ABSTRACT The effect of site preparation (mixed mounding and removal of the humus layer) under a shelterwood of mixed boreal forest along a forest interior-edge gradient on Norway spruce (Picea abies) seedlings was studied two years after planting. Mounds had a positive effect on root development, ectomycorrhiza formation and the absorption of nitrogen (N) and phosphorus (P) in the seedlings, and augmented their survival, growth and biomass. Humus removal had an adverse effect on the root biomass and ectomycorrhiza formation. A decreased soil fertility after the removal of humus led to a low N and P content in the seedlings. Two years after planting, humus removal had not affected the growth of the seedlings, but reduced their biomass. The influence of the forest edge, compared to the interior plot, was mostly associated with a decrease in the stand density, reduced amount of litter and increased light availability for the seedlings.

中文翻译：

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防护林下整地对挪威云杉幼苗的影响

摘要 在种植两年后，研究了沿着森林内缘梯度在混合北方森林的防护林下整地（混合堆垛和去除腐殖质层）对挪威云杉（Picea abies）幼苗的影响。土墩对根系发育、外生菌根形成以及幼苗对氮 (N) 和磷 (P) 的吸收具有积极影响，并增加了幼苗的存活、生长和生物量。去除腐殖质对根生物量和外生菌根形成有不利影响。去除腐殖质后土壤肥力下降导致幼苗中的 N 和 P 含量低。种植两年后，去除腐殖质并未影响幼苗的生长，但降低了它们的生物量。与内部地块相比，森林边缘的影响，