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

研究了三种不同再生过程对林分内精细遗传结构的影响；(1)次生种子传播；(2)多群体重叠；(3)个体间完成。(1)松柏和水曲柳的二次传播均延长了种子的传播距离。其次，次生种子的传播会削弱遗传结构。(2)重叠队列削弱了一林分内的遗传结构。(3)白桦幼林兄弟间的竞争比非亲缘个体间的竞争更激烈。因此，自然再生的白杨等龄林分较强的遗传结构会在再生初期消失。

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.