Using gene grouping means to evaluate the fast-growth and stability of loblolly pine families, No. 19, 25, 18, 21 and 10 families had superior gene type, which grew fast and varied little.

• 运用基因型分组法对火炬松家系的速生性和稳定性进行综合评价，最终确定19、25、18、21、10号家系为增产且变异小，具有理想基因型的稳定型家系。