浜名湖周辺の完新世植生史〔英文〕

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Holocene vegetation around Lake Hamana was reconstructed from fossil pollen assemblages in three boring core sediments obtained from the bottom of the lake (the deepest point of the main lake and its satellite, Lake Shonai) and the lakeshore (near the Town of Yuto-cho).Three forest stages were recognized at each site, namely, warm-temperate broadleaved deciduous forest, lucidophyllous forest, and Pinus forest stages.The development pattern of the lucidophyllous forest in the northern area was different from that in the southern area. In the northern area, which includes the catchment of the Miyakoda River, the major supply source for the main lake, lucidophyllous forest composed of Castanopsis and Quercus (Cyclobalanopsis) developed, and flourished from about 5, 000y.B.P. On the other hand, in the southern area around the Town of Yuto-cho and Lake Shonai, Castanopsis forest formed about 7, 500y.B.P. and Quercus (Cyclobalanopsis) began to expand from about 6, 000y.B.P.These facts indicate that the southern area of Lake Hamana facing the Pacific Ocean must have been influenced by the ocean, especially the warm Kuroshio current, during the Holocene.
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