| 摘要: |
| 在实验室控制条件下,研究了玄武湖底泥在饱和溶解氧、75%、50%、25%、0%溶解氧水平下底泥-水界面磷交换,探讨了溶解氧对底泥-水界面磷交换的影响途径.结果表明:(1)上覆水溶解氧与玄武湖底泥溶解性磷酸盐、溶解性总磷释放速率呈开口向上的抛物线关系;(2)上覆水溶解氧水平可以决定磷在底泥-水界面交换中的转换方向,而且还影响间隙水中溶解氧扩散深度,25%、50%、75%和饱和溶解氧水平下溶解氧最大扩散深度分别为0.974cm、1.377cm、1.687cm和1.948cm,溶解氧在间隙水中最大扩散深度影响底泥-水界面的磷交换;(3)溶解氧可通过影响底泥-水界面处电位、藻类聚磷作用以及pH来影响底泥-水界面的磷交换. |
| 关键词: 溶解氧 底泥 磷交换 玄武湖 |
| DOI：10.18307/2010.0317 |
| 分类号: |
| 基金项目:国家自然科学基金项目(40730528);国家水体污染控制与治理科技重大专项项目(2008ZX07103-003)联合资助 |
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| Effect factors analysis of phosphorus exchange across lake sediment-water interface un-der different dissolved oxygen concentration |
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GONG Chunsheng1,2, FAN Chengxin3
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1.Guangdong Provincial Academy of Environmental Science, Guangzhou 510045, P. R. China;2.Research Center for Environmental Engineering and Management, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, P. R. China;3.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
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| Abstract: |
| The exchange of phosphorus across sediment-water interface of Lake Xuanwu under static state was studied in laboratory,and effect factors of phosphorus exchange across sediment-water interface were carried out under 100%,75%,50%,25% and 0% saturation dissolved oxygen concentration. The results showed that the relationship between dissolved total phosphorus and dissolved phosphorus release rate from sediment with dissolved oxygen concentration in overlay water was parabola. The direction of phos-phorus exchange across sediment-water interface was decided by the dissolved oxygen. The maximum pervasion depth in pore water under different dissolved oxygen concentration influenced the phosphorus exchange amounts across sediment-water interface. Dis-solved oxygen affect directly the electric potentials and algae absorbing phosphorus and pH value, then influenced the phosphorus exchange across sediment-water interface. |
| Key words: Dissolved oxygen sediment phosphorus exchange Lake Xuanwu |
