Regeneration dynamics and meintenance mechanism of forest community

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1)Gap-regeneration dynamics of different forest types of Japan was investigated and gap-disturbance regime of these forest types was clarified.Also, gap-regeneration behavior of major tree species in these forest types was clarified and evaluated.2)Forest community dynamics were studied in a 6 ha permanent plot of a species rich, old-growth, temperate deciduous forest in Ogawa Forest Reserve, central Japan.The turnover time of population is positively correlated with the maximum dbh size of the species, indicating the slow change of the population of large sized species.3)The wave regeneration of forest trees is studied theoretically in model populations with a lattice structure.Two-dimensional models tend to produce more regular wave regenerating patterns than one-dimensional models.4)The effects of Sika deer(Cervus nippon)browsing on the regeneration of pioneer species were studied in relation to canopy gaps in a warm temperate evergreen oak fofest in Kasurayama, Nara City.Successful regeneration of a pioneer, Zanthoxylum ailanthoides, occurred for several years even after two major wind disturbances during the past 90 years.This may be due to less browsing pressure from the deer.5)Spatial distribution of natural regenerating trees were measured in a Pinus thunbergii plantation on Mt.Tanakami, Japan.The distribution of saplings and seedlings of barochores, anemochores, and coppicing species was especially clustered near their mother trees.