九龙江口磷的界面分配和转移

Interfacial distribution and transfer of phosphorus in Jiulongjiang Estuary

1992年8月航次调查结果表明，九龙江口水体中磷的迁移呈保守行为，TP和PP含量随着海水盐度的降低呈增加趋势，DP含量刚好相反；S＜15的低盐区，盐度对磷迁移的影响比较显著。沉积物TP含量与间隙水盐度呈正相关。磷在溶解态／颗粒态之间的分配随着海水盐度提高而增大，但在沉积物／海水和沉积物／间隙水之间的分配则比较稳定。前者多在2ｘ104cm3／g左右，后者基本处在（1～2）X104cm3／g之间。间隙水磷含量明显高于海水，平均富集系数在1．7左右。

Based on the investigation results of 1992-08 Cruise, the interfacial distribution and transfer of phosphorus between seawater,sediment and interstitial water have been studied.The results indicated that the transfer of phosphorus in water column in the Jiulongjiang Estuary follows a conservative mixing process, TP and PP concentrations increase, while DP concentration decreases, as the salinity of seawater decreases. The dissolved phosphorus is the major constituent,being about 70% of the total phosphorus in the water column and the dissolved inorganic phosphorus accounts for 82% of dissolved phosphorus. The phosphorus in sediments is dominated by the inorganic phosphorus and the total phosphorus(TP),posltively correlated to the salinity of the interstitial water. The phosphorus content in the interstitial water is significantly higher than that in the seawater with an average accumulating ratio of about 1, 7. The inorganic phosphorus is also the major species in the intestitial water and the distribution of phosphorus between the dissolved phase and particulate phase are positively correlated with the seawater salinity. Relatively constant distribution of phosphorus have been found between sediment/seawater and sediment/interstitial water,being abaut 2 ｘ104cm3/g for the former and (1 ~2) ｘ104cm3/g for the loter.