Environmental filtering drives mycorrhizal tree dominance across a soil fertility gradient in a temperate forest

Abstract Trees associated with arbuscular mycorrhizal (AM) and ectomycorrhizal (EcM) fungi are commonly thought to dominate in nutrient‐rich and nutrient‐poor environments, respectively. However, the mechanisms underlying this pattern remain poorly understood. Here, two potential drivers were evaluated: (i) environmental filtering , where soil fertility shapes tree species dominance by regulating growth and mortality; and (ii) tree‐mediated regulation , where trees modify soil conditions in ways