Regeneration biomass (AGB & BGB), age, NSCs and light: F. sylvatica and Acer spp.

Being able to persist in deep shade is an important characteristic of juvenile trees often leading to a strong dominance of shade-tolerant species in forests with low canopy turnover and disturbance rate. While leaf, growth and storage traits are known to be key components of shade tolerance, their interplay during regeneration development and influence on juveniles’ survival time remains unclear. We assessed the ontogenetic effects of these three traits on survival time of beech  (Fagus sylvatica), Norway and sycamore maples (Acer pseudoplatanus, Acer platanoides) in a primeval beech forest. Biomass allocation, age and content of non-structural carbohydrates (NSC) were measured in stems and roots of 289 seedlings and saplings in high and low vitality classes. Saplings experience a trade-off between absolute growth rate (AGR), and storage (NSC) at decreasing leaf area ratio (LAR) with biomass development. High LAR but slow AGR and low NSC confer beech with a marked ability to persist in...

幼树具备在浓荫下存活的能力是其重要特性，这通常导致耐阴物种在冠层周转率低、干扰率小的森林中占据主导地位。尽管叶片、生长和贮藏性状被认为是耐阴能力的核心组成部分，但它们在更新发育过程中的相互作用及其对幼树存活时间的影响仍不明确。我们在原始山毛榉林中评估了这三种性状对欧洲山毛榉（Fagus sylvatica）、挪威槭和欧亚槭（Acer pseudoplatanus, Acer platanoides）幼树存活时间的个体发育效应。我们测量了289株处于高、低活力等级的幼苗和幼树茎干与根系的生物量分配、年龄及非结构性碳水化合物（NSC）含量。随着生物量的增加，幼树叶面积比（LAR）降低，此时其绝对生长速率（AGR）与贮藏量（NSC）之间存在权衡关系。高叶面积比（LAR）、低绝对生长速率（AGR）和低NSC含量赋予欧洲山毛榉显著的存活能力……