気候変動に対する植生の応答(I)

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Some isolation plant communities are considered as the relicts in the reduction under climatic changes, whereas the small population has a possibility to expand in the present limits. And the flora of Tohoku district is discussed as the coexistence with cold district plants and warm district plants. The warm district plants are grouped into two categories. One of them is originated in the former interglacial period and the other one is originated in the postglacial period. On the vegetation history, pollen analytical study revealed the movement of forest zones under the climatic changes. However, the some present trees did not compose many of remains of the conifer that piled up at the Last Glacial Maximum period (LGM). The present sub alpine and montane conifers might be minor elements in that time. When we get some correct information about the gene relationships, we will be able to estimate the speed of the movement of plant community by adding the pollen analytical data. In this study, we analyzed the sediments of the LGM period at Tochigi (Minami-nasu machi) and Miyagi(Sekai-yachi moor) prefecture to speculate the vegetation and also, compared the size of hemlock (Tsuga) pollen ratio with the outer and inner diameter to investigate the species. Those results are as following that, the main pollen taxa are Pinus (haploxylon type), Picea, Tsuga, Betula, Corylus and they are accompanied with Fagus crenata, Quercus and Tilia. Judging from the above pollen composition, both areas were covered by mixed forest consisted of conifer and deciduous broad-leaved trees at the LGM (ca. 18,000 years before). And the mixed forest included the both pollen types (Tsuga Sieboldii,T.diversifolia), but the former (T.S.) was lost in the late glacial period at both areas. And the vegetation indicated a tendency to increase grassland and coniferous trees within the forests in the north.
千葉経済大学の論文
2007-03-31

気候変動に対する植生の応答(I)

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