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タイトルヨミ
シラカシ ジュカン ダンメン ノ ヒョウカホウ ニツイテ ダイ1ポウ シュウイ オヨビ チョッケイ ソクテイ ニヨル スイテイ ダンメンセキ ノ ゴサ
日本語以外のタイトル
On the Appraisal Methods of Cross-Section of "Shirakashi" (Quercus myrsinaeoflia Blume) Stem(I) : The Error of Estimated Cross-Sectional Area Based on Girth or Various Diameter Measurments
ファイル
言語
日本語
著者
安井 鈞
内容記述(抄録等)
The author studied on the fittness and the errors among estimated cross-section areas of a tree, calculated by some usual estimation formulae, in which a cross-section figure is assumed as a circle.
1 . Samples were 44 disks taken from shoots of Quercus myrsinaefolia of some coppice forests in Shimane Prefecture.
2 . Measurements were taken at the height of 0.00 m (section I), 0.73 m (section II), 1.46 m (section III), as follows;
i ) Precise cross-section areas, measured by a planimeter.
ii) Diameters in 18 directions, every ten degrees, on a disk, so that he could find a maximum and a minimum diametet and a pair of two diameters crossing at right angle.
iii) Girths, measured by a tapeline, supplemented by a curvimeter.
3 . As a value D in the estimation by a formula ^π_4D^2, he picked up following values,
D_1 : a diameter in a random directon.
D_2 : the arithmetic mean of a pair of diameter crossing at right angle.
D_3 : the geometric mean of a pair of diameter crossing at right angle.
D_4 : the mean of the maximum and minimum diameter.
D_5 : the mean of a pair of the maximum and a crossing diameter.
D_6 : the mean of the minimum and a crossing diameter.
To check the fittness of these of estimations, the author carried a regression analysis, and he found,
i ) When it is a = 0, b = 1, the fitiest index for the section III and II might be the mean of a pair of the minimum and the crossing diameter.
ii) In view of convergency of variances around a regression line, the fittest were the mean of the maximum and the minimum diameter for the section III, and the geometric mean of a pair of diameters crossing at right angle for the section I.
掲載誌名
島根農科大学研究報告
10
開始ページ
(A)141
終了ページ
145
ISSN
05598311
発行日
1962-03-31
NCID
AN00108241
出版者
島根農科大学
出版者別表記
The Shimane Agricultural College
資料タイプ
紀要論文
部局
生物資源科学部
備考
A,Bを含む
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