| 城市浅水型湖泊底泥释磷的通量估算—以南京玄武湖为例 |
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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[J].湖泊科学,2006,18(2):179-183. |
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| 作者姓名： | 龚春生 姚琪 范成新 董浩平 郑超海 包先明 |
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| 作者单位： | 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,南京,210008 |
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| 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) |
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| 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．
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| 关 键 词： | 城市湖泊 释磷 间隙水 Fick定律 玄武湖 富营养化 |
| 收稿时间： | 2004-12-06 |
| 修稿时间： | 2005-08-17 |
Release fluxes estimate of phosphorus in a urban shallow lake:Lake Xuanwu, Nanjing |
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| GONG Chunsheng,YAO Qi,FANG Chenxin,DONG Haoping,ZHENG Chaohai and BAO Xianming.Release fluxes estimate of phosphorus in a urban shallow lake:Lake Xuanwu, Nanjing[J].Journal of Lake Science,2006,18(2):179-183. |
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| Authors: | GONG Chunsheng YAO Qi FANG Chenxin DONG Haoping ZHENG Chaohai and BAO Xianming |
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| Institution: | 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 |
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| Abstract: | The phycial and chemical characteristics of the surface sediment of Lake Xuanwu, Nanjing were investigated in April-September, 2004 and April-July, 2005. After simulating the phosphorus release in laboratory from the surface sediments samples under static conditions under 5 ,10,15 ,25 ,351 , respectively, the release fluxes of phosphorus 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 total release flux for Lake Xuanwu could be 2. 094 t/a. Based on the Fick's Law, a pore water dispersion model was build up, and the phosphorus release for the whole Lake Xuan could be calculated as 2. 014 t/a to the water, with 0.799 t/a, 0. 983 t/a and 0. 232 t/a for northern, southeastern and southwestern sub-lakes. Such a net release from lake sediment for phosphorus makes an appropriate 0. 101 mg/L in lake water-a value exceeding threshold for lake eutrophication-on the year run when excluding the diffusion pollution to the lake. As a result, additional measures should be taken to reduce internal phosphorus pollution even when external pollutants are under control. |
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| Keywords: | Urban lakes phosphorus release pore water Fick's Law Lake Xuanwu |
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