| 摘要: |
| 1995年2月，用大口径采样器采集日本霞浦湖土铺湾和湖心柱状沉积物样品，在20°C恒温蔽光封闭条件下，研究了该湖沉积物需氧（SOD）速率及实验前后上覆水和间隙水中形态营养物浓度变化。结果表明，实验初期（0-5h），SOD速率随时间里线性上升，大于5h后呈非线性下降，对线性部分计算的SOD速率约在0.6-1.8mg/(m2*d)之间。实验发现，上覆水和表层间隙水中形态营养物Fe（Ⅱ），NH4+-N和溶解性有机氮含量在SOD实验前后有很大变化。 |
| 关键词: 沉积物需氧 速率 室内模拟 营养物 霞浦湖 |
| DOI： |
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| 基金项目:日本“霞浦湖底泥疏浚效果评价及对生态环境的影响”研究项目部分内容 |
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| STUDY ON THE RATE OF THE SEDIMENT OXYGEN DEMAND IN KASUMIGAURA LAKE |
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FAN Cheng-xin,Morihiro Aizaki,Takehiko Fukushima,Kazuo Matsushige
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1.Nanjing Institute of Geography & Limnology, The Chiniese Academy of Sciences,Nanjing, 210008;2.Faculty of Life and Environmental Science, Shimane University, Matsue, Shimane, 690, Japan;3.Regional Environmental Division of National Institute for Environmental Studies, Tsukuba, 305, Japan
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| Abstract: |
| Some sediment cores from Tsuchiura Bay and the lake center in Kasumigaura Lake, Japan, were collected with a large-size core sampler in February, 1995. The changes of dissolved oxygen in the sediment-water enclosed system were synchronously recorded and the variations in the nutrient concentrations in the overlaying water and interstitial water were also analyzed under the conditions of 20°C constant temperature and being sheltered from light The sediment oxygen demand (SOD) rates were calculated. The results show that the dissolved oxygen in the system decreased linearly with time in the initial stage (0 - 5h) and, however, gave a non-obvious decrease after 5h. The SOD rate in the lake was analyzed and evaluated to be around 0.6 - 1.8 mg/(m2×d) on the basis of the linear part. The formal nutrient contents, such as Fe(II), NH4+-N and dissolved organic nitrogen, were observed to change apparently in the overlying water and superficial interstitial water during the experiments. |
| Key words: Sediment oxygen demand, Rate, Indoor simulating, Nutrient, Kasumigaura Lake |
