STUDY ON SELECTION OF PLUS TREE OF PENCIL CEDAR

Started with the study of the interrelation and took range of variation as basis between individual tree growth and phenotype variation of Pencil Cedar (Which is introduced from America) through examining 27 planting plaies (nearly 100 thousands trees in 30 stands) and investigating key beds, which are different in site and age, in the areas of Jiangsu, Anhui, Shandong and Beijing. A set of standard of phenotype test was summarized, and the standard for selection of plus tree by mean of the comprehensive appraisal method was instituted for this species. Furthermore, 10 plus trees of Pencil Cedar, whose score excesses 80 by using the standard, are re-selected as candidates trees from the 18 pre-selected plus trees in China. Those plus trees can be used to establish nursery for scion or as material for test plantation.