廉州湾五项营养盐变化与环境因子的关系

The Relation of Change of Five Nutrients and Environmental Factors in Lianzhou Bay

关键词:  营养盐  分布特征  环境因子

Key words:  nutrients  distribution  environmental factors

摘要:

根据1996年12月及1997年7月调查廉州湾的资料,分析廉州湾水域五项营养盐:NO₃-N、NO₂-N、NH₄-N、PO₄-P、SiO₃-Si的含量分布特征,并对五项营养盐与其它环境因子之间进行相关分析。结果表明:廉州湾水域NO₃-N、NO₂-N、PO₄-P和SiO₃-Si均具有丰水期明显高于枯水期的分布特征,NH₄-N则与此相反。影响枯水期营养盐含量的主要因素是以江河径流影响为主、沿岸排污和水体自身再生补充影响为辅;但在丰水期,只有NO₃^-、NO₂^-与盐度之间呈良好负相关关系(相关系数分别为r=-0.805和r=-0.766,n=7),其它三项营养盐与盐度及其它环境因子均呈不相关关系,体现出暴雨后径流与沿岸排污综合影响的结果

Abstract:

The distribution of contents of five nutrients is analyzed based on the investigation of December 1996 and July 1997 in Lianzhou Bay of Guangxi.The correlation analysis of the five nutrients (including NO₃-N、NO₂-N、NH₄-N、PO₄-P、SiO₃-Si) and environmental factors is conducted.The contents of NO₃ -N、NO₂ -N、PO₄ -P and SiO₃ -Si in high water discharge period are higher than that in low water discharge period,and reverses for NH₄ -N.The river runoff is the key factor affecting the contents of nutrients in low water discharge period.The sewage from shore and water self-recycle also have some influence.In high water discharge period,there is good negative correlativity of NO₃^-、NO₂^- to salinity (r=-0.805,r=-0.766, respectively, n=7), and no correlativity of PO₄^- and SiO₃^- to salinity.The results reveal the joint influence of runoff after heavy raining and sweage drainage from shore land.