| 摘要: |
| 根据近几年大面调查的监测资料, 对长江口及邻近水域氮、磷营养盐的形态组成、时空分布及氮磷比的变动规律及其影响因素进行了分析研究。结果表明, 长江口及邻近水域中硝酸盐是水体无机氮存在的主要形态, 其约占总无机氮的90%, 无机氮含量河口高, 向东南方向愈来愈低; 从该水域总磷的形态组成来看, 磷营养盐主要以溶解态和颗粒态共存的形式存在, TDP 略高于TPP, 无机磷的平面分布与无机氮十分相似, 春季无机磷含量高于夏季; N/P 值变动范围大和平均值较高是该水域的主要特征, N/P 值与长江径流量的大小有关系, 夏季N/P 值比春季高, 综合分析来看, 磷营养盐和光照都有可能成为该水域浮游植物生长的重要限制因子。
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| 关键词: 长江口 化学形态 分布 营养盐 |
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| 基金项目:国家重点基础发展规划项目(2010CB429005); 国家社会公益性研究专项基金资助项目(2001DIA10014-4); 国家自然科学基金重点项目(50339040) |
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| Chemical compositions and distributions of nitrogen and phosphorus in Changjiang River Estuary and its adjacent east China sea |
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QUAN Wei-min,SHEN Xin-qiang,Han Jin-di,Chen Ya-qu
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| Abstract: |
| According to the monitoring results in recent years, chemical compositions of nitrogen and phosphorus and their distribution in Changjiang River Estuary and Adjacent East China Sea had been comprehensively investigated. Nitrate nitrogen was the main chemical species and occupied about ninety percent of inorganic nitrogen in the water area. The concentration of inorganic nitrogen was the highest in the estuary , but it became more and more dilute in the southeast sea area. Total phosphorus existed in two chemical forms incluidng dissolved and particulate phosphorus. The concentration of inorganic phosphorus in the spring was higher than that in the summer. Large variation and high average values of N/P were the main characteristics of this estuary and its adjacent sea area. A positive correlation existed between the N/P and the runoff of Changjiang River. In general, the phosphorus nutrient and illumination may be the limiting factors for phytoplankton growth.
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| Key words: Changjiang River Estuary and adjacent East China Sea chemical formation distribution nutrients |
