Geographic distinctions in the affinity of tree populations for select ectomycorrhizal fungi (EMF) may occur where strong edaphic pressures act on fungal communities and their hosts. We examine this premise for Pseudotsuga menziesii var. menziesii of southwest British Columbia, using ten native seedlots collected from a range of mean annual precipitation (MAP), as a proxy for podzolization extent and phosphorus (P) deficiencies, and evaluated in contrasting low P and high P soils. After two growing seasons, seedling biomass in the high P soil dwarfed that of the low P soil, and better growth rates under high P were detected for populations from very dry and very wet origins. EMF communities on the high P soil displayed more symmetry among host populations than the low P soil (average community dissimilarity of 0.20% vs. 0.39%, respectively). Seedling foliar P% differed slightly but significantly in relation to MAP of origin. EMF species richness varied significantly among host populations but independently of climatic parameters. There were significant shifts in EMF species abundance related to seedlot MAP, particularly on the low P soil where nonlinear relationships were found for Wilcoxina mikolae, Hyaloscypha finlandica, and Rhizopogon villosulus. Despite efforts to enhance colonization by native fungi, the predominance of ruderal EMF species hindered a realistic evaluation of local adaptation among host–fungi populations. Nevertheless, the shifting affinity in taxa abundance and wider community disparity on low P soil reflected the potential for a consequential host genetic effect related to geographical patterns in P availability across temperate rainforests.

树木种群对特定外生菌根真菌 (EMF) 的亲和力的地理差异可能发生在强大的土壤压力作用于真菌群落及其宿主的地方。我们检查Pseudotsuga menziesii变种的这个前提。孟子不列颠哥伦比亚省西南部，使用从一系列年平均降水量 (MAP) 中收集的十个原生种子地，作为灰化程度和磷 (P) 缺乏的代表，并在对比低 P 和高 P 土壤中进行评估。两个生长季后，高磷土壤中的幼苗生物量使低磷土壤中的幼苗生物量相形见绌，并且在高磷条件下，来自非常干燥和非常潮湿起源的种群的生长速度更好。与低磷土壤相比，高磷土壤上的 EMF 群落在寄主种群中表现出更多的对称性（平均群落差异分别为 0.20% 和 0.39%）。幼苗叶面 P% 与 MAP 来源略有不同但显着。EMF 物种丰富度在宿主种群之间差异很大，但与气候参数无关。Wilcoxina mikolae、Hyaloscypha finlandica和Rhizopogon villosulus。尽管努力增强本地真菌的定植，但粗鲁的 EMF 物种的优势阻碍了对宿主-真菌种群的局部适应性的现实评估。然而，低磷土壤上类群丰度的亲和力变化和更广泛的群落差异反映了与温带雨林磷可用性地理模式相关的宿主遗传效应的可能性。