五垒岛湾海域无机氮、无机磷的时空分布和氮磷比值变化

Variation of Distribution of Dissolved Inorganic Nitrogen and Dissolved Inorganic Phosphorus in the Seawater in Wuleidao Bay

根据2012-2014年5月、10月的调查数据,分析了五垒岛湾海水中无机氮、无机磷的时空分布特征和N/P比值的变化。结果表明,该海域水体中无机氮、无机磷平均含量分别为0.202mg/L和0.011mg/L,达国家二类水质标准,均表现出逐年增加的趋势;空间分布上表现出近岸水域含量大于远岸的变化趋势,原因可能是受陆源物质输入的影响所致;除少数站位外,该海域N/P比值接近16∶1,并表现出逐年增大的趋势,但春季可能受到赤潮的威胁。

Based on the survey data in May and October from 2012 to 2014in the waters of Wuleidao Bay,the variation of distribution of dissolved inorganic nitrogen and dissolved inorganic phosphorus in the seawater in Wuleidao Bay were analyzed.The result showed that the mean content of DIN and DIP was 0.202mg/L and 0.011mg/L respectively,and they were increasing year by year.The DIN and DIP contents of all sampling sites were accord with seawater quality II.The spatial distribution showed the contents in the coastal waters were higher than in the offshore waters due to the impact of the continental discharges.The atomic N/P ratios were equal to 16 and increasing year by year.The red tide may constitute a serious threat to the sea area in spring.