Sediment oxygen demand in Hiroshima Bay

• Published in: Water research (Oxford) Vol. 28; no. 2; pp. 385 - 393
• Main Authors: Seiki, Tohru, Izawa, Hirofumi, Date, Etsuji, Sunahara, Hiroshi
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 1994; Elsevier Science
• Subjects: Animal, plant and microbial ecology; Biological and medical sciences; biological respiration; eutrophication; Fundamental and applied biological sciences. Psychology; Hiroshima Bay; Marine; Microbial ecology; oxygen consumption; oxygen deficit; sediment; Seto Inland Sea; SOD; Various environments (extraatmospheric space, air, water); Inland Sea; INW, Japan, Honshu, Hiroshima Prefect., Hiroshima Bay; biological respiration; oxygen deficit; eutrophication; oxygen consumption; Hiroshima Bay; Seto Inland Sea; SOD; sediment; Marine environment; Laboratory study; Seasonal variation; Oxygen consumption; Environmental factor; Sediments; Eutrophication; Cell respiration
• ISSN: 0043-1354; 1879-2448
• DOI: 10.1016/0043-1354(94)90276-3

Effects of environmental factors, depth and layer thickness of sediment, organic matter, reducing substance, oxygen concentration and temperature, on sediment oxygen demand (SOD) were examined by laboratory experiments. Apparent effects on the SOD rates were recognized from each factor, except for the layer thickness and organic matter content in sediment. The SOD rates varied with sediment depths, which was attributed to the reducing substances in sediments. Temperature ( T) revealed the most marked effect among these factors, and SOD rates increased linearly with temperature in the range of 10–30°C. Oxygen concentration in overlying water did not influence the SOD rate when it was over 2–3 mg/l, but influenced below this concentration. The SOD rates in Hiroshima Bay, measured by both an in situ chamber (bell jar) and a laboratory method with intact cores, agreed well with each other and ranged from 0.10 to 0.61 g O 2/m 2/d, with a mean of 0.3–0.4 g O 2/m 2/d on an annual basis. The rates in summer and autumn were twice those in winter. It also became evident in this study that SOD rates in Hiroshima Bay were mainly controlled by biological consumptions from summer to autumn and by chemical consumption of the reducing substances during winter and spring.