两个植物群落的区系组成的连续体-长形加西- alnetum和白蜡草- alnetum

Q4 Agricultural and Biological Sciences
Natalia Czapiewska, Sonia Paź, M. Dyderski, A. Jagodziński
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引用次数: 4

摘要

植物群落是不连续的、可区分的单位还是连续变化的单位是植被生态学中一个重要的争论。植物社会学假定不连续性,其方法需要在植被清查期间进行主观抽样。出于这个原因,一些研究人员认为植物社会学人为地在植物群落之间制造了不连续性。我们的目的是评估灰桤木河岸林(Fraxino-Alnetum)和桤木沼泽林(Carici elongatae-Alnetum)之间的连续性,并检查这两种植物关联之间的不连续性是否是主观样地选择的影响。我们在一个覆盖两个植物群落潜在地点的规则网格内进行了57项植物社会学相关的研究。各诊断种的相对盖度依次递减,呈现出平缓的梯度,表明从白蜡草-白蜡草向长形白蜡草-白蜡草的连续过渡。通过非趋势对应分析,得到了相似的结果。以白蜡属为典型的栎茶类所占的种数比例呈下降趋势,而以长形木犀属为典型的木犀叶属所占的种数比例呈上升趋势。这种变化遵循生态光湿指标值的梯度。我们的研究结果证实了两个植物群落之间的连续过渡,并使我们得出结论,不连续性是由经典植物社会学中使用的标准采样方案造成的。然而,该协议在寻找植物群落分类所需的类型模式方面是有用的,这是植物社会学的主要目标。然而,它不能提供对植被可变性的全面洞察,并且在试图理解生态系统动力学时引入了不确定性。在利用植物社会学数据提出自然保护建议和得出关于植被动态的结论时,应考虑到这种不确定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Continuum of floristic composition between two plant communities – Carici elongatae-Alnetum and Fraxino-Alnetum
Abstract One of the crucial debates in vegetation ecology is whether plant communities are discontinuous, distinguishable units or whether they change continuously. Phytosociology assumes discontinuity and its methodology requires subjective sampling during vegetation inventories. For that reason, some researchers argue that phytosociology artificially creates discontinuity among plant communities. Our aim was to assess the continuity between ash-alder riparian forest (Fraxino-Alnetum), and alder swamp forest (Carici elongatae-Alnetum), and to check whether discontinuity observed between these two plant associations is an effect of subjective sample plot choice. We conducted 57 phytosociological relevés within a regular grid covering potential sites of both plant communities. All relevés were arranged in order of decreasing relative cover of the diagnostic species for each plant association resulting in a gentle gradient, indicating a continuous transition from Fraxino-Alnetum to Carici elongatae-Alnetum. Similar results were obtained by detrended correspondence analysis. The proportion of species from the Querco-Fagetea class, typical to Fraxino-Alnetum, was decreasing with increasing proportion of species from the Alnetea glutinosae class, typical to Carici elongatae-Alnetum. This shift followed a gradient of ecological light-moisture indicator values. Our results confirmed continuous transition between two plant communities and led us to the conclusion that discontinuity resulted from the standard sampling protocol used in classical phytosociology. This protocol, however, is useful in searching for typological patterns, required for classification of plant communities, which is the main aim of phytosociology. Nevertheless, it does not provide full insight into the variability of vegetation and introduces uncertainty when trying to understand ecosystem dynamics. This uncertainty should be taken into account when phytosociological data are used for nature conservation recommendations and to draw conclusion about vegetation dynamics.
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来源期刊
USDA Forest Service - Research Papers PNW-RP
USDA Forest Service - Research Papers PNW-RP Agricultural and Biological Sciences-Forestry
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