杭州湾表层海水营养盐分布特征及富营养化状况研究

根据2015年3月和8月杭州湾的海水质量监测数据,分析了该海域的营养盐分布特征以及富营养化状况,结果表明:杭州湾表层海水无机氮变化范围为0.36~4.22 mg/L,活性磷酸盐的含量范围为0.014~1.51 mg/L,化学需氧量含量范围为0.56~3.18 mg/L.该海域无机氮和活性磷酸盐超标严重,表层海水已处于重度富营养化状态,调查站位EI均大于1.该海域表层海水无机氮、活性磷酸盐、化学需氧量和富营养化指数高值区均与陆源入海口、养殖区、排污口等人类活动影响较大的区域有关.

Nutrient Distribution and Eutrophication Status of Surface Seawater in Hangzhou Bay

Based on the seawater quality monitoring data collected in Match and August 2015 in Hangzhou Bay, the character of nutrients distribution and the status of eutrophication were analyzed. The result shows that, the DIN concentration of surface wa-ter ranged from 0. 36 to 4. 22 mg/L, the concentration of PO4 -P ranged from 0. 014 to 1. 51 mg/L, and the concentration of COD ranged from 0. 56 to 3. 18 mg/L. The DIN and PO4 -P exceeded seriously the seawater quality standard, the surface sea area is at status of serious eutrophication with the eutrophication indices(E)in all stations larger than 1. The high value area of DIN, PO4-P, COD and E are all related to the area of human activities, like estuary, cultivation area and sewage outfall.