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引用本文:龚春生,姚琪,范成新,董浩平,郑超海,包先明.城市浅水型湖泊底泥释磷的通量估算—以南京玄武湖为例.湖泊科学,2006,18(2):179-183. DOI:10.18307/2006.0212
GONG Chunsheng,YAO Qi,FANG Chenxin,DONG Haoping,ZHENG Chaohai,BAO Xianming.Release fluxes estimate of phosphorus in a urban shallow lake:Lake Xuanwu, Nanjing. J. Lake Sci.2006,18(2):179-183. DOI:10.18307/2006.0212
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城市浅水型湖泊底泥释磷的通量估算—以南京玄武湖为例
龚春生1, 姚琪1, 范成新2, 董浩平1, 郑超海1, 包先明2
1.河海大学环境科学与环境工程学院 南京 210098;2.中国科学院南京地理与湖泊研究所 南京 210098
摘要:
以南京玄武湖为研究对象,通过静态条件下5℃、10℃、15℃、25℃、35℃玄武湖底泥释磷室内实验计算玄武湖释磷速率,得出底泥释磷速率与上覆水温度的关系,进而算出玄武湖北湖每年磷释放量为0.815 t,东南湖每年磷释放量为 1.013t,西南湖每年磷释放量为0.266t.玄武湖每年底泥释磷总量为2.094 t.根据费克定理,建立了间隙水扩散模型,利用模型计算玄武湖北湖每年磷释放量为0.799 t,东南湖每年磷释放量为0.983 t,西南湖每年磷释放量为0.232 t.玄武湖每年底泥释磷总量为2.014t.在不考虑外源污染的情况下,由底泥磷释放造成的内源污染使玄武湖磷浓度年均维持在 0.101 mg/L,超过湖泊富营养化磷标准,因此,在切断外源污染的情况下应采取措施治理磷的内源污染.
关键词:  城市湖泊  释磷  间隙水  Fick定律  玄武湖  富营养化
DOI:10.18307/2006.0212
分类号:
基金项目:论文资助来源:国家自然科学基金重点资助项目(50239030);中国科学院知识创新工程项目(KZCX3-SW-348)
Release fluxes estimate of phosphorus in a urban shallow lake:Lake Xuanwu, Nanjing
GONG Chunsheng1, YAO Qi1, FANG Chenxin2, DONG Haoping1, ZHENG Chaohai1, BAO Xianming2
1.Environmental Science and Technology Department,Hohai University, Nanjing 210098, P. R. China;2.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
Abstract:
The phycial and chemical characteristics of the surface sediment of Lake Xuanwu, Nanjing were investi-gated in April-September, 2004 and April-July, 2005. After simulating the phosphorus release in laboratory fromthe surface sediments samples under static conditions under 5, 10, 15,25,35℃, respectively, the release fluxes ofphosphorus across the water-sediment interface in different sub-lakes of Lake Xuanxu were calculated, i. e.0.815 t/a, 1.013 t/a and 0.266 t/a for northern, southeastern and southwestern sub-lakes, separately. The totalrelease flux for Lake Xuanwu could be 2. 094 t/a. Based on the Fick's Law, a pore water dispersion model wasbuild up, and the phosphorus release for the whole Lake Xuan could be calculated as 2. 014 t/a to the water, with0.799 t/a, 0. 983 t/a and 0. 232 t/a for northern, southeastern and southwestern sub-lakes. Such a net releasefrom lake sediment for phosphorus makes an appropriate 0, 101 m/L in lake water-a value exceeding threshold forlake eutrophication-on the year run when excluding the diffusion pollution to the lake. As a result, additional meas-ures should be taken to reduce internal phosphorus pollution even when external pollutants are under control.
Key words:  Urban lakes  phosphorus release  pore water  Fick's Law  Lake Xuanwu
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