Analysis of sedimentary organic carbon dynamics in Lake Izunuma using by current flow and fatty acid biomarker.

Abstract

 Eutrophication in closed water areas have been one of the most serious environmental concerns in all over the world. Not only water quality but also bottom sediment quality should be improved against for eutrophication. We investigated current flow, sedimentary organic carbon and fatty acid composition of bottom sediments in Lake Izunuma which is one of the most famous closed water lakes as eutrophic lake in Japan. There was negative relationship between exceedance probability of current velocity and sedimentary organic matter. Fatty acid analysis revealed the origin of organic carbon in bottom sediment was mainly higher plants. These results indicated the control of current flow and higher plants are required to manage closed water area.