人工氾濫を有する広島県霧ケ谷湿原における河川水・栄養塩動態

抄録

Nature Restoration Project in Yawata Wetland was performed from 2006 to 2008. It aimed for the restoration of the mire vegetation by the works of Neo-Natural River Reconstruction and the construction of sub-channels in the wetland. In this study, river water and nutrient dynamics in the Kirigatani Wetland are observed, and the validity of the artificial flooding to the wetland is discussed.

The field observations in Kirigatani Wetland were conducted to know river water and nutrient dynamics. As a result, water accumulate in the wetland during the high-water term, on the other hand, water are supplied from the wetland to the main channel during the term of ordinary discharge. These results indicate that the artificial flood, induced by sub-channels, enable the wetland to keep the water and nutrients.