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一、良种选育杉木母树林建立的原则和方法………………………··,…………………·,………………·(4,-5 if份 1页)杉木优t/j的选择iii}i…………………………………………………………,…。……………··(4～5厂价 5贝 )杉木种子园建立的原则和方法………………………………
I. Principles and Methods of Seed Selection and Breeding of Fir Tree for Forests ............................................................................................................... ) Choice of fir excellent t / j iii} i .................................................................., .... ............... ·· (4 ~ 5 priced at 5 shellfish) fir seed orchard established principles and methods ....................................