Plus Tree Selection of the Second-generation Chinese Fir Seed Orchard in Yuejiang

Chinese fir is one of important timber species in Sichuan province.To explore and utilize the plus tree and good genetic type of the Chinese fir seed orchard is an inexorable demand.The Yuejiang second generation seed orchard of Chinese fir was taken as the selection target in this study.By use of the Standare Block method,84 genotypes were choosen.the plus tree groups were made up of 197 maternal plants,their diameter at breast height were in the range of 25 cm~40.7 cm,their average diameter was 29.7 cm.These plus tree could provide material for building a new generation seed orchard and clonal propagation due to the wide sources with abundant genetic base.