以材积生长量和树干通直圆满度作为选择优树的主要性状指标,从广西百色市西南桦(Betula alnoides)天然林分中选出优质林分3片,候选优树153株,选定采种优树9株.从选定的优树上采种、育苗、造林.造林后的6年生子代林的平均树高12.8m,平均胸径14.0cm.子代林木继承了母本的优良性状.%The volume and straightness of stem were used as the main indexes for selection ofsuperior trees of Betula alnoides. Three pieces of superior stands and 153 candidate trees wereselected from the natural forests in Baise, Guangxi and 9 superior trees were selected for theseed collection. The measurements showed that the 6-year old progeny trees had average heightof 12. 8 m and average diameter of 14. 0 cm, which still keep the superior properties of mothertrees.
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