白桦优良家系苗期的选择研究

Research on the choice of seeding age of Betula platyphylla Suk. choicenesses

通过对不同产地的白桦4年生幼树生长状况进行研究,选择出了4个优良家系,这为加速良种选育过程打下了基础。

In this paper,four choicenesses of stirps have been chosen by research on the growth status of Betula platyphylla Suk.four years old which are from different producing areas.They are J123,J155,S5 and S15.