岩手県低地帯湿原の花粉分析的研究 : (II)春子谷地湿原
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概要
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A moor called Harukoyachi is situated at an altitude of about 460m above sea level at the southeastern foot of Mt. Iwate, in the central part of Iwate Prefecture. Although this station is in the cool temperate forest zone, the secondary woods dominated mainly by Pinus densiflora, Quorcus serrata and Q. dentata etc. are developed around the moor at present. The sediments obtained from the moor were studied pollen-analytically. From the results of pollen analysis, six stages were recognized in the pollen diagram from the bottom to the surface. (1) Betula-Quercus stage (580-480 cm) (2) Quercus-Betula-Fagus stage (480-420cm) (3) Quercus-Fagus stage (420-240 cm) (4) Quercus stage (240-110cm) (5) Fagus-Cryptomeria stage (110-40 cm) (6) Pinus stage (40-0 cm) The first stage is characterized by the dominance of Betula ermanii, Quercus sp. (probably Q, mongolica var. undulatifolia) and Haploxylon Pinus. This stage, therefore, may correspond to the end of the Pleistocene or the beginning of the Holocene. The second stage is considered to be the transitional period from the sub-arctic forest stage to the cool temperate one. The third and the fourth stages are dominated by the cool temperate forest elements such as Fagus crenata, Quercus mongolica var. grosseserrata and Alnus sp. (probably A. japonica). It may be possible that the climate during the third and the fourth stages was milder and moister than the other stages. In the fifth zone, the cool temperate elements tend to decrease and Cryptomeria japonica becomes dominant for a while. The climate in this zone is somewhat cooler than that of the previous two stages. The destructions of natural forests by human activities and the following developments of secondary ones are reflected in the pollen diagrams of the sixth stage. The vegetational history mentioned above can be regarded as typical for the period from the Late glacial age to the present time in the lowlands of Northeastern Japan.
- 日本生態学会の論文
- 1972-08-20