长期倾倒疏浚物对珠江口内伶仃岛东南倾倒区环境的影响  

Environmental Impact on the Marine Dumping Site for Long-term Dumping Dredged Material in the Southeast of the Neilingding Island,Zhujiang estuary

作　　者：江志华[1] 蔡伟叙[1] 胡希声[1] 

机构地区：[1]国家海洋局南海环境监测中心,广州510300

出　　处：《广州环境科学》2007年第4期24-31,共8页Guangzhou Environmental Science

基　　金：国家海洋局南海分局科学技术局长基金资助项目(0640)

摘　　要：依据1989～2005年间对内伶仃岛东南倾倒区的监测资料，分析了该倾倒区及其邻近海域的环境变化特征，探讨了长期倾倒疏浚物对该倾倒区环境的影响。其环境变化特征为：①倾倒区内淤积严重，水深持续变浅；②海水质量呈下降趋势，影响水质的主要因子是无机氮和无机磷；③表层沉积物质量好转，倾倒区表层沉积物中各污染物平均含量均比周围海域低；④海水中叶绿素a含量主要随季节变化，浮游植物和浮游动物种类比较丰富，群落结构较稳定，底栖生物优势类群更替明显，生物量和栖息密度变化大，倾倒区的底栖生物种类和数量较周围海域低，底栖生物体内部分污染物质含量呈下降趋势。长期倾倒疏浚物对内伶仃岛东南倾倒区水深和底栖生物群落产生不利影响，但对表层沉积物质量和底栖生物体内污染物含量可能产生了一定的有利影响。The environmental impact associated with the long and uninterrupted disposal of large volumes of moderately contaminated dredged material from the port of Shenzhen city was studied at nearby dumping sites in the Southeast of the Neilingding island,Zhujiang estuary. Based on a great deal of observed data and information obtained from the marine dumping ground in the Southeast of the Neilingding island since 1995,the environment change in the Zhujiang estuary is studied by principal component analysis. The main results are as follows： （1） The depth of this dumping ground decrease from 1989 to 1998. （2） The aquatic environment quality shows a downtrend from 1995 to 2005. The soluble phosphate and dissolved inorganic nitrogen are the main pollutants in this area. （3） The surface sediment environment quality shows a uptrend from 1995 to 2005. （4） The content of Chlorophyll-a in sea water shows a seasonal angd annual variation. The diversity of phytoplankton and zooplankton are quite rich in the study area,with a stable community structure. The benthic community, trend stably after dumped. The main pollutant in the benthos decreased from 1995 to 2005. The dredged materials dumped in a long period shows obvious significant impact to the sediment quality and the benthic community structure and the pollutants content in the benthic organic.

关 键 词：疏浚物 倾倒 环境影响 长期 

分 类 号：X55[环境科学与工程—环境工程]