| 关 瑞,吕昌伟,何 江,汪精华,侯德坤,谢志磊.乌梁素海和岱海水-沉积物界面磷的扩散通量研究[J].农业环境科学学报,2013,32(8):1609-1617. |
| 乌梁素海和岱海水-沉积物界面磷的扩散通量研究 |
| Diffusion Fluxes of Phosphorus Across Water-Sediment Interface in Lake Wuliangsuhai and Daihai |
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| DOI：10.11654/jaes.2013.08.018 |
| 中文关键词: 扩散通量 磷 水-沉积物界面 湖泊 |
| 英文关键词: diffusion fluxes phosphorus water-sediment interface lakes |
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| 中文摘要: |
| 以乌梁素海（WLSH）和岱海（DH）为研究对象，采用柱状芯样模拟法，开展了湖泊水-沉积物界面溶解有机磷（DOP）、溶解性总磷（DTP）及溶解性正磷酸盐（DRP）的扩散通量研究。结果表明，乌梁素海2个柱芯中DTP和DOP通过水-沉积物界面向上覆水转移扩散，而岱海3个沉积柱芯中DOP和DTP则由上覆水通过水-沉积物界面向沉积柱芯迁移扩散，并分别符合负的幂指数或对数函数的释放规律。据扩散通量结果估算，在夏季90 d的时间内，乌梁素海明水区沉积物约向上覆水体释放了19.81 t的DTP和33.43 t的DOP，由上覆水体迁移至沉积物中的DRP约为13.95 t，明水区沉积物表现为DOP和DTP的源及DRP的汇；由岱海上覆水体迁移至沉积物中的DTP和DOP分别约为13.29 t和21.40 t，由沉积物释放至上覆水的DRP约为8.69 t，岱海沉积物表现为DTP和DOP的汇及DRP的源。揭示湖泊生态系统中，有机磷可以直接或经矿化降解的间接形式参与再循环，成为湖泊初级生产力的重要营养源，表明有机磷作为生物有效磷库的重要性及其在水-沉积物界面的环境地球化学行为对湖泊富营养化的重要影响。 |
| 英文摘要: |
| 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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