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引用本文:徐进,徐力刚,张奇.磷素在湖滨湿地基质-上覆水界面中的迁移过程.湖泊科学,2009,21(5):675-681. DOI:10.18307/2009.0510
XU Jin,XU Ligang,ZHANG Qi.Removal and transfer process of phosphorus between substrate and overlying water in riparian wetlands. J. Lake Sci.2009,21(5):675-681. DOI:10.18307/2009.0510
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磷素在湖滨湿地基质-上覆水界面中的迁移过程
徐进1,2, 徐力刚2, 张奇2
1.南京工程学院环境工程系, 南京 211167;2.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, 南京 210008
摘要:
以抚仙湖流域马料河湖滨湿地基质为研究对象,进行了低浓度(P≤3.0mg/L)负荷条件的吸附动力学试验;以及低、高浓度磷的吸附等温线试验.结果表明,在初始磷浓度为0.02mg/L、0.03mg/L时,基质存在磷释放现象.当初始浓度增加到0.05mg/L时,基质开始吸附磷,24h后吸附趋于平衡状态.以一元线性回归法对上述基质的吸附等温线进行了Freundlich模型和Langmuir模型的回归分析,在此基础上,进行了高初始浓度下上覆水与基质振荡24h后基质对磷的吸附试验,结果表明在高浓度下,基质样品可在24h内释放原来吸附的大部分磷量.
关键词:  湿地  基质  上覆水    吸附  抚仙湖
DOI:10.18307/2009.0510
分类号:
基金项目:国家自然科学基金项目(40701176,40871026);湖泊与环境国家重点实验室开放基金项目;南京工程学院引进人才科研启动基金项目(KXJ08020)
Removal and transfer process of phosphorus between substrate and overlying water in riparian wetlands
XU Jin1,2, XU Ligang2, ZHANG Qi2
1.Department of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, P.R.China;2.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China
Abstract:
The substrate of the riparian wetland of Maliao River, Lake Fuxian catchment, was selected to investigate the removal andtransfer process of phosphorus. The experiments of adsorption dynamics was examined under the low concentration scenario(P≤3.0mg/L), and the experiment of adsorption isotherms also was examined under high and low concentration scenario. The results ofdynamic adsorption showed that phosphorus release existed in the substrate when the initial concentrations of phosphorus were 0.02and 0.03mg/L. The phosphorus had been adsorbed by substrate when the initial concentration had been increased to 0.5mg/L. Finallythe adsorption curves tended to be stable after 24 hours. Regression analysis based on Freundlich model and Langmuir model on theadsorption isotherms of substrates was carried on by monadic linear regression method. Based on Freundlich model analysis, theadsorption experiment of phosphorus on substrate was examined between overlying water and substrate under the high initialconcentration as well as 24 hours oscillation. The results showed that most of the phosphorus adsorbed originally in the substrate wasreleased within 24 hours under high concentration condition.
Key words:  Wetland  substrate  overlying water  phosphorus  adsorption  Lake Fuxian
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