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| Diffusion Fluxes of Phosphorus Across Water-Sediment Interface in Lake Wuliangsuhai and Daihai |
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| KeyWord:diffusion fluxes; phosphorus; water-sediment interface; lakes |
| Author Name | Affiliation | | GUAN Rui | College of Environment and Resources, Inner Mongolia University | | LV Chang-wei | College of Environment and Resources, Inner Mongolia University
Institute of Environmental Geology, Inner Mongolia University | | HE Jiang | College of Environment and Resources, Inner Mongolia University
Institute of Environmental Geology, Inner Mongolia University | | WANG Jing-hua | College of Environment and Resources, Inner Mongolia University | | HOU De-kun | College of Environment and Resources, Inner Mongolia University | | XIE Zhi-lei | College of Environment and Resources, Inner Mongolia University |
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| Abstract: |
| Taking the Wuliangsuhai and Daihai Lake as research objects, the diffusion fluxes of dissolved organic phosphorus（DOP）, dissolved total phosphorus（DTP） and dissolved orthophosphate（DRP） across the water-sediment interface were investigated in this work by employing columnar simulation method. The results showed that DTP and DOP released from sediment of Lake Wuliangsuhai to overlying water, while it was diametrically opposite that DTP and DOP diffused from overlying water to sediment cores of Lake Daihai. The diffusion kinetics of DOP and DTP could be well fitted by negative power exponent function and logarithmic function. According to the estimate results of diffusion fluxes, there were approximately 19.81 t of DTP and 33.43 t of DOP entering overlying water while 13.95 t of DRP sinked in sediments across the water-sediment interface in non-Phragmitescommunis area of Lake Wuliangsuhai during 90 days in summer. It indicated that the sediments from non-Phragmitescommunis area of Lake Wuliangsuhai act as source（for DOP and DTP） and sink（for DRP） for different phosphorus forms. Approximately 13.29 t of DTP and 21.40 t DOP sinked in sediments while 8.69 t of DRP entering overlying water across the water-sediment interface, which indicated that the sediments from Lake Daihai act as source（for DRP） and sink（for DOP and DTP） for different phosphorus forms. So the organic phosphorus could directly take part in recycle or through the indirect way of mineralization degradation in the lake ecosystems. This study revealed the significance of organic phosphorus as bio-available phosphorus pool and impacts of its diffusion across the water-sediment interface on lake eutrophication. As potential nutrient pool, it should be given more attention on organic phosphorus. |
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