| 摘要: |
| 通过对2007 年10 月至2008 年8 月期间天津近岸海水的理化因子和营养盐含量的检测, 分析讨论了天津近岸海域营养盐含量的时空变化、富营养化水平和营养级类型。结果表明, 2007 年10 月无机氮、无机磷和COD 均达到最高值。整个调查期间, 无机氮的含量较高, 普遍超过第四类海水水质标准,其中夏秋季高于冬春季, 可能是因为夏秋季陆源径流量较大所致。无机磷的含量相对较低, N/P 值显示无机磷可能成为海域浮游植物生长的限制因子, 营养级评价结果显示2008 年8 月海域处于磷中等限制潜在性营养状态。除了2008 年3 月蔡家堡外, 其余调查月份营养指数E 值均大于1, 水体处于富营养化状态, 其中2007 年10 月E 值最高, 达到了64。 |
| 关键词: 无机氮 无机磷 富营养化 营养指数 营养级评价 |
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| 基金项目:国家海洋公益性行业科研专项资助项目(200805069); 国家基金委创新研究群体科学基金项目(40821004); 中国科学院创新工程重要方向项目(KZCX2-YW-Q07-03); 国家海洋局海洋公益性重点项目(201005009); 天津市科技兴海项目(kx2010-4) |
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| Distribution of nutrients and eutrophication assessment in Tianjin Coastal Area |
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| Abstract: |
| The physical and chemical factors and the concentrations of ammonia, nitrite, nitrate, phosphorous, and COD of the Tianjin coastal seawater were investigated from October 2007 to August 2008. The spatial and temporal variations of nutrition, as well as the eutrophication level and type, were discussed. The concentrations of inorganic nitrogen, inorganic phosphorous, and COD reached the highest values on October 2007. Most of the nitrogen concentrations were higher than the forth-rate seawater standard of China. In addition, the nitrogen contents in summer and autumn were higher than those in winter and spring because of the contribution of surface runoff. The concentrations of phosphorus were relative low, and the N/P values indicated the phosphorus might become the limiting factors to phytoplankton growth. The results of eutrophication type assessment showed moderate phosphorus limited potential nutritional status of seawater in August 2008. The eutrophication indice of all the sampling months were higher than 1 except for the value of March 2008 in Caijiapu. The highest value of eutrophication indices, 64, occurred on October 2007. |
| Key words: Inorganic nitrogen inorganic phosphorous eutrophication eutrophication index eutrophication level evaluation |
