廉州湾赤潮形成期间pH值和溶解氧的时空分布及其与环境因素的关系

The Temporal and Spatial Distribution of pH Value and DO and Their Relation with the Environmental Factors during the Formation of the Algal Bloom in Lianzhou Bay

根据 1995年 3月 15日和 16日对廉州湾首次发生微囊藻赤潮的同步调查资料 ,分析廉州湾赤潮形成期间 p H值、溶解氧的分布变化及其与环境因子和营养盐之间的关系。结果表明 ,p H值具有赤潮前明显低于赤潮时的分布特征 ,溶解氧则与此相反。赤潮前以 p H值与氧饱和度 (O2 % )的正相关较为显著 (r=0 .86 3) ,溶解氧 (DO)与化学耗氧量 (COD)和叶绿素 a(Chl- a)的正相关较为显著 (r=0 .834,0 .830 ) ;赤潮时以 p H值与盐度 (S)和悬浮物 (SS)的正相关较为显著 (r =0 .84 3,0 .80 3) ,DO与 O2 %的正相关较为显著 (r =0 .995 )。赤潮前 ,p H值与三态无机氮之间均具有明显的负相关趋势 ,其中以与 NH+ 4的相关性较为显著 (r =- 0 .84 2 ) ,DO则具明显的正相关趋势 ,但相关性均不显著 ;赤潮时 ,p H值、 DO与氮、磷营养盐之间均具有明显的负相关趋势 ,p H值与 NO- 3和 NO- 2 的相关性最为显著 (r=- 0 .972 ,- 0 .96 7) ,DO与 PO- 4和 NH+ 4的相关性较为显著 (r =- 0 .85 3,- 0 .92 9)。

This paper dealt with the synchronous investigation on the bloom of Microcystis Kuetz firstly happened in Lianzhou bay on 15th and 16th of March,1995.The temporal and spatial distribution of pH and DO and their relation with the environmental factors and the nutrient salt during the formation of algal bloom were studied.The results showed that the pH value monitored before the occurring of algal bloom was much lower than that in the midst of algal bloom,and DO contents appeared an adverse rule.As to the correlation with the environmental factors,before the occurring of algal bloom,there was positive correlation between pH value and O 2%,DO and COD,and DO and Chl-a,the correlation coefficients r were 0.863,0.834 and 0.830 respectively.And in the midst of algal bloom,there was positive correlation between pH and S,pH value and SS,DO and O 2%,the correlation coefficients r were 0.843,0.803 and 0.995 respectively.As to the correlation with nutrient salt,before the occurring of algal bloom,there was obvious negative correlation trend between pH value and the three states of inorganic nitrogen,particularly between pH value and NH+ 4,and correlation coefficients r was -0.842.And an obvious positive correlation trend between DO and the three states of inorganic nitrogen could be observed,but it did not reach the level of significance.In the mist of algal bloom,there was negative correlation trend between pH,DO and nitrogen phosphorus nutrient salt.And the correlation coefficients r between pH value and NO- 3,pH and NO- 2,DO and PO- 4,Do and NH+ 4 were -0.972,-0.967,-0.853 and -0.929 respectively.