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ID 151
Eprint ID
151
FullText URL
Title Alternative
Studies on the Seasonal Variation of Mineral Constituents of Ash in Tree-leaves by the Emission Spectroscopy.
Author
Kuroyanagi, Shigeru
Abstract
This experiment was made on the seasonal variation of mineral constituents of leaves of Sugi(Chryptomeria japonica D. Don), Hinoki(Chamaecyparis obtusa Sieb. et Zucc.) and Kuromatsu(Pinus Thunbergii Parl.), representative trees for afforestration in Japan. The author used the emission spectroscopy using a graphite electrod, and Cd as an internal standard element and has determined such elements as P, Mg, Al, Fe, Ca, Si, B, Mn and Cu. The calibration line of these elements are shown on the Figures 1~3. The analysis of N and K was done in the ordinary method. The method of sampling is as follows: Numbers of sample trees: three trees in each kind Dates when leaves were collected: May 16, July 5, August 24, Oct. 13 and Dec. 2, 1960. (Sampling intervals of 50 days). The differences of means based on season are tested by the analysis of variance. The significant differences at 5 % level are shown by the mark *, at 1 % level are shown by the mark ** in Tables 1, 2, 3. The seasonal variation of mineral constituents of leaves are summerized as follows and shown on Figures 4~6. (1)The contents of N, K and P of one year leaves seem to decrease from spring to autumn, whereas in two or three year old leaves such a tendency may not be recognizable. (2)The contents of Ca, Mg and Fe seem to increase from spring to autumn. (3)The contents of Mn, B, Si and Al in leaves of Kuromatsu seem to increase from spring to autumn, however, of Hinoki and Sugi may be constant. The amount of Cu seem to decrease. (4)It may be summarized that the ash ratios of leaves are connected with the date when leaves are collected and the age of leaves, since the ratios become higher from spring to autumn and as the year of leaves advances. The changes of ash ratio seem due to the deposition of the large quantity elements such as Ca, Si and Mg in leaves. In two or three year old leaves these elements are considered as surplus and released by falling of leaves.
Published Date
1962
Publication Title
岡山大学農学部学術報告
Publication Title Alternative
Scientific Reports of the Faculty of Agriculture Okayama University
Volume
volume20
Issue
issue1
Publisher
岡山大学農学部
Publisher Alternative
Faculty of Agriculture, Okayama University
Start Page
23
End Page
36
ISSN
0474-0254
NCID
AN00033029
Content Type
Departmental Bulletin Paper
language
日本語
File Version
publisher
Refereed
False
Eprints Journal Name
srfa