东海近海海域营养盐分布特征及其与赤潮发生关系的初步研究

摘要/Abstract

摘要： 根据2002年4月25日～5月2日的调查数据,分析了东海近海海域营养盐(NO₃^--N,PO₄^3--P,SiO₃^2--Si,NH4N等)的分布特征,并初步探讨了营养盐分布与赤潮发生的关系.结果表明,调查海区营养盐浓度较高,与国家一类海水水质相比,无机氮和无机磷的超标率分别为46%和60%,长江口及杭州湾附近海域富营养化程度比较严重.调查海域由于受沿岸长江等河流输入的影响,营养盐浓度自近岸向外海快速递减,等值线几乎与海岸线平行.根据调查结束后赤潮发生的特点和区域,表明营养盐浓度的增加,尤其是DIN和PO₄^3--P的增加,与赤潮的发生有一定关系,但本次赤潮并不是发生在营养盐浓度最高的海区,因此,富营养化并不是诱发本次赤潮发生的唯一环境因素.

Abstract: Nutrient (NO₃^--N, PO₄^3--P, SiO₃^2--Si, NH₄⁺-N,etc.) concentrations in coastal area of East China Sea were measured during April 25 to May 2, 2002,and the relationship between the spatial distribution of the nutrients and the red tide occurrence in the studied area was analyzed. The results showed that compared to the 1^st class seawater quality of the national standard, the concentrations of dissolved inorganic nitrogen (DIN) and PO₄^--P were 46% and 60% higher, respectively, showing that the studied area, especially the Changjiang River estuary and the Hangzhou Bay, was at a disadvantage of eutrophication. Furthermore, the nutrient concentrations inshore were much higher than those offshore,and the isolines nearly paralleled with the coastline, meaning that the nutrient distributions were mainly influenced by terrestrial discharges. It also showed that the relatively high concentrations of nutrients, especially DIN and PO₄^3--P, might result in the red-tide occurrence. However, the red tide did not occur in the area with the highest concentrations of the nutrients, further demonstrating that the eutrophication was not the unique environmental factor inducing red-tide occurrence.

中图分类号:

P734.2

韩秀荣, 王修林, 孙霞, 石晓勇, 祝陈坚, 张传松, 陆茸. 东海近海海域营养盐分布特征及其与赤潮发生关系的初步研究[J]. 应用生态学报, 2003, (7): 1097-1101.

HAN Xiurong, WANG Xiulin, SUN Xia, SHI Xiaoyong, ZHU Chenjian, ZHANG Chuansong, LU Rong . Nutrient distribution and its relationship with occurrence of red tide in coastal area of East China Sea[J]. Chinese Journal of Applied Ecology, 2003, (7): 1097-1101.

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