Analysis of species and genetic diversities' dynamics in natural forest management.

认为可持续的木材产品是通过广泛的选择采伐，这是在北海道的大学森林，大学森林，东京大学农学系进行的天然林可持续管理制度。然而，对进行这种管理的天然林的物种多样性和遗传多样性的变化研究很少。在此基础上，对广选采伐利用天然林存在的问题进行了梳理，并从物种多样性的角度进行了探讨。以冷杉林木为实例，对择伐的遗传效应进行了探讨。并揭示了北海道大学林冷杉林的实际遗传多样性。研究结果如下：1)天然林择伐改变了森林结构，尤其是林木直径。当时似乎有必要砍伐阔叶树种，以保持森林的物种多样性。2)选择采伐降低了冷杉天然林中同质性等位基因组合的比例，增加了异质性等位基因组合的比例。然而，人群中的等位基因频率并没有显着变化。3)分布在不同海拔地区的冷杉种群间存在遗传分化。在北海道的大学森林里的太陆山。

It is thought that sustainable wood product is secured by the extensive selection cutting which is a sustainable management system of natural forest conducted in University Forest in Hokkaido, The University Forests, Faculty of Agriculture, The University of Tokyo. However there is little research on the changes in species diversity and genetic diversity of the natural forest where this management was conducted. Then we put the problems in the utilization of natural forest by the extensive selection cutting in order and discussed on them from the viewpoint of species diversity. We discussed on the genetic effect of selection cutting of Abies sachalinensis forest as an practical sample. And we also revealed the actual genetic diversity of Abies sachalinensis forests in the University Forest in Hokkaido.Following results were obtained by this research ; 1) Forest structure, especially in diameter of trees, had been changing by the selection cutting in the natural forest. Then it seemed to be necessary to cut broad-leaved species to maintain the species diversity of the forest. 2) Percentage of homogeneous allele combinations was decreased and heterogeneous allele combinations were increase in the natural stand of Abies sachalinensis by the selection cutting. However there was not significant change in allele frequencies in the population. 3) Genetic differentiation was detected among Abies sachalinensis populations distributed a different altitude on Mt. Tairoku-san in University Forest in Hokkaido.