1994 Fiscal Year Final Research Report Summary
Studies on Quantitative Analysis of Tree Form of Woody Plants
| Project/Area Number |
04660037
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
園芸・造園学
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| Research Institution | Tokyo University of Agriculture |
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Principal Investigator |
HAMAYA Toshio Tokyo Univ.of Agriculture, Dept.of Landscape Gard.Prof., 農学部, 教授 (10011933)
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| Co-Investigator(Kenkyū-buntansha) |
HAMANO Chikayasu Tokyo Univ.of Agriculture, Dept.of Lands.Gard.Instruct., 農学部, 講師 (80109561)
KITAZAWA Kiyoshi Tokyo Univ.of Agriculture, Dept.of Lands.Gard.Ass.Prof., 農学部, 助教授 (30078167)
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| Project Period (FY) |
1992 – 1994
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| Keywords | Tree Species / Tree Form / Branching Habit / Shoot / Age / Quantification / Regression Equation |
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| Research Abstract |
An analytical method of quantification was applied to 80 species of woody plants, in order to find which elements contribute most for determining the image of the tree form characteristic to each of them. Fiftenn items were selected out among various characters of trunks, crowns, branches and foliage as well as the correlation between these characters. And every item was graded with two to five categories for all species, and the data thus obtained were subjected to the analysis based on the theory of quantification III (Hayashi's). Through the comparison of the category scores plotted into a two-dimensional graph, those 80 species were classified into four groups, i.e., those of deciduous broad-leaved, conifer, shrub and evergreen broad-leaved species. This classification also coincides well with that of the arrangement of the sample scores. Thus this suggests that the image of tree form of any species is determined mainly by the length and shape of trunks supporting the crowns and by the density and the shape of the outline of crowns.
The branching habit in the outer layrs of crowns were next examined on several representative broad-leaved tree species, and the following regression equations were determined ;
Between the length (y) of 1-3-yr-old branches and the number (x) of nodes on them :
Keyaki (Zelkova serrata) : y=k-a・b^x
Katura (Cercidiphyllum japonicum) : y=x/ (a+bx) *K,a, b : constant
Between the age (x) of branches and the number (y) of branchlets and nodes on them :
Keyaki (25-yr-old tree) : log_<10>=-0.648+0.7x
The equation curves of younger individuals fluctuate around this, suggesting the trend that they gradually converge to it with the age of trees.
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