Spatial changes in the distribution of Cryptomeria japonica since the last interstade in Shikoku Island, southwestern Japan

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  • 四国地方における最終亜間氷期以降のスギの空間分布の変遷

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Abstract

Spatial changes in the distribution of Cryptomeria japonica D. Don since the last interstade were reconstructed based on the pollen records from Shikoku Island, southwestern Japan. During the last interstade, C. japonica was dominant throughout the island and then conspicuously declined toward the end of this period, except around the Ikeyama-ike Bog, Muroto Peninsula on the Pacific Ocean side of Shikoku Island. During the pre-full glacial to late glacial periods, C. japonica was not abundant on Shikoku Island, except around the Ikeyama- ike Bog and Azono Valley on the Kochi Plain. The occurrence of Cryptomeria pollen during this period implies that these areas served as refugia for C. japonica during the full-glacial period. During the early part of the post-glacial period, warm-mixed/broad-leaved evergreen forests dominated by Quercus subgen. Cyclobalanopsis and Castanopsis rapidly expanded in the coastal region on the Pacific Ocean side. However, C. japonica was not a co-dominant component in these forests throughout this period, except in the areas around several sites such as the Ikeyama-ike Bog, where C. japonica rapidly increased in quantity during the late part of this period.

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