流速对水库水华优势种铜绿微囊藻生长的影响研究

发布时间：2018-04-03 20:08

本文选题：水动力　切入点：水华　出处：《四川大学学报(工程科学版)》2016年S1期

【摘要】：为了探究流速对于水库水华优势藻生长的影响规律与作用机理,以铜绿微囊藻为例,通过室内实验开展静水和0.05~0.30 m/s流速下的藻类生长状况、水质状况及藻类脂质氧化及抗氧化体系响应的同步检测分析,发现不同流速水平下藻的生长存在显著差异,并呈现低促高抑现象,其中0.1 m/s组藻密度比增长率最大、营养盐消耗率最大、长势最优,而0.3 m/s组长势显著差于静水组;各组水体酸碱度均随时间趋弱碱性,溶解氧缓升,浊度则与藻密度水平保持高相关性;0.3 m/s组的藻体丙二醛含量及超氧化物歧化酶、过氧化物酶、过氧化氢酶活性均显著高于其余各组。结果表明,在一定流速范围内,动水环境更利于藻类改善其漂浮聚集状态,促进光能吸收,加强对营养物质的吸收,降低氧化损伤。实验周期内确定了铜绿微囊藻在动水环境下的生长预测经验公式以及优势流速0.15 m/s,为水库富营养化趋势预测以及铜绿微囊藻水华防控奠定基础。
[Abstract]:In order to investigate the effect of flow rate on the growth of dominant algae of Shui Hua reservoir and its mechanism, the growth of microcystis aeruginosa was carried out in the laboratory under static water and 0.05 ~ 0.30 m / s velocity, taking microcystis aeruginosa as an example.The water quality and the response of algae lipid oxidation and antioxidant system were analyzed simultaneously. It was found that there were significant differences in algae growth at different flow rates, and the growth rate of algae was the highest in 0.1 m / s group, and the growth rate of algae was the highest in 0.1 m / s group.The nutrient consumption rate was the largest and the growth was the best, while the 0.3 m / s group potential was significantly worse than that of the static water group, and the pH and alkalinity of the water in each group tended to be weak and alkaline with time, and the dissolved oxygen increased slowly.The activity of superoxide dismutase (SOD), peroxidase and catalase were significantly higher in the group of turbidity and algae density (0.3 m / s) than in the other groups.The results showed that the hydrodynamic environment was more favorable for algae to improve its floating and aggregation state, to promote the absorption of light energy, to enhance the absorption of nutrients and to reduce the oxidative damage.The empirical formula of microcystis aeruginosa growth prediction and the dominant velocity of 0.15 m / s were determined in the experimental period, which laid a foundation for the prediction of eutrophication trend of reservoir and the prevention and control of microcystis aeruginosa Shui Hua.
【作者单位】：四川大学水力学与山区河流开发保护国家重点实验室;爱立信信息通信技术服务有限公司大连分公司;
【基金】：国家自然科学基金资助项目(51309170)
【分类号】：X524

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