Study on spatiotemporal changes of fine genetic structure along with regeneration processes of tree species.

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We studied on effects of three different processes of tree regeneration on fine genetic structure within stand ;(1) secondary seed dispersal,(2) overlapping of multi cohorts and(3) completion among individuals.(1) Distance of seed dispersal was prolonged by the secondary dispersal both in Quercus crispula and Fraxinus mandshurica. Then the genetic structure supposed to be weakened by the secondary seed dispersal.(2) Overlapped cohorts weakened the genetic structure within a stand of Stewartia monadelpha.(3) The competition among individuals was severer among siblings than among nonrelated individuals in a young plantation of Betula maximowicziana. Therefore, the strong genetic structure of naturally regenerated even-aged stand of B. maximowiczana will disappears in the early stage of its regeneration.