Evaluation on Productivity of Plus-tree Open-pollinated Families from Natural Stands of Masson Pine

This paper deals with the genetic variation analysis and productivity evaluation on the plus-tree open-pollinated families in a series of progeny test plantations of masson pine located in Zhejiang Province.The significant variations were found among the open pollinated families for tree height, DBH and stem volume at age 5～10 which were under moderate or high genetic control.The observation results for ten years in succession showed that the heritabilities for three growth traits were stabler and their family genetic variation coefficiences decreased with age.Age age correlation analysis indicated that the tree height and stem volume at age 10 couldn′t be predicted by the tree height under age 5 ,and the first selection age for growth traits at family level would be above age 5.In the paper,tree height was considered as a main criterion of family productivity evaluation.Among 405 families tested,167,96 and 32 families,whose tree heights were more 10%,15% and 20% than the check respectively,were selected to provide the scientific basis for roguing in seed orchard and parent selecting in controlled pollination etc.