소양호에서의 Alkaline phosphatase 활성도의 Kinetics = On the Kinetics of Alkaline Phosphatase Activity in Lake Soyang

다국어 초록 (Multilingual Abstract)

The kinetics of alkaline phosphatase activity were studied at the surface of a warm monomictic large reservoir, Lake Soyang, every two months from February 1988 to June 1989. Three sampling stations were located at the dam site, near a large netcage-type fishfarm, and a tributary stream inlet region where the dinoflagellate blooming occurs in warm seasons. Vmax of alkaline phosphatase, showing the range of 0.02∼5.95 μM/1/hr, was high during the spring bloom, April and June, and low during the turnover time, October, December, and February. Kt+Sn, showing the range of 0.06 ∼31.0 μM/1, was high during the turnover time, which seems to be caused by the nutrients supply from the hypolimnion. Kt+Sn was much higher during turnover time at the fishfarm station than other stations, which is obviously resulting from the large amount of fecal deposition at the bottom and the diffusion of organic phosphorus upto the surface. It seems that at high density phytoplankton itself can be the substrate for alkaline phosphatase, since the peak time of Kt+Sn coincided with the peak of chlorophyll a concentration in the shallow stream inlet station where dinoflagellates aggregate.