Extended Data Table 4 Summarised results of linear mixed-effects models

From: Rising atmospheric CO2 reduces nitrogen availability in boreal forests

  1. Summarised results of linear mixed-effects models with response variable, δ15N, as a response to fixed main effects: a, absolute volume growth (m3 ha−1 yr−1), relative forest volume growth change (m3 ha−1), and random effect of grid cell; and b, total basal area (m2 ha−1), relative forest volume growth change (m3 ha−1), and random effect of grid cell in relation to response variable, δ15N. Restricted maximum likelihood (REML) was applied to both models. Significant values (P < 0.05) in bold, italics. A variance inflation factor (VIF) limit of 5 was used to indicate an acceptable level of collinearity. R2marginal (R2m, fixed effects only) and R2conditional (R2c, fixed and random effects) are reported for each model. Data sources are cited in the Methods.
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