Results/Conclusions: Non-invaded, ECM-dominated stands were characterized by low net nitrification rates, low soil pH, and high soil C:N, whereas non-invaded AM-dominated stands were characterized by high net nitrification rates, high soil pH, and low soil C:N. In support of our hypothesis, we observed the largest effect of M.v. in ECM-dominated stands. Averaging normalized effect sizes (g) across sample year for all three sites, we found M.v. enhanced net nitrification rates (1.93±0.40SE), soil pH (1.81±0.27SE), and reduced soil C:N ratios (1.27±0.38SE) in ECM-dominated stands. In contrast, the effects of invasion were near zero (ranging 0.27±0.14 to 0.59±0.09SE) in stands dominated by AM trees. Consistent with our initial hypothesis, we observed negative relationships between net nitrification (r2=0.43, p<0.0001), soil pH (r2=0.32, p<0.0001) and the relative abundance of ECM trees, and a positive relationship between soil C:N (r2=0.32, p<0.0001) and the relative abundance of ECM trees. However, in plots invaded by M.v., these relationships flattened, suggesting invasion may homogenize forests, reducing biogeochemical heterogeneity across the landscape. Collectively, our results illuminate how M.v. disproportionately alters biogeochemical conditions in environments where resident trees have the most dissimilar traits, and provides a conceptual framework for assessing invasive species impacts on ecosystem processes.