2006年春季东海近海海域赤潮高发区溶解态营养盐的时空分布

测定了2006年春季东海赤潮高发海域溶解态无机营养盐的分布和含量,并初步分析它们与赤潮的关系.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54%和34%,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.另外初步分析了一次赤潮生长消亡过程中各种化学参数的变化情况.

Temporal and spatial distribution of nutrient in coastal area of East China Sea in Spring 2006

The nutrient (DIN,PO_4-P,SiO_3-Si,NH_4-N) concentrations in the coastal area of East China Sea were measured in spring,2006,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 comparing with 1st class seawater quality of the national standard,the concentrations of dissolved inorganic nitrogen (DIN) and PO_4-P were 54% and 34% higher,respectively. Specially,it was the disadvantage of eutrophication in Hangzhou Bay. Furthermore,the concentrations of nutrients in shore were much higher than those offshore,and the isolines nearly are paralleled with the coastline,meaning that nutrient distributions were mainly influenced by the terrestrial discharges. The variety of chemical factors during occurrence of the red tide is discussed.