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首页> 外文期刊>Acta oecologica >Forest herb layer response to long-term light deficit along a forest developmental series
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Forest herb layer response to long-term light deficit along a forest developmental series

机译：森林草本层对森林发育系列中长期光亏的反应

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摘要

Temperate deciduous forest communities are slow-changing systems, with herbaceous understorey communities displaying a delayed response to overstorey canopy and light dynamics. While light availability constrains herbaceous understorey diversity and composition in space and time, its response in the long-term absence of light has seldom been quantified, particularly as it is often confounded bycovariation in soil conditions. We studied a developmental high-forest series in two widespread NW-European temperate deciduous forest communities with different dominant canopy tree species: Stellario-Carpinetum (Oak-hornbeam canopy) and Milio-Fagetum (Beech canopy). All plots had soil conditions which were not significantly different, enabling investigation into the direct effects of the long-term absence of light on the herbaceous understorey, disentangled from the confounding effects of soil variation.Plant species richness measures declined with canopy cover continuity in the herb layer of the oak-hornbeam stands, whereas richness in the herb layer of the beech stands displayed a unimodal response. Nonetheless, in both plant communities, species richness and closed-forest species richness were negatively affected by the extended absence of light in stands with the longest period of continuous canopy cover. The long-term limitation or decline in quantitative and qualitative light availability as a result of extended periods of canopy cover was shown to be the primary driver behind losses in alpha-diversity, community composition turn-over and individual species dynamics. Heliophilous species were lost from both communities, while closed-forest species also declined, as a direct consequence of the prolonged period without ample light on the forest floor. This study demonstrates how the herb layer is affected by the absence of light on the forest floor mediated by long periods of continuous canopy cover. Despite different temporal responses in herb layer richness and composition between different shade-casting canopy species, the eventual outcome in the prolonged absence of light is independent of dominant canopy species.
机译：温带的落叶林群落是变化缓慢的系统，草本的下层群落对高层的冠层和光动力显示出延迟的响应。尽管光的可用性在空间和时间上限制了草本植物的下层多样性和组成，但很少量化其在长期缺乏光照下的响应，特别是由于土壤条件的协变常常使它混乱。我们在具有不同优势树种的两个西北欧洲温带落叶森林群落中研究了一个发展中的高森林系列：斯特拉里奥-樟子松（橡树角树冠层）和芦粟-法吉图姆（山毛榉冠层）。所有地块的土壤条件均无显着差异，因此可以调查长期缺乏光照对草皮下层的直接影响，与土壤变化的混杂影响无关。植物物种丰富度的测量随着冠层覆盖连续性的降低而降低。橡树角树原木的草本层，而山毛榉原木的草本层的丰富度表现出单峰响应。尽管如此，在植物群落中，物种丰富度和封闭森林物种丰富度受到林冠持续遮盖时间最长的林分长期缺乏光照的不利影响。结果表明，由于遮盖时间的延长，定量和定性光照的长期限制或下降是造成阿尔法多样性，群落组成转换和单个物种动态损失的主要驱动力。这两个社区都失去了嗜好性物种，而封闭森林的物种也减少了，这是长时间没有在森林地面上采光的直接结果。这项研究表明，长期连续的树冠覆盖介导的林地上没有光照会如何影响草本层。尽管不同遮阴树冠物种之间的草本层丰富度和组成在时间上有不同的响应，但长时间不光照的最终结果与优势树冠物种无关。

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