銚子半島高神低地の後氷期における植生変遷史

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  • HOLOCENE VEGETATION HISTORY OF THE TAKAGAMI LOWLAND ON CHOSHI PENINSULA, CENTRAL JAPAN
  • チョウシ ハントウ タカガミ テイチ ノ コウヒョウキ ニ オケル ショクセ

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A palynological study was made on the Holocene sediments of the Takagami lowland in Choshi Peninsula, Japan. The pollen diagram could be divided into four local fossil pollen assemblage zones : the CTG-I zone was characterized by Castanea, Quercus (Lepidobalanus) and Acer at high frequencies, CTG-II by Abies and Tsuga, CTG-III by Castanopsis and Quercus (Cyclobalanopsis), and CTG-IV by Pinus. The stratigraphical sequence of pollen in the core sediments showed that warm-temperate broad-leved deciduous forest had changed to warm-temperate coniferous forest at the early Johmon transgression, and was followed by lucidophyllous forest 5500 years ago after the hypsithermal age, and subsequently by pine forest 4500 years ago. A similar succession pattern of lucidophyllous forest was observed in the Kanto plains, but was not evident at several areas along the Pacific coast where Castanopsis forests were formed at the early Holocene (7500-8500 y.B.P.). These findings clearly show that the vegetation of the Takagami lowland was not influenced by the warm Kuroshio current during the Holocene.

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