白洋淀草型与藻型水域溶解氧含量的差异性

Differences of Contents of Dissolved Oxygen Between Oligotrophic Water Area and Algal Water Area in Baiyangdian Lake

为了揭示白洋淀草型与藻型水域溶解氧变化规律,通过连续调查,并用多元统计分析建立了不同水域溶解氧与环境因子相互关系。研究结果表明,草型水域与藻型水域的溶解氧平均含量变化规律相似,均在平水期上升、丰水期下降;在一定范围内,草型水域中溶解氧含量与叶绿素a含量及沉水植物呈现出二次多项式关系;藻型水域中溶解氧含量与叶绿素a含量为二次多项式关系,与浮游植物生物量为指数关系;草型水域中溶解氧含量与氨氮含量呈正相关,与硝态氮含量呈负相关,藻型水域中溶解氧含量与氨氮含量呈正相关,与硝态氮、总氮、总磷和总有机碳含量呈负相关。

Surveys in this study revealed the dissolved oxygen variations of oligotrophic water area and algal water area in Baiyangdian Lake. Multivariate statistical analysis was utilized to establish the relationship between dissolved oxygen and environmental factors in the different regions. Experimental results showed that the dissolved oxygen content rise firstly on level period and drop afterwards during high flow period, which exhibited the similar trend in oligotrophic water area and algal water area. Within a certain range, the dissolved oxygen in oligotrophic water area showed quadratic polynomial relationship with chlorophyll-a and submerged plants; the dissolved oxygen in algal water area exhibited quadratic polynomial relationship and exponential relationship with chlorophyll-a and phytoplankton biomass, respectively. Dissolved oxygen in oligotrophic water area was positively correlated with ammonia, but negatively correlated with nitrate. Dissolved oxygen in algal water area was positively correlated with ammonia, but negatively correlated with nitrate, total nitrogen, total phosphorus, and total organic carbon. This study could provide a theoretical support for maintaining the lake steady-state through the dissolved oxygen analysis of different regions.