抄録
Vertical distribution was studied regarding the chlorophyll degradation product (phaeophytin), organic carbon, organic nitrogen and ignition loss in sediments of Lake Tega-numa.
The content of phaeophytin was lager in the upper layers and remarkably decreased with core depth. The correlation was obtained between organic carbon and ignition loss, organic nitrogen and ignition loss, and, organic carbon and organic nitrogen. The values of the carbon/nitrogen ratio in sediments was 10-16 in the upper layers and 16-29 in the deeper layers. In the upper layers the correlation was observed between the carbon/nitrogen ratio and the contents of phaeophytin.
The origin of organic substances in sediments of Lake Tega-numa is inferred phytoplankton in the upper layers and undecomposed plant in the deeper layers.
