岱山赤潮监控区氮磷营养盐变化特征及其潜在性富营养化程度评价①.PDF

20 11 N O .27 科技资讯 SCIENCE TECHNOLOGY INFORMATION 工 业 技 术 岱山赤潮监控区氮磷营养盐变化特征及其潜在性富营养 化程度评价① 叶然 ( 国家海洋局宁波海洋环境监测中心站 浙江宁波 3 1 5 0 4 0 ) 摘 要:根据2007年至2009年4 ～10月岱山赤潮监控区水质监测资料,对N 、P营养盐的污染现状、变化规律、结构特征进行分析,并进行 潜在性富营养化程度评价。结果表明,监控区水体处于严重的富营养化状态,无机氮(DIN)是富营养化的主要驱动因子;受海洋浮游植物生长 繁殖规律以及陆源污染物排放的影响,监控区营养盐含量呈明显的时间变化特征:即春季高,夏季低(8月最低),至9月有所回升;在8个监测 站位中,S 站点营养盐含量最高,S 站点最低。赤潮监控区DIN处于热力学平衡状态,NO -N 占DIN 的94.79%,是岱山赤潮监控区无机氮的主 1 8 3 要存在形式。潜在性富营养化评价结果显示:监控区的营养水平等级介于中度营养与富营养之间( Ⅱ～Ⅲ),并逐渐趋于富营养等级(Ⅲ) 。 关键词: 岱山赤潮监控区 营养盐 变化特征 潜在性富营养化 中图分类号:X 82 文献标识码:A 文章编号: 16 72 -3 7 9 1(2 0 1 1) 0 9 (c) -00 9 9 -0 3 Ab stract :The statu s of nutrients pollution and variation and it s structural charicteristic in red tide monitoring area of Daishan were analyzed as well as potential eutrophication assessment based on the monitoring data of nutrient from April to October,2007～2009. The result s indicate that the water qu ality is on the state of severe eutrophication ,which turns out that inorganic-nitrogen (DIN) is the main driving factor of eutrophication .Due to the effection of the reproduction of marine phytoplankton as well as land-sourced p ollutants,the content of nutrient s disp lays with a significant time variation ,which is high in spring and low in summer(lowest on Augu st) and rise again on Septemb er ..The content of Station 1 is the highest among 8 stations while S8 is the lowest,and N O -