Exchangeable Inorganic Phosphate in Lake Sediments.

摘要

The quantity of available P in selected sediments was evaluated by measurement of the amounts of P removed from sediments by Myriophyllum spicatum L. grown in columns containing sediment as the sole P source and amended with other essential nutrients. The relationships between the amount of sediment inorganic P added,the yield and P content of the plants,and the uptake of sediment inorganic P were evaluated. Available P comprised from 12.3to 17.2% of total sediment inorganic P for the eight lake sediments investigated. Relationships between P uptake by Myriophyllum plants (micrograms phosphorus/gram of sediment) and the total inorganic phosphate, nonoccluded inorganic phosphate and total exchangeable inorganic phosphate contents of sediments were evaluated.