Half-sib Progeny Test and Excellent Family Selection of the 3rd Generation Seed Orchard for Cunninghamia lanceolata

Based on the 20 open-pollinated families in the third-generation seed orchard of Cunninghamia lanceolata from the forest farm of Fujian province,the growth traits of 2-year-old half-sib progeny were investigated and analyzed in Hongya forest farm of Sichuan province.The results indicated that the average seedling height and variation coefficient were 14.72 cm and 20.30%,respectively; the average ground diameter and variation coefficient were 3.11 mm and 20.91%,respectively.And there existed significant differences in seedling height and ground diameter among different families.The family heritability of seedling height,ground diameter was 0.886 and 0.874,indicating the great family heritability for growth traits.4 excellent families were selected on the basis of comprehensive assessment.The average tree height was 16.81 cm,the genetic gain 11.00%,and the average ground diameter was 3.47 cm,the average genetic gain was 9.05%.The selected excellent families could be reserved for further test and assessment.