The Last Glacial and Postglacial Pollen Assemblages at Fusedame Pond, South-eastern Part of Ohmi Basin, Japan

Abstract

The Last Glacial and Postglacial vegetation were reconstructed from a palynological study on the pond and peat bog sediments intercalating a widespread tephra known as the Aira-Tn ash(AT), at Fusedame pond located in the south-eastern part of Ohmi Basin. Around a time of AT falling in the Last Glacial period, mixed forests of conifers, such as Pinus subgen. Haploxylon, Picea, Abies and Tsuga, and broad-leaved deciduous trees, such as Quercus subgen. Lepidobalanus and Betula,were existed in the area surrounding peat bog and wet land thickly covered with A/nus and Myrica. During Kodai and Chusei Periods, Fusedame pond was created at moor, where Myriophyllum, Brasenia and Nymphoides indica grew. Around the pond, the vegetation changed from evergreen broad-leaved forest to pine forest, influenced by human activities.