Han Xiurong, Wang Xiulin, Sun Xia, Shi Xiaoyong, Zhu Chenjian, Zhang Chuansong, Lu Rong
Ocean University of China, Qingdao 266003, China.
Ying Yong Sheng Tai Xue Bao. 2003 Jul;14(7):1097-101.
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 1st 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.
2002年4月25日至5月2日期间，对东海沿岸地区的营养物质（硝酸根氮、磷酸根磷、硅酸根硅、铵根氮等）浓度进行了测量，并分析了营养物质的空间分布与研究区域内赤潮发生之间的关系。结果表明，与国家一类海水水质标准相比，溶解无机氮（DIN）和磷酸根磷的浓度分别高出46%和60%，表明研究区域，特别是长江口和杭州湾，处于富营养化的不利状态。此外，近岸营养物质浓度远高于离岸浓度，等值线几乎与海岸线平行，这意味着营养物质分布主要受陆地排放影响。研究还表明，相对较高的营养物质浓度，特别是DIN和磷酸根磷，可能导致赤潮发生。然而，营养物质浓度最高的区域并未发生赤潮，这进一步证明富营养化并非引发赤潮的唯一环境因素。
