Abstract
Korea has a large number of irrigation reservoirs and small streams. Periphyton is one of key factors to affect the self-purification of the local aqua system. This study presents a partial result of the investigation on the growth of periphyton at three particular natural sites; pool (P-1 and P-2), laminar flow zone (L-F) and riffle (R-1).Observation was performed mainly with flow velocity. From the test of site and laboratory, the larger biomass of periphyton was found in the riffle (R-I), where faster current velocity was observed, than in the pools. A threshold velocity distinguishing the current velocity dependency of periphyton attachment was about 0.11 ∼ 0.12 m/s. A high organic ratio of carbon to nitrogen, 9.22, was observed at the pool (P-2), while a lower ratio, 5.4, was observed at the laminar zone (L-F).
