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海洋科学  2012 

珠江口磨刀门咸潮及其对环境要素变化的影响

, PP. 86-93

Keywords: 磨刀门,咸潮,环境要素,影响

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Abstract:

于2011年1月25日–1月26日小潮期间对磨刀门进行26h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。

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