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对１１２个杉木优良家系的主要生长性状，采用主成分遗传距离法进行综合评价，从中选出４０个高产优良家系，平均材积遗传增益达７１．５％，能显著提高增益水平。
The main growth traits of 112 Chinese fir elite families were evaluated by using the principal component genetic distance method. Forty elite high-yielding elite families were selected. The average genetic gain of the callus reached 71.5%, which could significantly increase the gain.