森林在社会发展乃至人类的生存中所起的巨大作用,日益受到人们的重视。它不仅能满足人们的多种生活需要,带来巨大的经济效益,而且在人类赖以生存的生态环境中起着不可取代的作用。因此,发展林业事业已被很多国家列为国策之一。为了合理利用森林资源并发挥森林的社会经济效益,学者们从生态学,地植物学,树木生理学、经济学和管理学等不同角度对 The great role played by the forest in social development and the survival of human beings has been paid more and more attention by people. It can not only meet the needs of people’s multiple lives, bring tremendous economic benefits, but also play an irreplaceable role in the ecological environment in which mankind depends. Therefore, the development of forestry has been listed as a national policy by many countries. In order to make rational use of forest resources and bring out the social and economic benefits of forests, scholars from different angles of ecology, geobotany, tree physiology, economics and management