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于1995年3、5月在九龙江口进行两个航次的现场调查，研究不同形态磷的河口行为，并估算生物可利用磷的入海通量。结果表明，在S＜20区域内，溶解活性磷（DRP）的行为受控于“缓冲机制”，其含量在8～10μg／dm3水平上下波动。颗粒磷中MgCl2。可提取磷（MgCl2-P）含量随盐度增大而增大，并与叶绿素a以及悬浮物中Fe、Mn、Al含量呈正相关关系。NaOH／NaCl可提取磷（NaOH／NaCl－P）随盐度增大按指数关系下降，其含量与悬浮物中Fe、Mn、Al含量呈正相关关系。HCl可提取磷（HCl－P）在河口区的行为表现为保守混合。九龙江口生物可利用磷入海通量约517t／a，其中潜在生物可利用磷（PBAP）的贡献为溶解活性磷（DRP）的3倍。
In March and May 1995, a field survey of two voyages at the Jiulong River Estuary was conducted to study the behavior of estuaries with different forms of phosphorus and to estimate the flux of bioavailable phosphorus into the sea. The results showed that the dissolved phosphorus (DRP) was controlled by the “buffering mechanism” in the S <20 region, and its content fluctuated at the level of 8-10 μg / dm3. Particulate phosphorus in MgCl2. The content of extractable phosphorus (MgCl2-P) increased with the increase of salinity, and was positively correlated with the content of chlorophyll a and the content of Fe, Mn and Al in suspended solids. NaOH / NaCl extractable phosphorus (NaOH / NaCl-P) decreased exponentially with the increase of salinity, and its content was positively correlated with the content of Fe, Mn and Al in suspended solids. The behavior of HCl-extractable phosphorus (HCl-P) in estuarine areas was shown to be conservatively mixed. The available flux of phosphorus into the sea of Jiulong estuary is about 517t / a, of which the potential contribution of bioavailable phosphorus (PBAP) is 3 times that of dissolved active phosphate (DRP).