河口悬浮物与海洋近岸表层沉积物中磷的海洋浮游藻类生物测定

利用九龙江口、黄河口悬浮物和厦门湾、泉州湾近岸表层沉积物作为磷源，用分批培养法培养中肋骨条藻（Ｓｋｅｌｅｔｏｎｅｍａｃｏｓｔａｔｕｍ），聚生毛角藻（Ｃｈａｅｔｏｃｅｒｏｓｓｏｃｉａｌｉｓｔ），小球藻（Ｃｈｌｏｒａｌｌａ），均可正常生长，说明在磷饥饿状态下，样品中潜在生物可利用磷可转化并释放到水相，以供藻类生长之需．培养体系中藻类对磷的摄取与磷自样品中的转化释放处于动态平衡状态．藻类在稳定生长期大量排出胞外产物．胞外产物中的强螯合基团与样品中铁等金属元素的络合作用，是培养体系中潜在生物可利用磷转化释放的可能机制之一．

Marine Algae Bioassay with Phosphorus in Estuarine Suspended Matters and Coastal Surface Sediments

This study was desiged to asses the marine algae availability of P in estuarine suspended matters and coastal surface sediments. When P-deficient marine algae Skeletomena costatum, Chaetoceros socialist and Chloralla were cultured in DRP-free medium but using suspended sediment as the sole P source,algae grew normally. It implied that the potential bioavailable P in the samples can released to water phase during incubation under P - deficinet status, and maintain algae growth. The release of P from samples and the utilization of P by algae were kept in a dynamic equilibrium. The algae excrete a variaty of organic subatances (exudate) during stationary growth period. The complexation of the strong chelate groups in the exudate with Fe and other metals in the samples may be the meChanism which is responsible for potential bioavailable P.