长白落叶松苗木质量与造林效果关系的比较
Relationship between seedling quality and outplanting performance of Larix olgensis.
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摘要: 以苗高和地径为分级标准,将长白落叶松播种苗(1-0)分成2级:Ⅰ级苗和Ⅱ级苗,将移植苗(1-1)分成3级:特级苗、Ⅰ级苗和Ⅱ级苗,以苗龄和等级为试验因子进行了根生长潜力和造林效果试验。结果表明:①1 cm新根数量(TNR1)在苗龄之间和等级之间差异均显著,说明TNR1能代表不同苗龄和等级长白落叶松苗木的发根能力,可作为评价苗木质量的活力指标。②播种苗苗高和地径生长量均大于移植苗,所有处理中移植苗特级苗的生长量和生长率最低。造林成活率依次为:移植苗和播种苗的Ⅰ级苗移植苗Ⅱ级苗播种苗Ⅱ级苗和移植苗特级苗。通过逐步多元回归分析,得出苗木形态指标与根生长潜力及生长量之间存在很强的相关性,可以用形态指标预测长白落叶松苗木的活力状况和造林后的生长表现。从造林成活率和生长量两个方面来看,再考虑到培育周期和育苗成本,造林效果最好的是移植苗Ⅰ级苗,其次是播种苗Ⅰ级苗和移植苗Ⅱ级苗。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 (11) 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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Key words:
- Larix olgensis /
- seedling quality /
- seedling age types /
- seedling grade /
- afforestation
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