| 摘要: |
| 利用实验室培养法研究了不同因素对大连湾沉积物-水界面间生物可利用磷(BAP)交换通量的影响, 并利用实验室培养法和间隙水浓度梯度法估算了大连湾已疏浚区和疏浚点邻近海域沉积物-水界面BAP 的交换通量。结果表明, 随着上覆水pH 和温度的增加, BAP 由沉积物向水体释放量逐渐增加灭菌和贫氧条件下, 也会导致沉积物BAP 的释放量增加; 上覆水中磷酸盐浓度的升高会导致BAP 由沉积物向水体释放通量降低, 且随着上覆水磷酸盐浓度的不断升高, BAP 逐渐转化为由水体向沉积物中扩散。实验室培养法和间隙水浓度梯度法测定结果均显示, 受到疏浚工程的影响, 大连湾疏浚点邻近海域沉积物-水界面BAP 的年均通量大于已疏浚区。不同季节, 大连湾沉积物-水界面BAP 的交换通量有所不同, 表现为夏季最高, 冬季最低。但由于受疏浚活动的影响, 冬季疏浚点邻近海域沉积物-水界面BAP 的交换通量也维持在较高水平。 |
| 关键词: 疏浚 沉积物 生物可利用磷 交换通量 |
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| 基金项目:国家自然科学基金项目(40806046); 国家海洋局近岸海域生态环境重点实验室资助 |
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| The influencing factors of BAP exchange flux at the sediment-water interface in Dalian Bay |
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| Abstract: |
| The influencing factors of BAP (bio-available phosphorus) exchange flux at the sediment-water interface in Dalian Bay were studied by laboratory incubation experiment, and the BAP fluxes between sediment and water in the dredged area and in the area near the sediment dredging location were analyzed with the methods of laboratory incubation experiment and nutrient concentration gradients in the pore water. The results showed that the fluxes of BAP from sediment to water increased with the increase of pH and temperature in overlying water, and it also increased by the condition of applying sterilized sediment and aerating in overlying water during the incubation experiment. The fluxes from sediment to water decreased when the concentrations of phosphorus increased in the overlying water, and the flux direction reversed with the continuous increase of the concentrations. Both results of the two methods showed that the annual average exchange flux of BAP between sediment and water in the area near the sediment dredging location was higher than that in dredged area affected by dredging works. The exchange fluxes of BAP between sediment and water in Dalian Bay were different in four seasons, which was highest in summer and lowest in winter. However, it was at a high level in the area near the sediment dredging location in winter due to the impact of dredging. |
| Key words: dredging sediment bio-available phosphorus exchange flux |
