高知県低地部における晩氷期以降の植生変遷 (パリノロジー(特集))

概要

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The sediments obtained from Itachino and Noichi locating at the low land, east part of Kochi City, were studied pollenanalytically. As the result of the pollen analyses of these profiles, 4 periods were recognized in the following order from the bottom:1. Cool period (RI): The area of the Tsugion sieboldii Suzuki ('52) was extended. Its lower limit was lower about 1000m than it is now. This period was recognized at the bottom part of Itachino and the whole of the layers of Noichi.2. Transition period (RI-II): This period is characterized by an invasion of Cyclobalanopsis. RI-II is regarded as a transition zone between RI and the next RII. In temperature it seems to be more or less warmer than that of RI, but lower than to-day. Therefore these two periods may be referred to the Lateglacial period and the temperate ecotone zone in climate.3. Warm period (RII): The forest of the former period was pushed away by the warm temperate forest elements such as Cyclobalanopsis and Shiia which became dominant.4. Decreasing warmth period (RIII): The mutual replacement in dominance of the conifers and the ever-green broad-leaved forest was noticeable. This may be referred to the pluvial stage. After this, sudden increase of Pinus up to the surface is recognized. It is a common phenomenon through out Japan.
日本第四紀学会の論文