Fine families selecting in half-sib progeny of plus-tree of Pinus kesiya var.langbianensis

To select elite families from the test forests of plus-tree half-sib progenies of Pinus kesiya var.langbianensis,the correlation and factors of every character of each family were analyzed,then timber volume and straight index were adopted as key factors to assess the growth quality of P.kesiya var.langbianensis;taking timber volume and straight index as research objects,'t' test of timber volume and straight index of every family were performed,the result showed: in the first group,timber volume of 93.2% of the families were better than the control,straight index of 72.7% of the families were better than the control,and 10 families were selected as elite ones in the first group;in the second group,timber volume of 97.9% of the families were better than the control,straight index of 95.7% of the families were better than the control,and 12 families were selected as elite families in the second group,among of which the biggest volume was 80.3% higher than that of the control,and the highest straight index was 51.6% higher than that of the control.