771. PALYNOLOGICAL STUDY OF 200-METER CORE SAMPLES FROM LAKE BIWA, CENTRAL JAPAN : I : THE PALAEOVEGETATIONAL AND PALAEOCLIMATIC CHANGES DURING THE LAST 600, 000 YEARS

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  • 771. 琵琶湖底 200m ボーリング・サンプルの花粉学的研究 : I : 過去 60 万年間の古植生と古気候の変遷
  • 琵琶湖底200mボーリング・サンプルの花粉学的研究-1-〔英文〕
  • ビワ コテイ 200m ボーリング サンプル ノ カフンガクテキ ケンキュウ

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Abstract

The samples of a 200-meter core obtained from the present bottom in Lake Biwa, Central Japan for the investigations of the palaeoclimatic and palaeovegetational changes in and around the lake during the last 600, 000 years can be divided into 19 pollen zones from the view point of palynology. The palaeoclimatic change and the ages of glacial and interglacial stages display similarity to the palaeotemperature curve by oxygen isotope ratio determination from the Caribbean Sea. During the glacial stages or stadials, the typical vegetation thriving today in the Subpolar or Subalpine zone of Japan prevailed at the summit area and/or the montane area around Lake Biwa, and in the lowland around the lake, plants growing today in the Cool Temperate zone were distributed. In the interglacials and interstadials, the palaeovegetation in the higher area was characterized mainly by plants of the Cool Temperate zone and the present Temperate zone, and in the lowland, the palaeovegetation was composed mainly of broadleaved deciduous and evergreen trees growing in the Warm Temperate zone.

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