铅笔柏选优标准的研究*

铅笔柏(Sabina virginiana A.)树型优美,材质优良,根系发达,枝叶繁茂,适应性广,抗逆性强。原产北美,本世纪初引入我国。北起辽南、北京,南到浙江舟山、江西庐山均有栽培(江苏、山东、安徽已造林),生长良好。为了进一步选拔作为用材林、防护林的优良母树.于1987年开始进行了铅笔柏的选优工作。

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.