Distribution of Different Forms of Phosphorus and Phosphate-solubilizing Bacteria in the Lake Sediments of Kidoike, Maruike and Nakanuma

Abstract

The seasonal distribution of phosphorus and phosphate-solubilizing bacteria (PSB) was investigated from 1988 to 1989 in the surface of sediments (0-12cm layer) in Lake Kidoike, Lake Maruike and Lake Nakanuma. Inorganic phosphorus constituted 65 to 85% of total phosphorus in Lake Maruike and Lake Nakanuma, while it was 35-45% in Lake Kidoike which contained predominantly organic carbon. Fe bound phosphorus indicated seasonal variation in all sediment samples. PSB ranged from 10⁴ to 10⁶·g^-1 sediments. Aerobic PSB were significantly correlated with the concentration of inorganic phosphorus (especially Fe bound P, Ca bound P and labile P). This suggests a possibility of solubilization in phosphorus by aerobic PSB.