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在智利温带雨林中,萌发条件与幼苗耐荫性并无关联。

Germination requirements and seedling shade tolerance are not correlated in a Chilean temperate rain forest.

作者信息

Figueroa Javier A, Lusk Christopher H

机构信息

Departamento de Ecología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Casilla 114-D, Santiago, Chile.

Departamento de Botánica, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Casilla 160-C, Concepción, Chile.

出版信息

New Phytol. 2001 Dec;152(3):483-489. doi: 10.1046/j.0028-646X.2001.00282.x.

Abstract

•  In a comparative study of 26 Chilean temperate woody species, the following questions were addressed. Are germination requirements correlated with seedling light requirements? Can germination requirements be used to delimit pioneer and nonpioneer guilds? •  To assess dependence of germination on canopy gaps, germination percentages were compared experimentally in gap and understorey environments. Seedling light requirements were quantified by determining the mean light environment naturally occupied by juveniles of each species. •  Germination was significantly higher in the gap than in the understorey in > 30% of the species, although only one germinated exclusively in the gap. In the understorey, germination was higher in 19% of species, whereas 50% were indifferent to germination environment. Several light-demanding species germinated abundantly in the understorey. Both cross-species analysis and phylogenetically independent contrasts showed that seedling light requirements were not correlated with responsiveness of germination to the gap environment. •  Results suggest that germination requirements and seedling light requirements are not coupled, and that requirement of canopy gaps for germination cannot be used to delimit pioneer and nonpioneer guilds in a Chilean temperate rain forest.

摘要

• 在一项对26种智利温带木本植物的比较研究中,探讨了以下问题。种子萌发需求与幼苗光照需求相关吗?种子萌发需求能否用于划分先锋植物类群和非先锋植物类群?

• 为了评估种子萌发对林冠空隙的依赖性,通过实验比较了林冠空隙和林下环境中的种子萌发率。通过测定每个物种幼苗自然占据的平均光照环境来量化幼苗的光照需求。

• 超过30%的物种在林冠空隙中的种子萌发率显著高于林下,尽管只有一种仅在林冠空隙中萌发。在林下,19%的物种种子萌发率较高,而50%的物种对萌发环境不敏感。一些需光物种在林下大量萌发。跨物种分析和系统发育独立对比均表明,幼苗光照需求与种子萌发对林冠空隙环境的响应不相关。

• 结果表明,种子萌发需求和幼苗光照需求并不相关,并且在智利温带雨林中,种子萌发对林冠空隙的需求不能用于划分先锋植物类群和非先锋植物类群。

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