| Experimental research on the impact of Corbicula fluminea on DIN exchange at a tidal flat sediment-water interface |
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| 作者姓名： | 刘杰 陈振楼 许世远 郑祥民 |
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| 作者单位： | Ministry of Education Key Laboratory of Geo-information Science, East China Normal University, Shanghai 200062 |
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| 基金项目： | 国家自然科学基金;上海市科委资助项目 |
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| 摘 要： | Based on a simulative experiment and a comparison analysis, the effect of bivalve Corbiculafluminea activity on sediment-water exchange of dissolved inorganic nitrogen （DIN） is studied. The areas included three intertidal flat sites of the Changjiang （Yangtze） River estuary in China. The interface exchange flux of ammonium, nitrate and nitrite in the short experiment （6 h） was -46.4-40, -74.8-929.1 and 2.5-14.6 μmol/（m^2·h）, respectively. It was found that the burrowing activities of C. fluminea increased NH4 and NOi release from sediments to overlying water in the short-term experiment. During long-term incubation, NH4 and NOi released in turn from the sediments. At the beginning of incubation, bioturbation by C. fluminea could accelerate NH2 release from sediments 2-17 times in different sites, resulting in stronger nitrification and increased NOi concentrations in the overlying water. Sediment profile analysis post-incubation shows that organic matter mineralization and sediment-water NH4 exchange had been stimulated by C. fluminea bioturbation and bioirrigation during the experiment. Therefore, C. fluminea activities such as excretion, burrowing, irrigation and turbation can effectively alter nitrogen dynamics and accelerate and stimulate nitrogen exchange and cycling at the sediment-water interface.
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| 关 键 词： | 长江流域 水下沉积物 冬孢堆护膜 环境保护 |
| 收稿时间： | 9 January 2006 |
| 修稿时间： | 2006-01-09 |
Experimental research on the impact of <Emphasis Type="Italic">Corbicula fluminea</Emphasis> on DIN exchange at a tidal flat sediment-water interface |
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| Liu?Jie,Chen?Zhenlou,Xu?Shiyuan,Zheng?Xiangmin.Experimental research on the impact of Corbicula fluminea on DIN exchange at a tidal flat sediment-water interface[J].Chinese Journal of Oceanology and Limnology,2007,25(4):434-443. |
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| Authors: | Liu Jie Chen Zhenlou Xu Shiyuan Zheng Xiangmin |
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| Institution: | Ministry of Education Key Laboratory of Geo-information Science, East China Normal University, Shanghai 200062 |
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| Abstract: | Based on a simulative experiment and a comparison analysis, the effect of bivalve Corbicula fluminea activity on sediment-water exchange of dissolved inorganic nitrogen (DIN) is studied.The areas included three intertidal flat sites of the Changjiang (Yangtze) River estuary in China. The interface exchange flux of ammonium, nitrate and nitrite in the short experiment (6 h) was -46.4-40,fluminea increased NH 4 and NO-3 release from sediments to overlying water in the short-term experiment. During long-term incubation, NH 4 and NO-3 released in turn from the sediments. At the beginning of incubation, bioturbation by C. fluminea could accelerate NH 4 release from sediments 2-17 times in different sites, resulting in stronger nitrification and increased NO-3 concentrations in the overlying water. Sediment profile analysis post-incubation shows that organic matter mineralization and sediment-water NH 4 exchange had been stimulated by C. fluminea bioturbation and bioirrigation during the experiment. Therefore, C. fluminea activities such as excretion, burrowing, irrigation and turbation can effectively alter nitrogen dynamics and accelerate and stimulate nitrogen exchange and cycling at the sediment-water interface. |
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| Keywords: | Corbicula fluminea sediment-water interface DIN impact Changjiang (Yangtze) River estuary |
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