马尾松全同胞子代测定及优良单株选择

通过对5年生马尾松全同胞及半同胞子代林的生长性状调查研究,分析不同家系间的家系方差分析、家系遗传力的变化,估算其遗传增益和选择效率,从48个全同胞中共筛选出12个优良家系,其平均树高、胸径、单株材积的遗传增益分别为3.1%、8.0%、18.6%;采用联合选择及逆向选择的方法,在母本配合力较高的优良家系中选择出40个优良单株,其平均树高5.2m,平均胸径9.0cm,平均单株材积0.01813m3,现实增益分别达18.1%、42.4%、117.5%。通过联合选择可获得双层次的遗传增益,实现提高用材林产量的目标。

Study on ful-sib progeny test and selection of plus trees in Pinus massoniana

Based on the investigation of the growth status of 5-year-old ful-sib and half-sib progenies, the genetic variances and the heritabilities of different families were analysed and the genetic gain and selection efficiency were estimated. Twelve excellent families were selected from the 48 families, their genetic gain of average tree height, average DBH and average individual volume was 3.1%, 8.0% and 18.6%, respectively. Forty plus trees were further selected from the excellent families of high combining ability of female parents by the manner of union selection and backward selection, with average tree height 5.2 m, average DBH 9.0 cm and average individual volume 0.0181 m3, and their genetic gain was 18.1%, 42.4% and 117.5%, respectively. Double genetic gain would be obtained by the method of union selection,this could improve the yield of P.massoniana timber platation.