运用AEM3D模型分析滇池蓝藻对营养盐变化的响应  

Analysis of Cyanobacterial Response to Nutrient Changes in Dianchi Lake By Using AEM3D Model

作　　者：杜成栋 潘继征[3] 张国正 李勇[1,2] 罗纯良 李清濯 华跃洲 DU Cheng-dong;PAN Ji-zheng;ZHANG Guo-zheng;LI Yong;LUO Chun-liang;LI Qing-zhuo;HUA Yue-zhou(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215011,China;Jiangsu Key Laboratory of Environmental Science and Engineering,Suzhou 215011,China;State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography&Limnology,Chinese Academy of Sciences,Nanjing 210008,China;Jiangsu Weixin Engineering Consulting Co.Ltd.,Nanjing 210008,China;Kunming Dianchi Plateau Lake Research Institute,Kunming 650000,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]苏州科技大学环境科学与工程学院,江苏苏州215011 [2]江苏省环境科学与工程重点实验室,江苏苏州215011 [3]中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室,江苏南京210008 [4]江苏纬信工程咨询有限公司,江苏南京210008 [5]昆明市滇池高原湖泊研究院,云南昆明650000 [6]中国科学院大学,北京100049

出　　处：《生态与农村环境学报》2023年第12期1534-1546,共13页Journal of Ecology and Rural Environment

基　　金：国家自然科学基金(41001324);国家水体污染控制与治理科技重大专项(2017ZX07204005)。

摘　　要：为了解滇池蓝藻暴发的时空分布规律以及外源营养盐调控对蓝藻暴发的影响,采用澳大利亚HydroNumerics公司的三维水动力水质模型AEM3D(3-Dimensional Coupled Hydrodynamic-Aquatic Ecosystem Model)对总氮(TN)、总磷(TP)和蓝藻时空分布特征进行模拟研究,并通过调控外源营养盐的数值,探究蓝藻在不同外源营养盐浓度下的响应关系。结果表明,春季总磷浓度较高,在藻类生长中充当重要的营养盐因子;秋季总氮浓度较高,对藻类生长起到了关键作用;在模拟单因子外源营养盐不同削减比例时发现,外源总磷对蓝藻的响应大于外源总氮,其中春季外源氮的变化对蓝藻的影响较大;在仅控制总磷时,削减25%能有效减少湖内叶绿素a(Chl-a)浓度,在仅控制总氮时,50%的氮削减较为合理;氮磷营养盐同时削减10%或50%以上时对Chl-a浓度的影响效果显著优于单一营养盐的削减。In order to understand the spatial and temporal distribution patterns of cyanobacterial outbreaks and the effect of exogenous nutrient regulation on cyanobacterial outbreaks in Dianchi Lake,the 3-Dimensional coupled Hydrodynamic-Aquatic Ecosystem Model(AEM3D)from HydroNumerics,Australia was used to simulate the spatial and temporal distribution characteristics of TN,TP and cyanobacteria,and to investigate the response relationship of cyanobacteria under different exogenous nutrient concentrations by regulating the values of exogenous nutrients.The results show that the concentration of TP was higher in spring,which acted as an important nutrient factor in algal growth.The concentration of TN was higher in autumn,which played a key role in algal growth.When simulating single-factor exogenous nutrient reduction at different rates,it was found that total exogenous phosphorus had a greater effect on cyanobacteria than total exogenous nitrogen,while the changes in exogenous nitrogen in spring had a greater effect on cyanobacteria.When only TP was controlled,a 25%reduction was effective in reducing Chl-a concentration in the lake,and when only TN was controlled,a 50%nitrogen reduction was more reasonable.Compared to the reduction of a single nutrient,the effect on control of Chl-a concentration was superior when nitrogen and phosphorus nutrients were both reduced by 10%or above 50%at the same time.

关 键 词：滇池 蓝藻 AEM3D 外源营养盐 

分 类 号：X82[环境科学与工程—环境工程]