Vegetation and Climate History since the Early Last Glacial Period in the Takatomi Lowland, Gifu Prefecture, Central Japan.

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  • Kako Hisanori
    Graduate School of Aichi University of Education
  • Moriyama Akio
    Department of Earth Science and Environment of Aichi University of Education

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Other Title
  • 岐阜県高富低地湖沼堆積物の花粉分析による最終氷期初期からの植生・気候変遷
  • ギフケン タカトミ テイチ コショウ タイセキブツ ノ カフン ブンセキ ニ ヨル サイシュウ ヒョウキ ショキ カラ ノ ショクセイ キコウ ヘンセン

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Abstract

The lacustrine sediments of the Takatomi Lowland include the widespread volcanic ashes called Aso-4, AT, and K-Ah derived from southern Kyushu. The sediments have been deposited continuously since the early Last Glacial Period, marine isotope stage 5b. Pollens from 16.5m boring cores of these sediments were analyzed to discuss the vegetation and climate history, to correlate MIS chronology, and to clarify the distributions of vegetation by correlating other site data at each age. The fossil pollen assemblages from the Takatomi Lowland sediments are divided into ten pollen zones, TK-I to X. At the age of MIS 5b, the Takatomi Lowland was occupied by warm temperate broadleaf forests of Cyclobalanopsis, and the climate was warm and wet. As the pollen grains of Cryptomeria and Sciadopitys were prevalent at the age of MIS 5a, it is thought that there was abundant precipitation. At the age of MIS 4, as the pollen grains of subboreal coniferous trees increase abruptly, it became colder and dryer. At the age of MIS 3, the climate became warmer than at the previous age as the pollen grains of cool temperate deciduous broadleaf forests prevailed. About 31, 000 years ago (MIS 2, full glacial period), the climate became dryer and colder suddenly, as shown by the pollen grains of subboreal coniferous trees and deciduous broadleaf trees such as Betula and Corylus-Myrica, which grow in the cool temperate zone. About 14, 000 years ago, as the pollen grains of coniferous trees disappeared abruptly, a warmer climate increased the pollen grains of deciduous trees such as Lepidobalanus and Corylus-Myrica. In the late glacial period, the pollen grains of Ilex prevailed, and since 3, 000 years ago the pollen grains of the warm temperate evergreen broadleaf forests of Cyclobalanopsis have prevailed. Comparing the pollen assemblage data from the Hokuriku District located along the Japan Sea, the Takatomi Lowland on the Pacific Ocean side was thought to be only at the age of MIS 5a, when the climate was humid as inferred from the presence of pollen such as Cryptomeria and Sciadopitys; but at other ages the Pacific Ocean side was dryer than Japan Sea side.

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