Effects of ecological restoration on speciation and release of copper in lake sediments

International Symposium on Resource Exploration and Environmental Science

地球科学;生态环境科学

Guo, Weijie^1 ; Zhao, Liangyuan^1 ; Li, Qingyun^1 ; Zhao, Weihua^1 ; Li, Huan^1

Basin Water Environmental Research Department, Yangtze River Scientific Research Institute, Wuhan

430010, China^1

关键词: Cu concentrations;    Ecological restoration;    Influence mechanism;    Natural water bodies;    Positive correlations;    Release kinetics;    Surface sediments;    Water sediments;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/64/1/012059/pdf
DOI  :  10.1088/1755-1315/64/1/012059

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The conclusion about the effect of macrophytes rhizosphere and mollusks bioturbation on morphology and mobility of heavy metals in the sediments is not entirely consistent. It is necessary to study further on influence mechanism of macrophytes growth and macrobenthos bioturbation on speciation and release of heavy metals in natural water body. This study intends to explore the influence mechanism of Bellamya aeruginosa (Bel) bioturbation and Pontederia cordata (Pon) growth on the speciation and release kinetics of Cu in sediment through construction of an aquatic organism-water-sediment system by indoor potted experiment. The results show that the particulate Cu in water of the control group and Pon treatment always maintain in lower level and the particulate Cu concentration in water of Bel treatment and Pon+Bel treatment appeared to a certain level of fluctuations at latter period. There was a significant positive correlation between the content of particulate Cu in water and the water turbidity. Bellamya aeruginosa bioturbation has not significantly affected the different speciation of heavy metals in surface sediments and the concentration of reducible Cu and Zn in the rhizosphere sediment was significantly lower than that in the control group.