中街山列岛海域增养殖区表层营养盐及富营养化评价

Nutrients and Eutrophication Evaluation of Waters Mariculture Zone in Zhongjieshan Archipelago

调查2010年春、夏、秋季中街山列岛增养殖区表层海水中溶解态无机氮(DIN)、活性磷酸盐(DIP)和化学需氧量(COD)等水质指标及该海域的富营养化程度。结果表明,海水温度、盐度、pH、溶解氧、COD、无机氮(DIN)、无机磷(DIP)的月平均值均呈季节性显著差异。COD平均值较低,均低于一类海水标准;就DIN而言大多数站位为劣四类海水,而DIP表现为大多数站位属于二或三类海水。E值表明海水基本处于高富营养状态,且富营养化状态指数中COD占优势,其次为DIN,这两者起到绝对性作用;N:P值表明调查海区的海水基本处于P限制潜在性营养;有机污染指数A值表明所调查海域海水基本处于轻度有机物污染。营养盐与盐度和pH都呈显著的负相关,其中与磷酸盐的负相关最为显著,且各营养盐之间大都呈正相关。

Eutrophication of water quality indexes is studed, such as dissolved inorganic nitrogen （ DIN）, phos- phate （DIP） and chemical oxygen demand （COD） in Zhongjieshan mariculture zone in 2010. The results show that in spring, summer, autumn, the sea surface water temperature, salinity, pH, dissolved oxygen in the monthly average values were significantly seasonal differences. The average monthly values （including COD, DIN, and DIP） showed also significant seasonal difference. The mean value of COD was relatively low, which was lower than the first class seawater standard. And DIN in most stations was inferior to four categories of seawater, and the per- formance of the DIP for most stations belonging to the two or three kinds of sea water. A value of E indicated that the sea water at high eutrophication, eutrophication index and the dominance of COD, followed by DIN, both of which played a decisive, a value of N ： P indicated that the investigation of Sea water was in the P limit the potential of nutrition. Organic pollution index A value indicated that the investigation of seawater was in mild organic matter pollution. Nutrient and salinity and pH had a significant negative correlation with phosphate negative correlation, which was the most significant, and the various nutrients were were positively related to each other.