论文部分内容阅读
亮叶桦(Betula luminifera)、锥栗(Castanea henryi)是我国亚热带山地组成天然混交林的主要树种之一。具有树体高大,生长快,适应性强等特性,是阔叶树种中主要用材树种。由于林业生产进入到以针叶树为主,忽视了阔叶树种的发展,这些树种是优良的基因型,将有灭绝的危险。为了遵循森林群落多树种结构的自然规律和森林多效益的特点,保护和发展优良的阔叶树种,挖掘阔叶树种优良基因型是现代林业发
Betula luminifera and Castanea henryi are one of the main tree species in natural mixed forest in subtropical mountainous area in China. With tall trees, fast growth, strong adaptability and other characteristics, broadleaf tree species is the main timber. Since forestry production is dominated by conifers and ignores the development of broad-leaved species, these species are excellent genotypes and are at risk of extinction. In order to follow the natural law of multi-species structure of forests and the characteristics of multi-benefits of forests, the excellent genotypes of broad-leaved tree species for the protection and development of excellent broad-leaved tree species are modern forestry