Conditions about the Diffusion of Wet Rice Cultivation Based on a New Chronology

本文旨在分析弥生时期初至柔门期末期，近木地区3个地区(京都盆地、大阪平原、大阪与神户之间)考古遗址分布的变化。我们采用了一种新的年表，认为陶器从柔门期末到弥生期初的过渡是连续的。结果表明，在大阪-神户之间地区，遗址数量减少不明显，但在大阪平原和京都盆地，遗址数量在绳门期末期减少，之后恢复。与此同时，这些网站的搬迁也很频繁。湿稻种植在场地数量减少后蔓延的情况在九州北部是常见的。我们可以假设，在这两个地区推广湿稻种植的背后，是一个严重的气候变化。

The purpose of this study is to analyze how the distribution of archaeological sites changed in 3 areas (Kyoto Basin, Osaka plains, the area between Osaka and Kobe) of the Kinki district at the beginning of Yayoi period from the end of Jomon period. We adopt a new chronology that the transition of pottery from the end of Jomon period to the beginning of Yayoi period is continuous. As a result, in the area between Osaka and Kobe, decrease of number of the sites is not outstanding , but in Osaka plains and the Kyoto Basin, number of the sites decrease at the very end of Jomon period and recover afterwards. At the same period, the sites move frequently. The aspect that wet-rice cultivation spreads over after the decrease in the number of sites is common with Northern Kyushu. We can suppose a serious climate change behind the diffusion of Wet Rice Cultivation in both the areas.