The paper for the 2015 Japan Association for Quaternary Research Academic Award Plio-Pleistocene geomorphological development of the Japanese Islands and floral and vegetation changes

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  • 鮮新・更新世の日本列島の地形発達と植生・植物相の変遷
  • 2015年日本第四紀学会学術賞受賞記念論文 鮮新・更新世の日本列島の地形発達と植生・植物相の変遷
  • 2015ネン ニホン ダイシキ ガッカイ ガクジュツショウ ジュショウ キネン ロンブン センシン ・ コウシン セイ ノ ニホン レットウ ノ チケイ ハッタツ ト ショクセイ ・ ショクブツソウ ノ ヘンセン

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Abstract

<p>This paper reviews the influence of Plio-Pleistocene geomorphological development on floral and vegetation changes in and around central Japan. Because Metasequoia was included in fossil assemblages in the glacial stage in the lower Pleistocene Shobudani Formation, the cause of its extinction from Japan was ascribed to geomorphological changes in its habitat. Plant extinction and the appearance of cool temperate plants in the central Kinki District converged on a period of geomorphological changes in and around sedimentary basins with climate cooling. To clarify the cause of plant extinction, the relationship between plant distributions and paleotopography around the sedimentary basin was analyzed based on the taphonomy of plant fossil assemblages. In consequence of the upheaval of the mountains, some plants were obstructed in their regional expansion during interglacial stages and confined to southwestern Japan, and they finally became extinct from Japan. The dry climate prevailing during the last glacial maximum promoted expansion of subalpine conifers on dry habitats in cool temperate zones and confined distribution of temperate deciduous broadleaf trees in mesic places within valleys.</p>

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