高温热浪情景下城市水体典型蓝藻种群竞争生长和代谢机制

Global climate change and urbanization due to eutrophication in urban water bodies, frequent outbreaks of cyanobacteria and odor metabolites. Taking three typical algae (Microcystis sp., Anabaena sp. and Oscillatoria sp.) as objects based on the investigation of water quality and cyanobacteria population structure, this study will establish the actual water quality simulation systems. It is primary research contents that algae species competitive growth and taste and odor metabolic rules under different condition of factors of temperature, CO2 level, concentration of nitrogen and phosphorus under the heat wave scenarios in 3-5 Beijing urban water bodies, which has different types of water resource, such as lakes, river, reused water. Through multi factors independent and orthogonal micro simulation experiments, the rules of growth and characteristics of population competition odor metabolites (β-cyclocitral, MIB, Geosmin) of will be studied. Then cyanobacteria outbreak model will establish at heat wave scenarios to investigate typical cyanobacterial population growth and metabolic mechanism in urban water bodies under the heat wave scenarios. It put forward new ideas and new methods of climate change on cyanobacterial population growth in urban water bodies, and provide a scientific basis for the control and management of cyanobacterial growth in urban.

全球气候变化和城市化引起城市水体出现不同程度的富营养化，蓝藻频繁暴发，带来有毒及异味代谢产物等问题。本研究选择3-5处不同类型水源（湖泊、河流、再生水）的北京城市水体，在对北京城市水体水质条件及蓝藻种群结构进行针对性调查的基础上，以三种典型蓝藻（微囊藻、鱼腥藻和颤藻）为对象，以高温热浪情景下对城市水体产生重要影响的温度、CO2浓度两种主要环境因子为控制条件，结合目前水体的高营养盐水平，建立实际水体水质模拟系统，分别进行多因子的独立和正交模拟实验，研究典型蓝藻的种群竞争生长及特征嗅味代谢物质（环柠檬醛、MIB、geosmin）产生规律，建立高温热浪情景下典型蓝藻的竞争生长及暴发模型，探讨高温热浪情景下城市水体典型蓝藻种群竞争生长和代谢机制，提出气候变化对城市水体蓝藻演替影响的新思路和新方法，为城市水体蓝藻控制和管理提供科学的理论依据。

本研究针对近年来持续多次出现的全球气候变化的高温热浪情景开展了系列研究，首先于2015年完成了33处不同类型水源（湖泊、河流、再生水）的北京城市水体泊藻类及代谢物五个月的调查，2016年筛选出7个湖泊开展深入调查。其次，本研究在实际水体典型蓝藻的调查基础上以五种典型蓝藻（微囊藻、螺旋鱼腥藻、束丝藻、两种浮颤藻）为对象，以高温热浪情景下对城市水体产生重要影响的温度、无机碳浓度、pH等环境因子为控制条件，结合目前实际水体的高营养盐水平，建立了实际水体水质模拟系统，分别进行多因子的独立和正交模拟实验，研究了典型蓝藻的种群竞争生长及特征嗅味代谢物质（β-环柠檬醛、MIB、geosmin）产生规律，探讨了高温热浪情景下城市水体典型蓝藻种群竞争生长和代谢机制，最后开展了针对性的对嗅味物质和典型蓝藻的氧化效果研究，为水体蓝藻控制和管理提供科学的理论依据。