Ancient agricultural land-use inferred from pollen and seed analysis at the Nagahara NG02-8 site, Osaka, western Japan

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  • 大阪市長原遺跡の畠状遺構における花粉・種実分析に基づく耕地利用評価
  • オオサカシ ナガハラ イセキ ノ ハタケジョウイコウ ニ オケル カフン シュジツ ブンセキ ニ モトズク コウチ リヨウ ヒョウカ

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Abstract

The use of ancient fields with undulating, rippled surface patterns (indicating, in parallel-arranged ditches, a furrow-like structure) was investigated at the Nagahara NG02-8 site. The site, dating from the early Nara period (8th-century), was studied in comparison with two neighboring sites of similar structure. The fossil assemblage of pollen and seeds from the cultivated layer at Nagahara NG02-8 was mainly composed of wetland and aquatic plants, describing a wetland environment for the field during the period of its use. Pollen grains of Fagopyrum and Oryza, possibly implying cultivated plants, were also detected. Higher percentage occurrence of Oryza pollen with carbonized rice in the wetland indicates paddy rice cultivation in the field. Plant fossils at the two other sites, along with their geographical conditions and differing furrow structures, indicate that dry-land rice was likely cultivated at the Nagahara NG03-5, and paddy rice at the Uriwari UR00-8. Our results suggest that, without detailed study, a furrow-like structure does not always mean that a site was farmed, much less that it was used as a rice paddy.

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