陸水学雑誌
Online ISSN : 1882-4897
Print ISSN : 0021-5104
ISSN-L : 0021-5104
7 巻, 2 号
選択された号の論文の6件中1~6を表示しています
  • 台湾の陸水 第4報
    宮地 傳三郎
    1937 年 7 巻 2 号 p. 55-63
    発行日: 1937年
    公開日: 2009/12/11
    ジャーナル フリー
    昭和11年12月から昭和12年1月にかけて行つた臺灣の湖沼調査の要鮎は次の通りである。
    1.湖の水位は何れも非常に低くなつてをるが,最低水位は自然状態では2月頃に現れるのが普通のやうである。
    2.水温は18.8~21.8℃で循環し,深層まで酸素が豊富であつた。日月潭の日潭湖盆及び珊瑚潭の深層水温がやや低冷で成層してをるのは,温度の低い河水が多量に入り,また底層水を盛んに排出されるためと思はれるが充分追究してはない。
    3.龍鑾潭以外の湖では泥温緑底層に比して何れも0.5~1.0℃の過高を示した。これは夏季受熱の影響が残つてをるためと説明される。
    4.日月潭・珊瑚潭・鯉魚池の底棲動物は極めて貧弱で,前2回の結果と併せ考へるとこのことは周年變りない特性と思はれる。
    5.龍鑾潭には貝類の生産量が頗る大きく,またその死殼もよく保存せられてをる。湖盆が淺いため特に貝殻帯は作らないが,それに相當するもので,死殼の多いこと本邦にその比を見ない。これは石灰含有量の大きいことから説明される。
  • II.擬底による浮島の生成
    羽田 良禾
    1937 年 7 巻 2 号 p. 64-67
    発行日: 1937年
    公開日: 2009/06/12
    ジャーナル フリー
    The writer observed that floating islets were derived from parts of the false bottom in one of many bog lakes in the Sphagnum-swamp of Kritappu on the eastern Pacific coast of Hokkaido.
    In the bog lake, in which floating islets were found, are observed several water plants whose stems are creeping over the false bottom, that is, thence, usually suspended independently in water 30-50 cm in depth, while the true bottom is 1.0-1.5m in depth. The false bottom of this hog lake is well developed and becomes firm. On account of the action of decomposition gases accumulated under the false bottom, parts of it are risen to the water surface as floating islets. The colour of the false bottom is dark brown, but floating islets have the black surface, on which a few plants sometimes grow. The influence of the false bottom upon water temperature was not observed at the time of the reseach made in December, 1936.
  • 楠木 義明
    1937 年 7 巻 2 号 p. 68-77
    発行日: 1937年
    公開日: 2009/06/12
    ジャーナル フリー
    Harutori is a gourd-shaped lake with a longer axis of 2000m and shorter axis of 200-400m, and is about 400m distant from the sea. The greatest depth of the lake is 8.5m. In the present paper are given the results of observations made on May 10, and July 13, 1936 respectively, and are also discussed the results obtained by Mr. Yoshine Hada, to whom I am de ply indebted.
    The water of this lake was greenish brown and turbid, transparency being only 1m. Owing to the unequal vertical distribution of salts, the metalimnion was very well developed even during the periods of the autumnal and vernal circulations, the salinity of the bottom water being ten times that of the surface. The temperature of the bottom water always remained about 9°C throughout the year, while that of the surfarce varied from 0° to 17°C, or more (fig. 1). The water was alka-line in the epilimnion and neutral in both meta- and hypolimnion, , a marked depression being found in the stratum between 3.5 and 4.5m (table 1 and fig. 2) The surface Water was saturated with oxygen, while sudden decrease was taken place below 3m; below 4.5m it was replaced by hydrogen sulphide (fig. 3), of. which an enormous amount (665 mg/l) was detected in anaerobic zone where it was reduced from sulphate (table 3). The other biochemical stratifications are as follows : alkalinity and hardness increase in the metahmnion; anaerobic strata are completely devoid of phosphate, nitrate and nitrite, but there is a great amount of ammonia (103 mg/l) in the bottom water (table 4).
    Such unrivalled amounts of H2S and ammonia dissolved in the hypolimhion and some other extraordinary properties observed in the lake caii he attributed to the permanent stagnation of the bottom water.
  • 山崎 正武
    1937 年 7 巻 2 号 p. 78-84
    発行日: 1937年
    公開日: 2009/06/12
    ジャーナル フリー
  • 上野 益三
    1937 年 7 巻 2 号 p. 85-87
    発行日: 1937年
    公開日: 2009/06/12
    ジャーナル フリー
  • 1937 年 7 巻 2 号 p. 87-88
    発行日: 1937年
    公開日: 2009/06/12
    ジャーナル フリー
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