| 要旨トップ | 日本生態学会全国大会 ESJ55 講演要旨


一般講演(ポスター発表) P2-041

Effect of channel morphology on FPOM transport distance based on dam originated plankters as tracer

*玉基英(京都大・工), 竹門康弘(京都大・防災研), 山本佳奈(京都大・工), 一瀬諭(琵琶湖環境研)

The balance of supply, transport and retention of FPOM(fine particulate organic matter) plays a key role as energy resources to river ecosystem. This study aims to show the relations of channel morphology to FPOM dynamics using the lake originated plankters as FPOM tracers. We estimated a transport distance of suspended FPOM by calculation of the decreasing ratio of the lake originated plankters with channel distance. Hydraulic radius was adopted as an index of channel morphologic complexity and its influence on FPOM transport distance was analyzed. Study sites were established in two artificial canals from lake Biwa and two natural rivers with different channel morphology below dam reservoir.

Results showed that the lake originated plankters were suitable for quantitative FPOM tracers in streams below dam reservoir. The FPOM transport distance in each stream decreased exponentially with channel distance, but the decreasing ratio had a negative correlation with the hydraulic radius. This result indicates increasing complexity of channel morphology will increase the FPOM retention efficiency.

日本生態学会