九龙江河口春季磷的形态分配及浮游植物对磷的响应

The Constituent Distribution of Phosphorus to Phytoplankton of Jiulong River Estuary in Spring

以石码河口及上游水域为研究对象,2007年5月对表层水中不同形态的磷及浮游植物生物量叶绿素a(Chla)进行了调查,分析河口磷形态分配的影响因素及与浮游植物生物量的关系。以颗粒态有机磷(POP)为主的颗粒态磷(PP)占总磷的61.2%;溶解态无机磷(DIP)占溶解态磷(TDP)的72.8%。河口区上游磷与河口磷的组成相似,雨水的淋洗作用对水体中磷的组成有较大影响,以颗粒态无机磷(PIP)的显著增高为特征。水中Chla与TP和DOP存在极显著的正相关,表明生物活动在一定程度上控制着该水域表层水中磷形态的分布。

The different forms of phosphorus and the phytoplankton biomass （Chla） was investigated in shima estuary and its upper reaches in May 2007. The results showed that the particulate organic phosphorus, which was the main component of the particulate phosphorus, was the primary state of phosphorus in shima estuary, and its content accounted for 61.2% of total phosphorus. Meanwhile, the dissolved inorganic phosphorus was the main constituent of the dissolved phosphorus for its content accounted for 72.8% of the dissolved phosphorus. The phosphorus composition of the upper reaches was similar to that of estuary. The research also found that the rainwater leaching effect had a greater impact on the composition of phosphorus ; especially the significant increase of the particulate inorganic phosphate was taken as the main feature. Phytoplankton biomass in estuary showed a significantly positive relationship with the total phosphorus and the dissolved organic phosphorus and it indicated that the algae activity in surface water affected the distribution of phosphorus heavily in the estuary.