| 长江口水域营养盐的限制性研究 |
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| 引用本文： | 刘浩,许文珊.长江口水域营养盐的限制性研究[J].上海海洋大学学报,2013,22(5):720-725. |
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| 作者姓名： | 刘浩 许文珊 |
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| 作者单位： | 上海海洋大学 海洋科学学院;上海海洋大学 海洋科学学院 |
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| 基金项目： | 上海市教育委员会创新项目（12ZZ165） |
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| 摘 要： | 根据2004年2月和8月调查资料分析了冬夏两个季节硝酸盐（NO3-N）、铵盐（NH4-N）和活性磷酸盐（PO4-P）在长江口水域表层和底层浓度的分布特征。结果表明：新营养盐（硝酸盐）浓度大致呈现近岸高，向外海方向逐渐降低的分布趋势；再生营养盐（铵盐和磷酸验）夏季的底层浓度值高于表层。一方面藻类在夏季的光合作用强烈，对上层水体的营养盐消耗很大；另一方面，底层水体得到海底沉积物中再生的营养盐的补充，表底层营养盐的此消彼长使得底层营养盐含量明显高于表层。冬季，由于水体混合强烈，表底层营养盐的分布趋于均匀。进一步以氮磷浓度比考察长江口水域营养盐的限制特性发现：近河口区为磷限制，向海方向逐渐过渡成为氮限制。营养盐限制性的变化过程与长江冲淡水和黑潮变异的相对强弱密切相关。
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| 关 键 词： | 营养盐 浮游植物 冲淡水 沉积物 长江口水域 |
| 收稿时间： | 2013/3/25 0:00:00 |
| 修稿时间： | 2013/5/28 0:00:00 |
Study on the Nutrient Limitations in the Yangtze River Estuary |
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| Liu Hao and Xu Wenshan.Study on the Nutrient Limitations in the Yangtze River Estuary[J].Journal of Shanghai Ocean University,2013,22(5):720-725. |
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| Authors: | Liu Hao and Xu Wenshan |
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| Institution: | College of Marine Sciences,Shanghai Ocean University,College of Marine Sciences,Shanghai Ocean University |
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| Abstract: | Based on the investigations in February and August, 2004 in the Yangtze River Estuary, the concentration distributions of nitrate (NO3-N), ammonium (NH4-N) and phosphate (PO4-P) in the bottom and surface layers are presented for analysis. It is found that the concentration of the new nutrient (nitrate) shows the high level near the coast and gradually decreases toward the continental shelf in two seasons; whereas the concentration of the regenerated nutrients (ammonium and phosphate) show the high level in the bottom layer comparable to that in the surface layer in summer. Since the phytoplankton is the most active in summer, the nutrients in the upper layer are consumed largely due to the photosynthesis. In the meanwhile, the nutrients regenerated on the sea floor can reenter the bottom layer of the water column and make up the nutrient content. Therefore, the concentrations of regenerated nutrients are higher in the bottom layer than that in the surface layer. In winter, the nutrients are distributed in the similar way in the surface and bottom layers due to the strong vertical mixing in the water column. The further research on the nutrient limitation, according to the Redfield theory, shows that the phosphorus limitation dominates in the river mouth, and such a trend gradually shifts to the nitrogen limitation toward the continental shelf. The variation of the nutrient limitation may be dependent on the relative strength between the Changjiang diluted water and the intrusion branch of the Kuroshio Current. |
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| Keywords: | Nutrient Phytoplankton Changjiang Diluted Water Sediment Yangtze River Estuary |
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