陸水学雑誌

本邦主要湖沼の湖盆形態

堀江正治

1956 年 18 巻 1 号 p. 1-28
発行日: 1956/03/25
公開日: 2009/10/16

DOIhttps://doi.org/10.3739/rikusui.18.1

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Revised morphometric data for 312 Japanese lakes are given. They contain all the larger and deeper lakes, but a large number of the smaller and shallower bodies of water are also included when limnological studies were made. A great many data were recalculated or calculated for the first time. The lakes are arranged from the north to south according to the administrative districts (prefectures), under each of which they are listed alphabetically.

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奈良県郡山金魚池のプランクトンとC.I.E.表色法による水色との関係

渡辺仁治

1956 年 18 巻 1 号 p. 29-36
発行日: 1956/03/25
公開日: 2009/10/16

DOIhttps://doi.org/10.3739/rikusui.18.29

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Twenty gold-fish ponds in Kita-Koriyama, Nara Prefecture were studied in March, 1955, concerning the relation between the water colors and plankton.
The water colors were measured by the method of YAMAZAKI and WATANABE (1955), in which the principle of additive color mixture by using a MAXWELL'S disc was applied, and the results were indicated by the C.I.E. color language (Table 1). As to obtain the quantitative values of plankton as exactly as possible, the author calculated the extinction values measured by photoelectric photometer with compensating circuit, and substituted those values for the quantity of plankton (Fig. 1).
The results are as follows :
a) The correlation between the luminosities (Y) and excitation purities (Pe) in the water colors is shown as Y=0. 267Pe+0. 4 ; and the correlation coefficient (r) is 0. 895.
b) In the ponds, in which the extinction value is above 0. 20, each dominant wavelength (λD) and luminosity (Y) in water colors shows a negative correlation, but in those below 0.20, such a correlation cannot be seen. Moreover, the water color in the former is determined by the composing percentage of Scenedesmuswhich is dominant in every pond, while in the latter it is considered that the water colors are not only determined by pigments of plankton but also by physical factors. (Fig 3, Fig. 4).
From the above facts, it is difficult to consider that the plankton density corresponding to the excitation value of about 0. 20 is a critical point in the relation between the water colors and plankton quantities in gold-fish ponds.

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琵琶湖主湖盆の植物性プランクトン

根來健一郎

1956 年 18 巻 1 号 p. 37-46
発行日: 1956/03/25
公開日: 2009/10/16

DOIhttps://doi.org/10.3739/rikusui.18.37

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The phytoplankton of the main basin of Lake Biwa-ko consists of 35 species of algae, viz., Cyanophyceae 2, Diatomeae 15, Desmidiaceae 8, Chrysophyceae 3, Dinoflageliata 1, Chlorophyceae 5, and Heterokontae 1. Of the 35 species, the principal members are the followings : Aphahanocapsa elachista var. conferta (Cyan.), Melosira. solida (Diat.), Stephanodiscus carconensis (Diat.), Attheya Zachariasi (Diat.), Asterionella formosa (Diat., ), Closterium aciculare var. subpronum (Desm., ), Staurastrum dorsidentiferum var. ornatum (Desm.), Staurastrum paradoxum (Desm.), Staurastrum limneticum var. Burmense (Desm.), Cosmocladium constrictum (Desm.), Dinobryon cylindricum (Chrys.), , Dinobryon bavaricum (Chrys.), Mallomonas fastigata (Chrys.), Ceratium hirundinella (Dinofl.), Sphaerocystis Schroeteri (Chlor.), and Botryococcus Braunii (Heterok.). The Annual succession of the dominant species of phytoplankton is as follows Jan.Mar. Stephanodiscus carconensis→Apr. Melosira solida→MayAsterionella formosa→June, Attheya Zachariasi→July. Ceratium hirundinella→Aug. Sept. Pediastrum Biwae→Oct. Attheya Zachariasi→Nov.Dec. Melosira solida.In July and September the dominant form of the plankton is represented by a zoopinkter Eodiadtomus japonicus (Copepoda).

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