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首页> 外文期刊>Tree Physiology >Ontogenetic variation in the relative influence of light and belowground resources on European beech seedling growth.
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Ontogenetic variation in the relative influence of light and belowground resources on European beech seedling growth.

机译：光照和地下资源对欧洲山毛榉幼苗生长的相对影响的个体发育变异。

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摘要

We used height growth data from a 7-year field experiment with European beech (Fagus sylvatica L.) seedlings to test the hypothesis that the effects of above- and belowground resources on height growth depend on seedling size and age. Photosynthetically active radiation (PAR) was determined by hemispheric photography, and estimates of fine root biomass of the overstory trees were used as an inverse proportional surrogate for belowground resource availability. For recently germinated seedlings growing under the canopy of Picea abies (L.) Karst., belowground resource availability affected height growth more than light. During subsequent stages of seedling development, apart from initial seedling size, PAR increasingly determined seedling growth. Besides initial size, seedling age determined the effects of above- and belowground resources on seedling height growth. In seedlings identical in initial size but differing in age, the increase in height growth with increasing PAR was greater in older seedlings than in younger seedlings. The ranking of seedling height by year showed that small differences in size at the end of the first growing season resulted in continuously increasing differences during the following years. Mortality data indicated that the chances of a seedling surviving intraspecific competition was strongly determined by its dominance ranking within the first 5 years after establishment.
机译：我们使用来自欧洲山毛榉（Fagus sylvatica L.）幼苗的7年田间试验的身高生长数据来检验以下假设：地上和地下资源对身高生长的影响取决于幼苗的大小和年龄。通过半球摄影确定光合有效辐射（PAR），并将树上乔木细根生物量的估计值用作地下资源可用性的反比例替代指标。对于在云杉（Pice abies（L.）Karst。）冠层下生长的最近发芽的幼苗，地下资源的可获得性对高度生长的影响大于对光的影响。在幼苗发育的后续阶段，除了最初的幼苗大小，PAR越来越多地决定了幼苗的生长。除了初始大小，幼苗年龄还决定了地上和地下资源对幼苗高度生长的影响。在初始大小相同但年龄不同的幼苗中，随着PAR的增加，高度增长的增加大于年轻幼苗。按年对幼苗高度的排名显示，在第一个生长季节结束时，大小差异很小，导致随后几年间差异不断增加。死亡率数据表明，幼苗在种内竞争中存活的几率很大程度上取决于其在建立后的前5年内的优势地位。

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