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引用本文:向速林,陶术平,吴代赦.鄱阳湖沉积物和水界面磷的交换通量.湖泊科学,2017,29(2):326-333. DOI:10.18307/2017.0208
XIANG Sulin,TAO Shuping,WU Daishe.Exchange fluxes of phosphorus at the sediment-water interface in Lake Poyang. J. Lake Sci.2017,29(2):326-333. DOI:10.18307/2017.0208
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鄱阳湖沉积物和水界面磷的交换通量
向速林1,2, 陶术平1, 吴代赦2
1.华东交通大学环境工程系, 南昌 330013;2.南昌大学教育部鄱阳湖湖泊生态与生物资源利用重点实验室, 南昌 330047
摘要:
采用扩散模型法与实验培养法对鄱阳湖沉积物和水界面间可溶性总磷和可溶性磷酸盐的界面交换过程进行研究,并探讨了其影响因素.结果表明,利用2种方法得到鄱阳湖各站点可溶性总磷和可溶性磷酸盐在沉积物与水界面间的交换方向不完全相同,大部分站点沉积物是磷的源,其中,利用扩散模型法估算的可溶性总磷和可溶性磷酸盐平均扩散通量分别为0.052和0.047 mg/(m2·d),而实验培养法测得可溶性总磷和可溶性磷酸盐的平均交换通量则分别为0.25和0.24 mg/(m2·d),且各站点利用扩散模型法测得磷的交换通量均小于实验培养法的计算结果.此外,上覆水溶解氧浓度及水体温度对可溶性总磷和可溶性磷酸盐的交换过程均具有一定的影响,表现为温度越高,溶解氧浓度越小,可溶性总磷和可溶性磷酸盐的交换越强烈.
关键词:  鄱阳湖    沉积物和水界面  交换通量
DOI:10.18307/2017.0208
分类号:
基金项目:江西省教育厅科技项目(GJJ150540)和江西省自然科学基金项目(20114BAB213020)联合资助.
Exchange fluxes of phosphorus at the sediment-water interface in Lake Poyang
XIANG Sulin1,2, TAO Shuping1, WU Daishe2
1.Department of Environment Engineering, East China Jiaotong University, Nanchang 330013, P. R. China;2.Key Laboratory of Lake Poyang Ecology and Bioresource Utilization of MOE, Nanchang University, Nanchang 330047, P. R. China
Abstract:
Through diffusive model methods and laboratory incubation experiments, exchanging fluxes of dissolved total phosphorus(DTP) and dissolved phosphate(DIP) at the sediment-water interface of the Lake Poyang were measured, and their influencing factors were identified. The results show that the exchanging direction of DTP and DIP were unascertainable by applying the two methods, and the sediment is a source of phosphorus in most locations. The average diffusive fluxes of DTP and DIP at the sediment-water interface using diffusive model methods were 0.052 and 0.047 mg/(m2·d), respectively. The exchanging fluxes through the laboratory incubation experiments were higher than that using the diffusive model methods for all sites, and the average exchanging fluxes of DTP and DIP at the sediment-water interface were 0.25 and 0.24 mg/(m2·d), respectively. In addition, the fluxes of DTP and DIP had superior differences under different contents of dissolved oxygen and different temperatures. The exchange of DTP and DIP increased with the increasing temperature and decreasing dissolved oxygen. The results are useful for the eutrophication control and ecological restoration in the Lake Poyang.
Key words:  Lake Poyang  phosphorus  sediment-water interface  exchanging flux
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