巨椋池・横大路沼干拓地の表層土壌中における水生植物散布体の残存状況とその鉛直分布

概要

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The nature restoration of wetlands is strongly required as they have been severely altered. We focused on the drained lands, widely spread in the 20th century. It is important to study the diaspores of aquatic plants in the soil to grasp the regeneration potential of the drained lands. The purpose of this study was to reveal the vertical distribution of diaspores of aquatic plants in the soil of Oguraike and Yokoojinuma drained lands, where more than 50 years passed after the reclamation. The soil cores with the length of 50 cm were collected from nine locations. The cores were cut into five sections and studied on the germination ability of the diaspores in the soil under 0-cm and 5-cm depth of water. As a result, we found that the number of species and individuals exponentially decreased when depth of soil sampling became greater. Six endangered plant species were germinated in the experiment and the two among them were the species that could not be found on site at the locations of soil core samplings.