抄録
The field observations on water quality and amount of organism: detritus, attached alge and benthic animal were conducted at several points in Saba River and Ashida River of Chugoku District, which have a different characteristic of land load. An ecosystem assessment method based on exergy efficiency was applied to these rivers, and were compared with that using water quality and biodiversity of benthic animal. The result shows that the exergy efficiency can clarify the difference of the soundness of river ecosystem between the observation points of Saba River and Ashida River, and correlates with the biodiversity of benthic animal, which is not clearly related to the water quality.
