首页> 外文期刊>Journal of Vegetation Science >Trait assembly of woody plants in communities across sub-alpine gradients: identifying the role of limiting similarity.
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Trait assembly of woody plants in communities across sub-alpine gradients: identifying the role of limiting similarity.

机译:跨亚高山梯度群落中木本植物的性状组装:确定限制相似性的作用。

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Questions: Plant species can be assembled into communities through habitat filtering or species competition, but their relative roles are still debated. We do not know whether there is limited similarity between co-existing species when accounting for the parallel effect of abiotic habitat filtering and biotic competition. By accounting for such effects, we test the predictions of three theories (classic niche theory, the Hubbell neutrality theory and the Scheffer and van Nes theory) of community assembly. Location: Two vegetation transitions (a grazing gradient and a timber line ecotone) in a sub-alpine area of western Sichuan Province, China (31 degrees 51'N, 102 degrees 41'E). Methods: We used a null model to investigate the above plant community assembly theories on two sub-alpine gradients of woody vegetation. In the null model, species traits were constrained between the maximum and minimum trait values of observed communities to test the principle of limiting similarity between co-existing species by testing for even spacing of traits. We analysed traits characterizing growth strategies of stems, leaves and twigs, measured at the level of individuals in situ. Results: After accounting for variations in trait range, it became evident that six out of eight traits showed significantly uneven spacing within some plots, notably towards the forest end of the gradient, i.e. under increased competition pressure among woody plants. The Wilcoxon rank test showed that seven out of eight traits were significantly unevenly spaced within plots. The two transitions studied showed surprisingly similar patterns, despite their dissimilar precise drivers. Conclusion: Our results support the recent theory of Scheffer & van Nes, which suggests that competition could result in a clumped pattern of species along a niche axis.Digital Object Identifier http://dx.doi.org/10.1111/j.1654-1103.2011.01384.x
机译:问题:可以通过栖息地过滤或物种竞争将植物物种组装成社区,但它们的相对作用仍在争论中。当考虑到非生物栖息地过滤和生物竞争的平行影响时,我们不知道并存物种之间的相似性是否有限。通过考虑这种影响,我们测试了社区组装的三种理论(经典利基理论,哈贝尔中立性理论以及Scheffer和van Nes理论)的预测。位置:中国四川省西部亚高山地区(北纬31度,东经102度)两个植被过渡(放牧坡度和林线过渡带)。方法:我们使用零模型对两个亚高山梯度的木本植物进行了上述植物群落装配理论的研究。在无效模型中,将物种性状限制在观察到的群落的最大和最小性状值之间,以通过测试性状的均匀间隔来测试限制共存物种之间相似性的原理。我们分析了以茎原位水平衡量的茎,叶和细枝生长策略的特征。结果:考虑到性状范围的变化后,很明显,八分之六的性状在某些样地中显示出明显的不均匀间距,特别是在梯度的森林末端,即木本植物之间竞争压力的增加。 Wilcoxon等级检验表明,八个性状中的七个在地块内的间距明显不均匀。所研究的两个转换显示出令人惊讶的相似模式,尽管它们的精确驱动因素不同。结论:我们的研究结果支持了Scheffer和van Nes的最新理论,该理论表明竞争可能导致沿利基轴的物种结块模式。数字对象标识符http://dx.doi.org/10.1111/j.1654- 1103.2011.01384.x

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