气象与水质对滇池草海叶绿素a浓度的影响

Influences of Meteorological Conditions and Water Quality Factors on Chlorophyll-a in Caohai,Dianchi Lake

为研究滇池的叶绿素a含量与气象条件、水质因子的关系,利用滇池地区气候资料检测数据和滇池草海水质理化指标监测数据,运用多层线性模型来分析叶绿素a与总磷、总氮、透明度、生化需氧量、溶解氧等水质因子及光照、温度、风速、降水等气象条件的关系。模型分析结果表明:(1)水质因子中总磷与滇池草海叶绿素a含量正相关,而总氮、透明度分别与叶绿素a负相关;(2)气象条件中总辐射、降水量对滇池草海叶绿素a含量影响显著。滇池草海中总氮已经超过常规研究中对叶绿素a限制的上限,已经完全不再限制叶绿素a的生长。因此滇池草海水体可能是磷限制性湖泊。因此现阶段滇池富营养化的控制以控制总磷水平为主,同时提高水体透明度,短期控制中可以考虑采用人工降雨等气象控制予以辅助。

Based on the monitoring data of Dianchi Lake, a statistic analysis was conducted to reveal the relationship among chlorophyll-a, the water quality factors and the meteorological conditions by multilevel linear model. The model shows that the water quality factors, including total phosphorus（TP）, total nitrogen（TN） and disc depth（SD）, as well as the meteorological conditions of total radiation and precipitation, have significant effect on Chlorophyll- a.TN in Caohai, Dianchi Lake has exceeded the need of Chlorophyll-a, thus completely no longer limits the reproduce of Chlorophyll-a. Therefore, TP might be a more important control factor for chlorophyll-a. Weather conditions such as total radiation and precipitation also have significant influence. Key water chemistry control will help to reduce the concentration of Chlorophyll- a in Caohai,Dianchi Lake, while for short-term purpose, weather control might also contribute.