プラント・オパ-ルからみた稲作農耕の開始と土地条件の変化 (東アジアと日本の遺跡をめぐる古環境特集号)

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概要

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• Based on archaeological excavation, geomorphological analysis and plant opal analysis, aspects of rice cultivation from the Latest Jomon to the Yayoi period (3, 000-1, 700 years BP) are described. Changes in land conditions from the Yayoi period to the 15-16th centuries are also examined.The expansion pattern of rice cultivation was analyzed pottery with rice grain impressions rice remains, plant opals, fossil pollen and ancient paddy fields. It was revealed that each element expanded at a characteristic speed. The pattern can be divided into two stages. The first stage is a period when each cultural element gradually expanded in its own characteristic way. In the second stage those elements intensively came together to establish the means of rice cultivation. Chronological and regional differences were also recognized in the distribution of paddy fields. The differences were largely dependent on the varieties of the rice plant. An early-ripening rice plant was assumed to have expanded fairly rapidly to the Chubu and Tohoku districts in the Yayoi period (2, 300-1, 700 years BP).Periods of changeable land conditions were found by quantitative plat opal analysis. Those were from the end of the Early Yayoi through the beginning of the Middle Yayoi period (about 2, 100 years BP), from the Later Yayoi to the Early Kofun period (1, 900-1, 600 years BP), at the end of Ancient Times (about 900-800 years BP), and the 15-16th century. The changes in land conditions corresponded to geomorphological changes caused by terrace formations of floods, and also were closely related to land use humans.

• 日本第四紀学会の論文

著者

• 外山 秀一

  皇学館大学文学部

関連論文

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• プラント・オパ-ルからみた稲作農耕の開始と土地条件の変化 (東アジアと日本の遺跡をめぐる古環境特集号)

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