Migration and development for Cryptomeria japonica since the last glacial period in western Japan

根据这项研究和以往的孢粉学资料（Takahara and Takeoka, 1992; Takahara et al., 1999），可以清楚地看出，日本柳杉在日本西部日本海沿岸走廊一带有全冰川避难所。本研究的证据证实了c.a japonica refugia （Tsukada, 1980; 1982; 1986）的推论。此外，本研究还表明，古奥基半岛的粳稻种群数量大于日本西部其他地区。在Wakasa Bay地区，该物种在全新世早期突然增加，然后在整个全新世扩散（Yasuda, 1982; Takahara and Takeoka, 1992; Takahara et al., 1999）。另一方面,湖周围真嗣,冲电气岛南部位于日本海沿岸附近的中间Chugoku地区发展C.japonica全新世早期并不明显(馆,1977),可能是因为从Palaeo-Oki C.japonica半岛向南迁移到目前沿海地区的中产Chugoku地区被迅速上升的海平面阻止late-glacialyptomeria山茶花粉百分比在18000,11000,8000,6000,用经纬度图和经纬度高度图对4000年和2000年的日本西部地区进行了整理。这些图显示了从末次盛冰期到全新世晚期日本隐藓的迁移和发育。

Based on this study and previous palynological data (Takahara and Takeoka, 1992 ; Takahara et al., 1999), it is clear that Cryptomeria japonica had full-glacial refugia along the coastal corridor of the Sea of Japan, western Japan. The inference of C.japonica refugia (Tsukada, 1980 ; 1982 ; 1986) is confirmed by the evidence from Oki Islands of this study. Also, this study indicates that the population of C.japonica in the Palaeo-Oki Peninsula was larger than at other sites in western Japan. In the Wakasa Bay area, which is also regarded as a C.japonica refugia, the species increased abruptly in the early Holocene, and then spread throughout the Holocene (Yasuda, 1982 ; Takahara and Takeoka, 1992 ; Takahara et al., 1999). On the other hand, around Lake Shinji, which is located south of Oki Islands on the Sea of Japan coast near the middle of the Chugoku region, development of C.japonica during the early Holocene is not evident (Onishi, 1977), probably because southward migration of C.japonica from the Palaeo-Oki Peninsula into the present coastal area of the middle Chugoku region was prevented by a rapid rise in sea-levels in the late-glacialyptomeria japonica pollen percentages at 18000, 11000, 8000, 6000, 4000 and 2000 yr BP in western Japan were compiled on longitude-latitude and longitude-altitude diagrams. These diagrams shows migration and development for Cryptomrtia japonica from the last glacial maximum to the late Holocene.