珠江口磨刀门咸潮及其对环境要素变化的影响  

Salt-wedge intrusion and its influence on environmental factors in the Modaomen Channel,Pearl River Estuary

作　　者：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] 

机构地区：[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,广东广州510301 [2]中国科学院研究生院,北京100049 [3]中国科学院海南热带海洋生物实验站,海南三亚572000

出　　处：《海洋科学》2012年第8期86-93,共8页Marine Sciences

基　　金：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)

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;NO2–、NH4+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SiO4–,NO3–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。In order to investigate the effects of seawater intrusion on environmental factors, an anchor station sur- vey was conducted during the neap tide from January 25 to 26, 2011. During the survey, the dissolved oxygen, PO43- and heavy metals （Zn, Cd） had no significant tidal variations. The concentration of NO2-, NH4＋ decreased during the survey, while SiO4-, NO3- in bottom water had concurrent variations with tidal circulation. When the shear stress was higher than 0.226 N.m-2, 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 condi- tion 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.

关 键 词：磨刀门 咸潮 环境要素 影响 

分 类 号：P342[天文地球—水文科学]