高知平野神田低湿地で得られた最終氷期最盛期と後氷期初頭の花粉記録

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タイトル別名
  • Full glacial and early post-glacial pollen records from the Koda Mire in the Kochi Plain, southwestern Japan
  • コウチ ヘイヤ カンダ テイシッチ デ エラレタ サイシュウヒョウキ サイセイキ ト コウヒョウキ ショトウ ノ カフン キロク

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The fossil pollen records from Koda Mire in the Kochi Plain, Shikoku, southwestern Japan, provide a vegetation history surrounding the mire during the full glacial and early post-glacial periods. Based on distribution patterns from representative pollen taxa, three local pollen assemblage zones (KD-I to KD-III) have been identified. The forest vegetation is characterized by the dominance of Quercus subgenus Quercus combined with Tsuga sieboldii, Carpinus, Fagus crenata, Betula, Acer and Corylus (KD-I: ca. 27.8-23.4 cal kyr BP), abrupt decline of T. sieboldii and some of deciduous broad-leaved taxa excluding Q. subgenus Quercus and occurrence of evergreen broad-leaved taxa (KD-II: ca. 10.1-10.0 cal kyr BP), and gradual decline of Q. subgenus Quercus and expansion of evergreen broad-leaved taxa along with Celtis and/or Aphananthe aspera (KD-III: ca. 9.5-8.4 cal kyr BP). Chronologically, zone KD-I correlates with the full-glacial period which is regarded as the cooling phase: 'Heinrich event 2' (between the Dansgaard - Oeschger cycles 3 and 2). Pollen records from Koda Mire and the adjacent area during this period indicate that mixed forest areas, comprising of temperate conifers and deciduous broad-leaved trees, were widely distributed across the Kochi Plain. Futhermore, the records suggest that it may not have served as refugia for Cryptomeria japonica and evergreen broad-leaved trees.

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