巻号一覧
22 巻 (1961)
- 4 号 p. 193-
- 2-3 号 p. 49-
- 1 号 p. 1-
22 巻, 1 号
選択された号の論文の5件中1～5を表示しています
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加藤 武雄1961 年 22 巻 1 号 p. 1-8
発行日: 1961/03/30
公開日: 2009/10/16
ジャーナル フリーThe Ryüzan Volcano is one of the famous volcanoes of the Zao volcanic group. The surrounding area of this volcano is characterized by the abundance of lakes. Considering from the geological and geochemical points of view, these lakes are classified into the following three groups.
The 1st Group : This group consists of several lakes in the area covered by Kanno mud flow which extends at the western side of the Ryüzan Volcano. These lakes are represented by Haryü-numa, Sanbongi-numa, Sara-numa, Tade-numa and others. The water of this group shows neutral reaction respectively, that is, the pH values lie between 6.7 and 7.0.
The 2nd Group : Two lakes, i. e. Sakazuki-ko and Shiginoyachi-numa, belong to this group. They are found at the bottom of the Takayu explosion crater. Having contaminated by the Zao hot spring which gushes out here and there in the same explosion crater, they are rich in dissolved substances, and in particular the concentrations of SO42-, Cl- and Mn2+ are much higher than those of the 1st and the 3rd group. Moreover, it is needless to say that the chemical quality of Shiginoyachi-numa is influenced by the acidic river, the Harai-gawa, that joins to this swamp.
The 3rd Group : This group consists of two lakes, i. e. Dokko-numa and Katakai-numa. These are found in the area enclosed by the Ryüzan Volcano and the Zao Proper. The water of the lakes shows neutral reaction.抄録全体を表示PDF形式でダウンロード (1081K) -
鈴木 静夫, 二村 坦孝, 鈴木 重之1961 年 22 巻 1 号 p. 9-14
発行日: 1961/03/30
公開日: 2009/10/16
ジャーナル フリー神奈川県藤沢市にある大和醸造工場の廃水によって汚濁した川の微生物を調査し, 次の様な結果を得た。
1. 水の細菌数は工場の廃水の混入によって増加する.これは細菌類が水中の有機物を栄養源として繁殖するためで, このことは工場の廃水を用いた細菌類の培養実験によっても確かめられた.
2. 水の糸状菌類の量は, 廃水の流入によって著しく増加する. 棲息する菌類は特異な水に適応した Monilia sp., Mucor fragilis, Trichoaerma sp. が多量に見られる.
3. 水生菌類の分布は水の汚れの度合とかなりの相関があり, Aphanomyces sp. はきれいな水に, Leptomitus lacteusとPythium sp. とは汚れた水に多い.
4. 川底の微生物の現存量は, 工場の廃水の流入する個所に最も多い. それらは Beggiatoa, Sphaerotilus sp., Mouilia sp., Leptomitus lacteus, および Pythium sp. から成っている.抄録全体を表示PDF形式でダウンロード (574K) -
V. 曽原湖群の微生物相鈴木 静夫, 二村 坦孝1961 年 22 巻 1 号 p. 15-23
発行日: 1961/03/30
公開日: 2009/10/16
ジャーナル フリーThe microbiological studies were carried out in the Sohara Lake Group of Volcano Bandai, Fukushima Prefecture. The depths of water of these lakes ranged from 1.5 to 4.0 meters and their bottoms were covered with aquatic plants. The water temperatures were 1519°C and the pH values of surface water were neutral. The amount of mineral salts was very little except Lake Kurodoro-numa.
The bacteria were counted 105314 × 103/ cc. in water and 12335 × 104/ g in bottom mud, the largest amount in both the water and mud being observed in Lake Sohara-ko. The multiplication of bacteria was successful in the lake waters of the harmonic Sohara Group.
The zoospores of aquatic Phycomycetes were very scarce there were obtained only 4 species, among which Phytium sp. and Aphanomyces sp. predominated. The frequency of occurrence of fungi in the bottom mud ranged 5080%, and no saprolegniaceous fungi could be found in the reduced black mud of Lake Kurodoro-numa.
The fungi of 330-5660/l of water were counted and of 1005500/g in bottom mud. The fungi particularly abounded in the bottom mud of Lake Sohara-ko, but not observed in Lake Kurodoro-numa. The fungi were rich in the number of species in lake water, while any one species predominated in the bottom mud as was usually seen in the other lakes. According to the microbial productivity, the lakes of the Sohara Group may be ranged as follows :
Sohara-ko>Naka-ike>Osawa-numa>Ashio-numa>Kurodoro-numa.抄録全体を表示PDF形式でダウンロード (1126K) -
瀬野 錦蔵1961 年 22 巻 1 号 p. 24-30
発行日: 1961/03/30
公開日: 2009/10/16
ジャーナル フリーThe Yukawa River flows down through the region consisting of sulfur and pyrites which makes the waters acidic. Acidity of waters caused by oxidation of pyrites is taken place not only on the earth surface but also on the subsurface. The pH of waters are high in the snow season of winter and low in summer inversely the flow rates of river decrease. The oxidation of pyrites seems to be violent in summer it is caused not only by accelerated reaction at high temperature, but the concentrated high acidic waters retained in the interspaces among gravels.抄録全体を表示PDF形式でダウンロード (905K) -
上野 益三, 星野 隆一, 水野 寿彦, 田中 操1961 年 22 巻 1 号 p. 31-43
発行日: 1961/03/30
公開日: 2009/10/16
ジャーナル フリーOn the surface of the volcanic mud-flow at the northeastern foot of Mt. Shiratakayama ca. 14 km. west of the city of Yamagata in the Tohoku district, there are at an elevation of about 650 m. a number of shallow depressions, some of which are filled with water forming small lakes. Four of them are described in the present paper. They are smaller than 0.1 km2 in superficies, the longest one not exceeding 0.7 km. Although the lake-basins do not exceed 6 m. in maximum depth, most of them becoming deeply depressed in a small area. The morphological characteristics of the original lake-basins seem however to be fairy well preserved, nevertheless some parts of shore have been artificially changed. The morphometric data for them are summarized as follows : phometric data for them are summarized as follows :
Name of lake Ô-numa Aré-numa Koké-numa Magari-numa
Area (km2) 0.09 0.088 0.053 0.03
Maximum length (km) 0.7 0.5 0.4 0.36
Maximum width (km) 0.3 0.2 0.3 0.13
Length of shore-line (km) 1.9 1.3 1.2 0.8
Maximum depth (m) 5.7 5.7 4.4 1.0
Mean depth (m) 2.7 3.3 2.1 0.3
Volume (km3) 0.00024 0.00029 0.00011 0.00001
Shore development 1.79 1.23 1.46 1.33
The primary productivity of these lakes is extremely small in midsummer, only Koke-numa producing a pretty quantity of Microcystis aeruginosa. The plankton is composed chiefly of animals especially of rotifers. The typical eutrophic oxygen curves obtained in these lakes in midsummer suggest that, besides the morphological characteristics of the lake basins, more algal production may be expected in other seasons, such algae as certain diatoms occurring in early spring.
The region where these lakes lie seems to be poor in nutrition, i. e. an oligotrophic region. It therefore suggests that in these lakes the later rise in productivity which was initially very low has been checked relatively for a long period. This is shown by the sediments which are composed largely of silt the brackish grey gyttja composed mainly of organic materials is deposited in the deep depression of a limited area. The deep stagnated water cut off from circulation in the upper layer kept from wind agitation due to the surrounding topography of the lake will bring about the oxygen lost in summer, but it is not necessarily due to the high productivity. The low productivity in the two lakes, Koke-numa and Magari-numa, seem to be accerelated by their waters which are humose to a certain degree owing to humic materials brought in from the surrounding peaty deposits. So far as the oxygen curves are concerned, the lakes under consideration remind us to be eutrophic in certain stage succession. They are however not of true eutrophy but may be said to be “pseudoeutrophic” due to the morphological features of the lake-basins and the topographical peculiarities of the surrounding areas.抄録全体を表示PDF形式でダウンロード (4045K)
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