乳山湾东流区滩涂贝类养殖环境中自身污染现状分析

根据2004年6、8和10月对乳山湾的3个航次的调查资料,研究了乳山湾总氮、总磷、总有机碳的平面分布和垂直分布。结果表明,TOC、TP的平均含量及其各层次含量均未超标,TN部分超标。无论平面分布还是垂直分布,TOC、TP、TN的含量季节差异不明显,但具有明显的地域特征:TP、TN、TOC最大值,集中在污水排放口和高密度养殖区;垂直分布,大部分站位表层以下垂直变化基本趋于平稳,各层次含量基本相近;养殖区与非养殖区相比,TOC、TP的平均含量及其各层次含量基本表现为养殖区大于非养殖区,但二者相差不大。结果显示,乳山湾集约化贝类养殖对其滩涂养殖环境尚未造成积累性自身污染。

Self-pollution status in shellfish mudflat culture areas of the Rushan Bay East Valley

On the basis of the data from 3 cruise investigations in Rushan Bay East Valley from July to December, 2004, studies were conducted on the horizontal and vertical distributions of TN, TP and TOC in the sediment of Rushan Bay East Valley. The results indicated that the TOC and TP contents in sediment were all lower than the evaluation standards, while TN contents in sediment exceeded the standard partially. In addition, TN, TP and TOC did not exhibit much seasonal differences either in the horizontal distribution or in the vertical distribution, obvious regional character excepted. All the maximal values of TN, TP and TOC contents in sediment were fixed on the areas adjacent to sewage discharge mouth or on the densely culture areas. As for the vertical distribution, TN, TP, TOC contents at different depth of sediment were approximately similar. Although the average contents of TOC and TP in sediment in culture areas were basically higher than those in non culture areas, the discrepancy between them were very small. To sum up, we presumed that the intensive shellfish culture in Rushan Bay had not resulted in the consequence of self-pollution.