpa, K. henryi and T. mantaly are at the upside. The fiber areas that are from the downside of K. henryi are bigger than that of upside, but the fiber area from A. scholaris, B. blakeana, C. camphora, F. microcarpa and T. mantaly do not have difference between upside and downside. The thickness of cell wall from the upside of A. scholaris and T. mantaly is thicker than downside. The thickness of cell wall from B. blakeana and C. camphora is alike between upside and downside side. The F. microcarpa and K. henryi have different results on branches. The ratios of the lumen to the whole cell from the upside branch of A. scholaris, K. henryi and T. mantaly are bigger than those of downside. Those of C. camphora are equal between upside and downside. However, the branches of B. blakeana and F. microcarpa are difficult to conclude.
The results of anatomic analyses concluded that the branches of 6 broad-leaved trees are polymorphic. Besides our results, other experiments such as growth strain test and chemical elements analysis are needed to understand the formation of tension wood in the broad-leaved trees.
Subjects
闊葉樹
解剖特徵
黑板樹
豔紫荊
樟樹
榕樹
小葉欖仁
髓心位置
偏心率趨勢
膠質纖維分布區域
纖維細胞面積
纖維細胞壁厚度
纖維細胞腔佔整個細胞比例
broad-leaved trees
Alstonia scholaris
Bauhinia blakeana
Cinnamomum camphora
Ficus microcarpa
Koelreuteria henryi
Terminalia mantaly
the position of pith
eccentricity
distribution of gelatinous fiber
fiber domain
fiber thickness of cell wall
ratio of lumen to whole cell were investigated
Type
other