博多湾御島干潟における環境修復

概要

論文の詳細を見る
In the semi-closed marine waters of Hakata bay we have been promoting environmental restoration and species diversity with a variety of measures. These include the remediation of sea bottom sediment by sand capping, the acceleration of water outflow by digging trenches, and the creation of extra habitat by planting eelgrass. By monitoring, we confirmed the fact that water conditions of the semi-closed area became better due to improvements in the quality of inflowing river water. Initially, benthic animals, fish and algae populations propagated rapidly as the river water and bottom sediment quality improved. But clay and sulfide content in the bottom sediment increased and the populations of benthic animals began to decrease four years after the sand capping. Nevertheless, a wide variety of benthos species continue to be observed which means the efficacy of the restoration measures still endures.
2009-03-15