Table 2. Regression relationships between soil N:P ratios and aggregate categories of C, N and P substrate metabolism in metagenome and PICRUSt data (shown in Figure 2a).

Data source	Ccarb	Carom	Ndiss	Nassim	Puptk	Pscav
Metagenome	0.84	0.72	0.64	0.80	0.58	0.84
PICRUSt	0.58	0.49	0.34	0.53	0.55	0.55
Metagenome vs PICRUSt	0.70	0.55	0.48	0.34	0.17	0.81

Abbreviation: PICRUSt, Phylogenetic Investigation of Communities by Reconstruction of Unobserved States. Data are R² from linear models, with transformation by Box–Cox or quadratic regression models (italicized) as needed to satisfy model assumptions. All models shown had P⩽0.001; boldface shows R²⩾0.5.