广西南流江口海域盐度的锋面特征及其与环境因子的关系

Frontal characteristic of the salinity and its relations to environmental factors in Nanliujiang Estuary,Guangxi

本文通过1998年10月和1999年1月、4月、8月4个季度月的调查资料,对南流江口海域盐度锋面特征的形成及其与环境因子的关系进行了分析研究.结果表明:该海域盐度的锋面特征随季节变化较大,春季突出了南流江径流的影响作用,夏、秋季则突出了北上海流和西向沿岸流的顶托影响作用,冬季则由合浦沿岸水及南流江径流综合影响所形成;相关分析显示,盐度与环境因子之间的关系,除径流影响较小的冬季外,多具有密切关系,而且除pH外,均表现为负相关.其中以与溶解态N、P、Si的相关性最好,都达到了高度显著水平,与COD、SS的关系次之,其余形态氮多以良好负相关出现,而形态磷的相关性都表现较差.显然,南流江径流对北海湾溶解性N、P、Si贡献最大,这是导致该湾N明显偏高、P成为赤潮诱发因子、Si成为最丰富营养盐的主要原因.

According to the data obtained in Oct. of 1998 and Jan. , Apr. and Aug. of 1999, the formation of the Nanliujiang Estuary area＇s frontal characteristic of the salinity and its relationship with the environmental factors were aralysed. The results showed that the frontal characters changed a lot in different seasons. The effect of the runoff of Nanliujiang in spring is prominent. But in summer and autumn the effect is mostly due to the withstanding of the northward sea current and the westward coastal current. In winter it＇s the integrative effect by the coastal current in Hepu and the runoff of Nanliujiang. The analysis showed that the salinity and the environment factors were closely related except in winter when the runoff affected less. The correlations appeared to be all negative but for pH. Among them dissolved N,P,Si were the most correlated and COD and SS took the second . The rest form of nitrogen appeared to be negatively correlated, except for the form of phosphorus . Obviously, the runoff from Nanliujiang River contributed to the most reasons of nutrients which led to higher N and P for red tide and Si abundant in the estuary.