马尾松自由授粉子代测定及优良家系选择

用1988年在南宁地区林业科学研究所初级种子园采到的马尾松（Pinus massoniana)自由授粉子代168个无性系的种子，作用田间单亲子代测定，11年观测结果表明，11年生时树高，胸径，材积分别有163，153，156个家系大于对照，分别占参试家系的97．0％，91．0％，92．9％，选择树高相对效应值＞1和胸径相对效应值＞1的优良家系，中选53个家系，中选率为31．5％，其家系子代可望在材积生长上获得30．64％的遗传增益，从遗传力，年龄间的相关程度以及早期选择的风险与效果考虑，家系选择可以在7－8年生时进行初选。

Open Pollination Progeny Test and Selection of Good Families in Pinus massoniana

The seeds collected from 168 clones of open pollination progenies of Pinus massoniana in the seed orchard ,Nanning Prefecture Institute of Forestry, were used for one parent progeny test in the field in 1988. In terms of 11 years' observation, there are 163,153 and 156 families which are better than control in tree height, breast height diameter and timber volume respectively, accounting for 970%,91 0% and 92 9% of the participated families respectively. Fifty seven families enter in a list of optimal families with relative efficiency greater than 1 in both tree height and breast height diameter, with 31 5% of selection rate. The progenies of these families may have 30 64% genetic gain in timber volume. The first selection of family may be conducted in 7 to 8 years considering heritability,ages correlation and, risk and effect of section in early stage.