Last 12000 years vegetation history in and around the Furano basin, central Hokkaido, Japan
2005
Igarashi, Y.(Tokyo Univ. (Japan)) | Narukawa, J. | Katoh, T.
Peat sediments obtained from Higashi Torinuma and upper moor areas in Todai Enshurin in and around the eastern Furano Basin, central Hokkaido were analyzed for pollen and carbon-14 datings. In the basin areas, the main forest components changed from Abies, Picea, Betula and Juglans (9 - 8 ky BP- thousand years before the present) to Quercus and Abies (8 - 5 ky BP) and then to Quercus and Alnus (5 - 4 ky BP) and finally to Quercus, Abies and Picea (4 ky BP - present). Quercus became dominant under the warm climate during the period from 8 to 4 ky BP. At 4 ky BP Abies and Picea increased in extent, and the present Pan-mixed forest was formed. Areas of moor have developed in the basin at least over the past 9,000 years. In the highland moor, subarctic forest composed of Picea, Larix, Pinus and Abies, and grassland developed on landslide sites between 12 and 11 ky BP. Moor occurred at 11 ky BP and the main forest components changed to Picea, Betula and Abies. Larix survived until 8 ky BP. Between 8 and 4 ky BP Quercus was the dominant tree at the same as it dominating the basin areas, though Juglans migrated to the highlands later than its maximum period in the basin. The increase in the area of Picea, Abies and the sudden demise of Quercus happened at 4 ky BP. Development of Picea reached to the present scale at 2 ky BP.
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