Soil organic layer thickness influences the establishment and growth of trembling aspen (Populus tremuloides) in boreal forests

摘要: Abstract In the North American boreal forest, presence of aspen (Populus tremuloides Michx.) is thought to be constrained on sites where thick (>25 cm) soil organic layers (SOL) prevail. Aspen can reproduce both by seeds and suckers, but it still unknown how SOL thickness influences modes reproduction. this study, we sought determine chemistry in black spruce dominated stands regeneration growth. abundance was negatively related logistic regression indicated that probability detect an declined from 30% at SOL = 0 cm 10% 30 cm. Our results also diameter breast height significantly correlated with abundance, positively Ntot, Ca, CEC pH. Finally, failed any significant effect mode (i.e. or suckers). study shows through changes physical chemical properties, accumulation equally hinders seedling germination growth, sucker development.