Analysis on open-pollination progenies from clonal seed orchard of Pinus massoniana and combination ability selection

A half-sib progeny test was conducted on diameter at breast height(DBH),tree height and stem volume of 48 9-year-old families of Pinus massoniana from Duyun Masson Pine Clonal Seed Orchard.The results indicated there was great significant difference among families in tree height,DBH and volume,the heritability was high.9 families were selected,the average tree height,average DBH,average individual volume was 7.12 m,9.84 cm,0.037 97 m3,and the genetic gain was 10.44%,7.73% and 20.80% respectively.The 46 excellent individuals were selected from the 9 excellent families,the average height,average DBH and average individual volume increased 53.81%,56.65% and 150.18% respectively.The genetic gain of individual volume was 55.05%.They could be used as materials in building seed orchard of high cycle in Guizhou province.