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通过为期一年的疏浚模拟试验,在试验室培养疏浚与对照柱样研究了底泥疏浚对内源磷释放的控制效果.结果发现,疏浚表层30cm能够有效的消减沉积物中不同形态磷含量与孔隙水中PO_4~(3-)-P含量.在一年的试验周期内,疏浚和对照柱沉积物-水界面的PO_4~(3-)-P通量分别为-143.8至14.4与-237.3至3047.6μg/(m~2·d),疏浚柱沉积物-水界面的磷通量总体上低于未疏浚对照的磷通量,尤其是在温度较高的月份,从2006年3-10月疏浚柱沉积物-水界面磷释放通量显著低于未疏浚对照柱,疏浚沉积物的磷的释放潜力低于未疏浚对照沉积物研究结果表明,在外源磷得到有效控制的前提下,底泥疏浚是消减研究区内源磷负荷有效的技术手段.
Through the one-year dredging simulation experiment, dredging and control columns were cultured in the laboratory to study the control effect of sediment dredging on endogenous phosphorus release.The results showed that dredging the surface layer 30cm can effectively reduce the phosphorus content in different sediments PO_4 ~ (3 -) - P content in pore water. The PO_4 ~ (3 -) - P fluxes in the sediment-water interface of dredging and control columns were -143.8 to 14.4 and -237.3 to At 3047.6μg / (m ~ 2 · d), the phosphorus flux at the sediment-water interface of dredged column was generally lower than that of the dredged control, especially in the months with higher temperature. From March to October 2006 The phosphorus release flux at the sediment-water interface of dredged column was significantly lower than that of non-dredged control column, and the release potential of phosphorus in dredged sediment was lower than that of non-dredged control sediment. The results showed that under the premise of effective control of exogenous phosphorus, Dredging is an effective means of reducing the source phosphorus load in the study area.