Synopsis : The influence of deer on forest vegetation change in the Tanzawa Mountains of Western Kanagawa Prefecture was clarified , Relev 合s in eastern Tanzawa Mountains representing three associations ( Corno −Fagetum crenatae MIYAwAKt , OHBA 2'MuRAsE 1964, ル∬ ' r ' c α c α -' o − Fagetum crenatae M [ YAwAKI , O } ・ IBA e 亡MuRAsE 1964, and Chrysosptenieto −Fraxinetum spae 'hianae MIYAwAKI , OHBA e 亡 MuRAsE 1964)in years 1964, 1997, 2007 were compared . The original dominant species of each

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... est nearly disappeared by / 997. The species were illcreasingly replaced by perelmials and shrub species that are not preferred by deeL A marked increase in annual plants was associated with soil disturbance in 2007, and ill one associatiorl , Sas α , which is tolerant of deer , irlcreased . The di 丘erences iD species cornposition and 1ife form composition among the three associations decreased as a result of the invasion of non − forest species imo the forest . A " forest protection fence " that prevents deer from enteril ユ g the forest has enabled the recovcry of thc forest floor vegetation . However , it was estimated that ten or more years were required for the species composition to recover to the condition of an original forest . Key words : plagiosere , Fagus forests , deer, Tanzawa Mountains , phytosocio1Qgy は じ め に