【摘要】 本文用统计分析方法研究了不同苗龄和不同等级的水曲柳、黄波罗和胡桃楸苗木造林后近几年的生长特点。结果表明,在相同的抚育措施和相同的立地上,Ⅰ级苗木造林后,其高生长、地经生长、生长状态、造林成活率和保存率较好,而Ⅱ级苗相对较差。在这三个硬阔叶树种当中,水曲柳生长比黄波罗和胡桃楸迅速,是速生树种。在造林时选择优质苗木对幼林生长是非常重要的。更多还原

【Abstract】 This paper, by the methods of statistics, studied the early growth of manchurian ash, amur eorktree and manchurian walnut in different seedling ages and classes after regeneration. The results show that the height and root growth, survival and conservative rate in the same site, Ⅰ class seedlings are better than Ⅱ class ones. In the three kinds of species, height growth of ash is the fastest after planting four year. Therefore, it is important to select high quality seedlings for young stands growth.更多还原