Root growth potential, seedling morphology and bud dormancy correlate with survival of loblolly pine seedlings planted in December in Alabama.
Root growth potential, seedling morphology and bud dormancy correlate with survival of loblolly pine seedlings planted in December in Alabama.
复制标题
根系生长潜力、幼苗形态和芽休眠与 12 月在阿拉巴马州种植的火炬松幼苗的存活率相关。
作者：
H. S. Larsen;D. South;J. Boyer
从20个苗圃取样的12月种植的火炬松幼苗的第一年存活率在36%到86%之间。苗木的根生长势(RGP)、冠根比、根重和茎长等性状与成活率相关。用新根数和冠根比建立的回归模型可解释第一年存活率变异的80%。单单是新生根数>；/=0.5 cm就能解释成活变异的76%。叶面营养与成活无关。在种植时，静态芽比例高的幼苗比休眠(内气味)芽的幼苗具有更高的RGP和更好的成活率。这些数据表明，休眠芽的幼苗不应该种植在需要快速新根生长才能生存的地点。
First-year survival of December-planted loblolly pine seedlings sampled from 20 nurseries ranged from 36 to 86%. Various characteristics of the seedlings including root growth potential (RGP), shoot/root ratio, root weight and stem length were correlated with survival. A regression model using the number of new roots >/= 0.5 cm and the shoot/root ratio accounted for 80% of the variation in first-year survival. Alone, the number of new roots >/= 0.5 cm accounted for 76% of the variation in survival. Foliar nutrients were not correlated with survival. Seedlings with a high proportion of quiescent buds at planting had a higher RGP and better survival than seedlings with dormant (endodormant) buds. The data suggest that seedlings with dormant buds should not be planted on sites where rapid new root growth is needed for survival.