北黄海西部海区营养盐季节变化及其影响因素探讨

The Seasonal Changes of Nutrients and Interfering Factors in the West of the North Yellow Sea

根据2006-07-2007-10对北黄海4个航次调查资料,分析并讨论了北黄海西部海区营养盐四季变化及其影响因素。DIN,PO4-P和SiO3-Si的浓度从春季到冬季逐渐升高。春、夏、秋季营养盐底层浓度均远远大于表层的,冬季营养盐各层浓度相近。黄海冷水团是影响北黄海西部营养盐季节变化的主要因素,黄海暖流和鸭绿江水的输入对北黄海西部营养盐季节变化影响不显著;受北黄海跃层的影响,北黄海西部海区营养盐浓度除冬季外,垂直方向均呈现出分层现象,表层浮游植物吸收营养盐,使表层营养盐浓度低于底层的。

Based on the data of four cruises carried out from July 2006 to October 2007,the seasonal changes of nutrients and interfering factors in the west of the North Yellow Sea were analyzed.The results showed that the concentrations of DIN,PO4-P and SiO3-Si increased gradually from spring to winter.The concentrations of nutrients at bottom were far higher than those at surface in spring,summer and autumn,however,the concentrations at all layers were similar in winter.The seasonal changes of nutrients in the west of the North Yellow Sea were dominantly affected by the cold water mass,and not significantly influenced by both Yellow Sea warm current and Yalu River..The concentrations of nutrients were vertically stratified due to thermo cline of the North Yellow Sea.Since the nutrients assimilated by the phytoplankton at the surface in all seasons except in winter,the concentrations of nutrients at the surface were far less than those at the bottom.