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Is there environmental differentiation in the Quercus-dominated forests of west-central Mexico?

机译:墨西哥中西部的以栎属为主的森林是否存在环境差异?

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Detailed information on 38 species and 26 environmental variables was recorded from a network of 86 permanent plots across a geographical range of 10 km, in order to determine the patterns of floristic composition in Quercus-dominated forests; to elucidate environmental differentiation in such forests; and to determine whether species are partitioning their environment. To examine likely patterns of floristic composition, a data matrix expressed as relative volume + relative density was used to run non-metric multidimensional scaling. Canonical correspondence analysis extracted the environmental variation that best correlates with the observed patterns of floristic composition. Our results indicate that congeneric Quercus individuals represent the largest proportion of the species pool in the study plots. They coexist with other species having similar ecological requirements in at least three distinct floristic groups. Examination of the two largest groups and their species compositions reveals that one floristic gradient runs across the most xeric zone of the study area, and the second major floristic gradient runs across a mesic zone. The most important environmental variable explaining the observed patterns of floristic composition is altitude, although partial canonical correspondence analysis suggests that micro-habitat heterogeneity (catena position and canopy maturity) was most significant.
机译:从一个10公里地理范围内的86个永久样地网络中记录了有关38个物种和26个环境变量的详细信息,以便确定以栎属为主的森林的植物组成模式。阐明这种森林的环境差异;并确定物种是否正在划分环境。为了检查植物区系组成的可能模式,使用表示为相对体积+相对密度的数据矩阵进行非度量多维标度。典型对应分析提取了与观察到的植物区系模式最相关的环境变化。我们的结果表明,在研究区中,同类栎种群占物种库的最大比例。它们与至少三个不同的植物群中具有相似生态学要求的其他物种共存。对两个最大类群及其物种组成的检查表明,一个植物区系梯度分布在研究区域的最干燥区域,而第二个主要植物区系梯度分布在一个中斜区域。解释所观察到的植物区系格局的最重要环境​​变量是海拔,尽管部分典型对应分析表明,微生境异质性(类别位置和树冠成熟度)最为显着。

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