海底堆積物の花粉分析学的研究 -2. 東京湾(東京都)-

概要

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A core 443 cm long containing clay deposits was sampled from marine sedments at 14 m depth by a marine research ship (Bousei-maru) owned by Tokai University in Tokyo Bay (coordinates N 35°34'42", E135°47'50") in the Kanto district, eastern Japan. Pollen and spore analyses showed four local pollen assemblage zones (TO) coordinating one Japanese regional pollen zone (R) of the postglacial period. HI-4 Cyclobalanopsis, Betula, Fagus stages (443-320cm in depth, R-IIIa zone) HI-3 Cyclobalanopsis, Castanopsis stages (320-200cm in depth, R-IIIa zone) HI-2 Cyclobalanopsis, Castanopsis, Carpinus, Betula, Fagus stages (200-80cm in depth, R-IIIa zone) HI-1 Pinus, Cryptomeria, Cyclobalanopsis stages (80-0cm in depth, R-IIIb zone) Compared with the results of pollen analyses from the Kanto district shows that the present core contains a vegetational history spanning approximately 4,000 years before present. Although the sediments are marine, the pollen diadram has terrestorial characters. Caused by the fact that the boring point was located near the coast, Tokyo Bay is a closed bay having only the Uraga Channel and the ocean current is weak. Fossil pollen morphology of subgenus Cyclobalanopsis by scanning electron microscopy identified three species : Quercus sessilifolia, Q.glauca and Q.salicina.
岡山理科大学の論文