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| 珠江口磨刀门咸潮及其对环境要素变化的影响 |
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石荣贵1,2, 龙爱民1, 周伟华1,3, 党爱翠1,2, 卢东伟1,2, 孙羚晏1,2
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1.中国科学院 南海海洋研究所热带海洋环境国家重点实验室;2.中国科学院 研究生院;3.中国科学院 海南热带海洋生物实验站
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| 摘要: |
| 于2011 年1 月25 日–1 月26 日小潮期间对磨刀门进行26 h 定点连续观测, 研究了咸潮对环境要素变化的影响。结果表明: 调查期间溶解氧没有明显的潮周期变化; NO-2、NH+4浓度随着观测时间的延长不断降低, 无明显潮周期变化; 底层SiO-4, NO-3浓度具有明显的潮周期变化, 且与底层盐度呈显著的正相关关系; 溶解无机磷(DIP)、重金属(Zn、Cd)的潮周期变化不明显。当河床剪切力大于0.226N/m2时, 发生明显的沉积物再悬浮作用, 并对营养盐与重金属的变化产生显著的影响。N, P, Si 比值分析结果表明, 磨刀门水域浮游植物生长受到潜在性的P 限制, 而咸潮上溯的加强将可能使这种营养盐结构发生变化。磨刀门受N、P 的污染仍不容乐观, 咸潮不利于污染物质的向海排出, 在潮流作用下有发生严重的二次污染的风险。 |
| 关键词: 磨刀门 咸潮 环境要素 影响 |
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| 基金项目:全球变化研究国家重大科学研究计划项目(2010CB951201);国家自然科学基金广东省联合基金项目(U0933005) |
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| Salt-wedge intrusion and its influence on environmental factors in the Modaomen Channel, Pearl River Estuary |
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| Abstract: |
| In order to investigate the effects of seawater intrusion on environmental factors, an anchor station survey was conducted during the neap tide from January 25 to 26, 2011. During the survey, the dissolved oxygen, PO3-4 and heavy metals (Zn, Cd) had no significant tidal variations. The concentration of NO-2, NH+4 decreased during the survey, while SiO-4, NO-3 in bottom water had concurrent variations with tidal circulation. When the shear stress was higher than 0.226 N·m2, there was significant sediment resuspension from the river bed. The atomic ratios of N, P, Si indicated that the phytoplankton growth was potentially limited by P, however, this condition might be changed by increasing seawater intrusion intensity. The N, P pollutions were still far from being safe for environment, the seawater intrusion was not helpful for pollutants elimination in Modaomen Channel, there was consistently a risk of secondary pollution under the role of tidal circulation. |
| Key words: Modaomen seawater intrusion environment factors impact |