Extended Data Table 2 Differences between TF and BD for NH₄⁺, NO₃⁻, and TN fluxes expressed as NH₄⁺-N, NO₃⁻-N, and TN measured at each site. Differences are calculated from the annual deposition in 2016 and from long-term averages. We also report results from the two-sided t-test (for NO₃⁻-N and TN) and the Wilcoxon-Mann-Whitney test (for NH₄⁺-N) for differences calculated for TF and BD fluxes in 2016. Diff indicates the difference between TF and BD for each form of nitrogen, and CI and df indicate the confidence interval and degrees of freedom, respectively. The sites follow a latitudinal order from north to south

From: Substantial contribution of tree canopy nitrifiers to nitrogen fluxes in European forests