東京湾堆積物中の燐の形態と鉛直分布

概要

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The procedure consisting of successive extractions with 0.5N HCI and 0.05N NaOH at room temperature and 0.05N NaOH at 90°C was applied for studying the phosphorus in the core samples from Tokyo Bay. Most (77-88%) of the phosphorus was extracted from the sediments using the procedure throughout the core. The fraction extracted with 0.5N HCI was composed of inorganic phosphorus exclusively, ranging from 38 to 67% of the total phosphorus in the combined extracts. The alkaline extractable fraction was composed of organic-and inorganic-phosphorus in nearly same ratio. The cores analyzed in this study showed a decrease in phosphorus with sedlment depth. In an approach, the mineralization rates of organic matter in the sediments were estimated from the vertical profiles of organic carbon and phosphorus. The rate constants for phosphorus lay between 1.6 ?? 2.6×10-2 yr-1, which were about two oredrs of magnitude lower than those of a mixture of zoo-and phyto-plankton collected from overlying waters. From this, it was concluded that almost all of the easily accessible and metabolizable organic phosphorus (>90%) is miner-alized in a water column and in the water-sediment interface before burial, and that only a small fraction remaining as refractory organic matter goes on decomposing gradually in the sediments for a long time.
日本水産學會の論文