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Study on criterion for plus trees of Eucalyptus dunnii

CHEN Jian-zhong(Forestry Bureau of Jianyang,Jianyang 354200,China)  
Base on the investigation of Eucalyptus dunnii Maiden in 7 country cultivated areas in Jianyang,42 plus trees and 420 dominant trees were collected.According to the statistic and analysis,the criterion for choosing E.dunnii was got.That was the plus trees should be more than 50%,46%,229% of the average dominant trees in tree height,diameter breast height(DBH) and timber separately or be more than 47%,47%,227% of mean sampletree in height,DBH and timber,separately.This criterion was the same with the choosing for E.dunnii plus tree in Jianyang as timber stand.
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