Journal Article Soil Research Support, Non-U.S. Gov't absorptive root arbuscular mycorrhizas and ectomycorrhizas root economics root trait variation trait interplay trait-function linkage 7440-44-0 Carbon Nitrates Published Erratum absorptive roots canopy tree thinning chemical niche differentiation morphological-physiological trait trade-offs mycorrhizal fungi nutrient uptake root functional traits root trenching root-fungal interactions soil respiration successional stages temperature sensitivity understory plant removal