Sediment oxygen demand in Hiroshima Bay
Sediment oxygen demand in Hiroshima Bay
复制标题
广岛湾沉积物需氧量
DOI：
10.1016/0043-1354(94)90276-3
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发表时间：
1994
期刊：
影响因子：
12.8
通讯作者：
H. Sunahara
中科院分区：
文献类型：
--
作者：
Tohru Seiki;Hirofumi Izawa;Etsuji Date;H. Sunahara
通过室内实验，研究了环境因素、沉积物深度和厚度、有机质、还原物质、氧气浓度和温度对沉积物需氧量的影响。除表层厚度和底泥有机质含量外，各因子对超氧化物歧化速率均有明显影响。随着沉积物深度的不同，超氧化物歧化酶的活性也不同，这与沉积物中的还原物质有关。温度(T)的影响最为显著，在10~30℃温度范围内，超氧化物歧化酶活性与温度呈线性关系。上覆水中氧浓度高于2~3 mg/L时，对超氧化物歧化酶活性没有影响，但在此浓度以下对超氧化物歧化酶活性有影响。广岛湾超氧化物歧化酶活性的测定结果与实验室完整岩心测定法一致，其变化范围为0.10~0.61g O2/m2/d，年平均值为0.3~0.4g O2/m2/d。夏季和秋季的这一比例是冬季的两倍。这项研究还表明，广岛湾的超氧化物歧化速率主要受夏季到秋季的生物消耗和冬季和春季还原物质的化学消耗控制。
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 anin situchamber (bell jar) and a laboratory method with intact cores, agreed well with each other and ranged from 0.10 to 0.61 g O2/m2/d, with a mean of 0.3–0.4 g O2/m2/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.