南海“耗氧”及“贫氧”水体中消耗氧与硝酸盐和磷酸盐再生比值估算
Estimating the ratios between the nutrients and the apparent oxygen utilization in the South China Sea, China
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摘要: 通过对南海深海区硝酸氮、活性磷酸盐垂直分布的研究,分析了南海垂向耗氧和贫氧水体中硝酸氮、活性磷酸盐和表观耗氧量之间的关系.结果表明垂向上次表层、中层和深层水团中氧的消耗与营养盐再生比值均小于理论值,由此推断水体的混合为有机物再矿化提供氧的补充,但水团混合对水柱中硝酸氮、活性磷酸盐的影响不大,在次表层和中层水团中造成营养盐浓度变化主要是由于有机物再矿化的结果;在深层水团中有机物再矿化对水柱中营养盐梯度变化已不占主导地位.Abstract: Nitrogen and phosphorus are the elements which are the basis of phytoplanktons'growth.These elements are removed by the phytoplankton in the upper water.When the phytoplankton and some organic debris subside, these elements are regenerated by biologic oxidation,so the distributed characteristic of the contents is that the contents increase by degrees from upper to bottom in the water column.Of course,the distribution of nutrients is connected with different sea areas. Although the south sea is researched time after time and many data of nutrients are got,the study of the distribution and the regeneration of these parameters are short,so the data got by two cruises in June and November of 1998 are used to study some characteristics of those nutrients.On the basis of analyzing the vertical distribution of the nutrients,the relationship between AOU(apparent oxygen utilization)and those nutrients is got.The result shows that during organic matter regenerating,the mixing water otfers water body whose depth is about 75~1 000 mextra oxygen and the vertical variation of those nutrients in the water column are mostly influenced by regeneration.The efficiency of oxygen's supplement takes place between the depth of 1 000 m and 2 700 m,but the proportion of the regenerated nutrients in water becomes little.
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Key words:
- regeneration of nutlients /
- vertical distribution /
- AOU
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