1989 Fiscal Year Final Research Report Summary
A Gradient Analysis of Distributional Constructions of Woody Species in Forest Communities of Japan
| Project/Area Number |
62560151
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
林学
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| Research Institution | Kyoto University |
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Principal Investigator |
OOHATA Sei-ichi Kyoto University, Faculty of Agriculture, Instructor, 農学部, 講師 (50026639)
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| Project Period (FY) |
1987 – 1989
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| Keywords | Gradient analysis / Species number distribution / Japan Archipelago / Warmth index / Life forms of trees / Niche overlap / Fagaceae / Dendrogram |
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| Research Abstract |
In order to investigate the species construction of forest communities and interspecific relation along the forest zones throughout the Japan Archipelago,the author analyzed structures of the community relating to the temperature gradients, mainly by the Warmth Index (WI) using previously accumulated data. The distribution of species number against temperature gradient showed a humped shape, peaking at 85 WI, at the boundary zone of evergreen and deciduous broad-leafed forests.This evidence indicated the most likely influential factor to be the temperature ascent during the isolation of the archipelago after Ice Age. The species number distribution of two life forms rather continued from arctic to subtropical zone regardless of clear forest zonation by elevation. This overlap distribution of different life forms seemed to be the remained feature in the vegetation after the Tertiary, though differentiation of the forest zones was considered to advance after the Age.
The direct tests of niche overlap of habitat in 23 species of Fagaceae showed clearly co-existence in some pairs of species at the upper region of warm-temperate zone in contrast with usual interspecific relation. This niche overlap species distribution considered to occur with the temperature fluctuations after the Tertiary.
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