Studies on the Release of Ammonium Nitrogen from the Bottom Sediments in Freshwater Bodies-I
Studies on the Release of Ammonium Nitrogen from the Bottom Sediments in Freshwater Bodies-I
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淡水体底部沉积物铵态氮释放研究-Ⅰ
DOI：
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发表时间：
1976
期刊：
影响因子：
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通讯作者：
A. Kawai
中科院分区：
文献类型：
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作者：
K. Kamiyama;S. Okuda;A. Kawai
在水生环境中，底泥在确定水质方面起着重要作用，特别是在浅层淡水水体中。大量来自有机物的营养物质经常积聚在底泥中并释放到水中，这可能导致富营养化。从这个角度出发，对琵琶湖赤井湾底泥利用环形水道向水中释放铵态氮进行了定量研究。作者在本研究中应用扩散过程理论，得到了上覆水静止时的扩散系数为5×10-6cm2/sec，当水流流速为1040 cm/sec时，扩散系数为2×10-5cm2/sec。为了解释泥浆中铵态氮垂直分布的变化，必须考虑泥浆中铵态氮由扩散部分和非扩散部分组成。测定了不同氨浓度下各泥浆样品中铵态氮的扩散部分。铵态氮随时间的增加速率与扩散过程理论估计的释放速率非常吻合。
In an aquatic environment, bottom mud plays an important role in the determination of the quality of water, especially in shallow freshwater bodies. A considerable amount of nutrients, originating from organic matter, are often accumulated in bottom mud and released into the water, which may cause eutrophication. From this point of view, a quantitative study has been carried out as to the release of ammonium nitrogen into the water from the bottom mud of Akanoi Bay in Lake Biwa by the use of an annular channel. The authors applied diffusion process theory in this study and obtained the diffusion coefficient of 5×10-6cm2/sec when overlying water was still and 2×10-5cm2/sec when it was moving with current velocity 1040 cm/sec. Ammonium nitrogen in mud must be considered to consist of diffusive and non-diffusive parts in order to explain the change in the vertical distribution of ammonium nitrogen in mud. The diffusive part of ammonium nitrogen in each mud sample with various ammonia concentrations was determined. The increasing rate of ammonium nitrogen with the lapse of time agrees well with the release rate estimated from the diffusion process theory.