| 要旨トップ | 目次 | 日本生態学会第58回全国大会 (2011年3月,札幌) 講演要旨


一般講演(口頭発表) C1-10

Effect of historical land use on spatial distribution of evergreen broadleaved tree species at their northern limit

*Luis Alberto Vega Isuhuaylas (Graduate School of Environment and Information Sciences, Yokohama National University), Fumito Koike (Graduate School of Environment and Information Sciences, Yokohama National University), Suzuki Makoto (Tokyo University Forest in Chiba)

Introduction: At their distribution limits, plant species subsist under climatic stress and are considered as regionally endangered. Also, land use change increases the environmental stress and influences modern vegetation composition. Such effect could affect marginal plant populations more significantly and cause their reduction.

Methodology: Current distribution of 20 evergreen broadleaved species (5 at their northern limit) was studied at the Tokyo University Forest (2171 ha). Presence and absence was surveyed in 7112 plots of 10m by 10m. Current distribution was modeled by multivariate logistic regression with factors derived from a 10m DEM mesh (slope, solar radiation, surface curvature), a 1 km mesh climatic data, and land use maps: current (2005) and historical (1900).

Results: For northern limit species the historic land use was always a more important explanatory factor than current land use; surface curvature, precipitation and winter minimum temperature were also important factors.

Conclusion: For northern limit species, the historical land use has greater influence over their population distribution.


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