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在林木选择育种工作中,早期选择及其适宜年龄的确定,对提高早期选择的成功率,加速选择的进程,缩短育种周期意义很大,因而受到人们的关注,林学家从不同角度对此课题进行探讨。如陈铁英等从研究林木在林分中的生长过程和分化规律入手,确定了樟子松的早期选择年龄;孔祥阳等在对人工林内各单株的生长和分化进程分析的基础上,认为在油松人工林中9—12龄前可以淘汰劣株,选优宜在15龄后进行。本文应用华北落叶松人工林中的单株林木调查资料,对其生长过程和林分中林木的分化状况等进行分析,提出华北落叶松早期选择年龄的研究结果,为该树种进行早期选
In the forest selection and breeding work, the early selection and determination of appropriate age, to improve the success rate of early selection, to speed up the selection process, shorten the breeding cycle is of great significance, and therefore subject to the people’s attention, forest scientists from different angles on this topic To explore. For example, Chen Tieying started the study on the growth process and differentiation of forest trees in the stands, and determined the early selection age of Pinus sylvestris. Based on the analysis of the growth and differentiation of individual plants in the plantation, Kong Xiangyang et al. Pine plantation in 9-12 years old before they can eliminate bad, choose excellent after 15 years of age. In this paper, single Larix principis-rupprechtii plantation forest survey data to analyze its growth process and the differentiation of the forest stand in the analysis of the early selection age of Larix principis-rupprechtii results for the species early selection