Understanding vegetation-environment relationships enables perceiving past and present patterns and to predict responses to future scenarios, thereby being useful for conservation and understanding evolutionary processes. In this context, the objective of our study was to test the hypothesis that niche processes at local scales (< 1 km2) are significantly expressive in plant communities structuring. For this, we selected the more representative and widely distributed sampled species, and then modelled their representativeness as a function of edaphic variables. The data were obtained in four fragments of seasonal semi-deciduous forests located in a transition area between the Atlantic and Cerrado biogeographic domains, Brazil. A total of 92 plots with 63 of 400 m2 and 29 of 300 m2 were randomly distributed in the fragments. Individuals that reached the inclusion criterion (circumference at breast height ≥ 15.7 cm) in each plot were measured and identified and soil samples were also collected. Then, we calculated the relative abundance and relative basal area in each plot. All species showed significant relationships with the soil variables, as their representativeness showed to be correlated (positively and/or negatively) with at least one restrictive fertility or texture condition. Therefore, the results confirm the tested hypothesis, evidencing the niche processing role in community structuring through the species tolerance degree to soil conditions.

中文翻译：

---

物种对塑造植物群落的土壤条件的耐受程度

了解植被-环境关系可以感知过去和现在的模式并预测对未来情景的反应，从而有助于保护和理解进化过程。在这种情况下，我们研究的目的是检验局部尺度（< 1 km2）的生态位过程在植物群落结构中具有显着表现力的假设。为此，我们选择了更具代表性和分布广泛的采样物种，然后将它们的代表性建模为土壤变量的函数。这些数据是在位于大西洋和巴西塞拉多生物地理域之间的过渡区的四个季节性半落叶林片段中获得的。总共有 92 个地块，其中 400 平方米的 63 块和 300 平方米的 29 块随机分布在碎片中。对每个地块中达到纳入标准（胸高周长≥ 15.7 cm）的个体进行测量和鉴定，并收集土壤样品。然后，我们计算了每个小区的相对丰度和相对基面积。所有物种都显示出与土壤变量的显着关系，因为它们的代表性表明与至少一种限制性肥力或质地条件相关（正和/或负）。因此，结果证实了测试假设，通过物种对土壤条件的耐受程度证明了生态位加工在群落结构中的作用。我们计算了每个小区的相对丰度和相对基面积。所有物种都显示出与土壤变量的显着关系，因为它们的代表性表明与至少一种限制性肥力或质地条件相关（正和/或负）。因此，结果证实了测试假设，通过物种对土壤条件的耐受程度证明了生态位加工在群落结构中的作用。我们计算了每个小区的相对丰度和相对基面积。所有物种都显示出与土壤变量的显着关系，因为它们的代表性表明与至少一种限制性肥力或质地条件相关（正和/或负）。因此，结果证实了测试假设，通过物种对土壤条件的耐受程度证明了生态位加工在群落结构中的作用。