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浅海域の微生物学的研究-4 : 底質中の硫化物の挙動ならびに底層無酸素化との関係


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Title: 浅海域の微生物学的研究-4 : 底質中の硫化物の挙動ならびに底層無酸素化との関係
Other Titles: Microbiological Studies on Shallow Marine Areas―IV On the Liberation and Accumulation of Sulfides in Mud Sediment, and Its Relation to the Formation of Anoxic Layer
Authors: 藤田, 雄二 / 谷ロ, 忠敬 / 飯塚, 昭二 / 銭谷, 武平
Authors (alternative): Fujita, Yuji / Taniguti, Tadataka / Iizuka, Shoji / Zenitani, Buhei
Issue Date: Dec-1967
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.24, pp.79-88; 1967
Abstract: The liberation and accumulation of sulfides in the mud sediment are discussedon the basis of results of observation at Omura Bay in 1966 and 1967. In the bottom sediments, the sulfate-reduclng bacteria increase with the rising ofseawater temperature in summer, and play a major role in the production of sulfides. In the earlier period, free hydrogen sulfides liberated by bacterial actions are boundmainly with the iron which is present in the mud, and accumulated in bottomsediments but they are sometimes suspended in the bottom water as iron sulfidesdepending on the condition of seawater and bottom. In the latter period, freehydrogen sulfides, due to lack of available iron, either diffuse onto bottom wateror partially stay in the bottom sediments depending on the condition of the mud.These tendencies seem remarkable in pearl farm. Judging from the above facts and the vertical observations, it seems that anoxiclayer formation in the central part of this bay is caused by abiological or biologicaloxidation of sulfldes diffused in the bottom water from mud sediments. / 1966年と1967年の観測結果を基に,底質中の硫化物の挙動について,次のような考察を行なった. 大村湾内の底質中においては,夏季水温上昇と共に,硫酸還元細菌数が増加し,硫化物生成の主役を演じ,その結果発生した硫化水素は,前半期では固定・集積されるが,海況・泥質の状態によっては懸濁硫化鉄として浮揚する.また後半期では硫化水素は,易反応性鉄が不足するため,遊離の状態で水層へ拡散するか,あるいは底質の状況によってその中に一部未結合状態で存在する.これらの傾向は,真珠漁場で著しい.また,湾中央部無酸素層の生成は,これらの水層拡散,あるいは浮揚硫化物の酸化のために,溶存酸素が消費されるのが主因である.
URI: http://hdl.handle.net/10069/31360
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第24号

Citable URI : http://hdl.handle.net/10069/31360

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