Keywords: 
• Larix olgensis /
• seedling quality /
• seedling age types /
• seedling grade /
• afforestation

Abstract: According to the classification standards of height and diameter， seedlings (1-0) of Larix olgensis were divided into two grades:Ⅰand Ⅱ， and transplanted seedlings (11) were divided into three grades: super， Ⅰand Ⅱ. Experiments were conducted on root growth potential and outplanting performance based on seedling ages and grades. The results showed that: 1) the amount of new roots longer than 1 cm (TNR1) was significantly different among seedling ages and grades. TNR1 was a better indicator for root growth capacity of L. olgensis seedling in various ages and grades. 2) Seedlings had greater height and wider diameter growth than transplanted seedlings in the first year of outplanting. Super transplanted seedlings had the smallest growth in height and diameter among treatments. The order of outplanting survival rate， from big to small， was gradeⅠseedlings and transplanted seedlings gradeⅡtransplanted seedlings gradeⅡseedlings and super transplanted seedlings. The results of the multiple regression analysis showed that there was a strong correlation between morphological indicators and TNR1 as well as outplanting growth. Morphological indicators can be used to predict the growth of L. olgensis seedling after outplanting. From the aspects of outplanting survival rate， seedling growth， cultivation duration and cost， the best seedling used for afforestation is grade Ⅰ transplanted seedlings， then the second choice is grade Ⅰ seedlings and grade Ⅱ transplanted seedlings. 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