The influence exerted by tree communities, topography, and soil chemistry on the assembly of macrofungal communities remains poorly understood, especially in highly diverse tropical forests. Here, we used a large dataset that combines inventories of macrofungal Basidiomycetes fruiting bodies, tree species composition, and measurements for 16 soil physicochemical parameters, collected in 34 plots located in four sites of lowland rain forests in French Guiana. Plots were established on three different topographical conditions: hilltop, slope, and seasonally flooded soils. We found hyperdiverse Basidiomycetes communities, mainly comprising members of Agaricales and Polyporales. Phosphorus, clay contents, and base saturation in soils strongly varied across plots and shaped the richness and composition of tree communities. The latter composition explained 23% of the variation in the composition of macrofungal communities, probably through high heterogeneity of the litter chemistry and selective effects of biotic interactions. The high local heterogeneity of habitats influenced the distribution of both macrofungi and trees, as a result of diversed local soil hydromorphic conditions associated with contrasting soil chemistry. This first regional study across habitats of French Guiana forests revealed new niches for macrofungi, such as ectomycorrhizal ones, and illustrates how macrofungi inventories are still paramount to can be to understand the processes at work in the tropics.

中文翻译：

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树木群落和土壤性质影响新热带森林真菌群落的组装

树木群落，地形和土壤化学对大型真菌群落聚集的影响仍然知之甚少，尤其是在高度多样化的热带森林中。在这里，我们使用了一个大型数据集，该数据集汇总了法属圭亚那低地雨林的四个地点的34个样地中收集的大型真菌担子菌子实体清单，树木种类组成以及16种土壤理化参数的测量值。在三种不同的地形条件下建立了样地：山顶，坡度和季节性洪水土壤。我们发现了多种多样的担子菌群落，主要由Agaricales和Polyporales的成员组成。土壤中的磷，粘土含量和碱饱和度在各个样地之间变化很大，并塑造了树木群落的丰富度和组成。后者的组成解释了大真菌群落组成变化的23％，这可能是由于凋落物化学的高度异质性和生物相互作用的选择性作用所致。栖息地的高度异质性影响了大型真菌和树木的分布，这是由于不同的土壤化学形态条件导致土壤化学形态的差异。这项对法属圭亚那森林栖息地的首次区域研究揭示了大型真菌的利基，例如外生菌根，并阐明了大型真菌清单对于了解热带地区的工作过程仍然至关重要。栖息地的高度异质性影响了大型真菌和树木的分布，这是由于不同的土壤化学形态条件导致土壤化学形态的差异。这项对法属圭亚那森林栖息地的首次区域研究揭示了大型真菌的利基，例如外生菌根，并阐明了大型真菌清单对于了解热带地区的工作过程仍然至关重要。栖息地的高度异质性影响了大型真菌和树木的分布，这是由于不同的土壤化学形态条件导致土壤化学形态的差异。这项对法属圭亚那森林栖息地的首次区域研究揭示了大型真菌的利基，例如外生菌根，并阐明了大型真菌清单对于了解热带地区的工作过程仍然至关重要。