Table 2 NEP, GPP and Re mean sensitivity to predictors for the 23 forests for the period 1995–2011.

From: Atmospheric deposition, CO2, and change in the land carbon sink

  NEP P GPP P Re P
CO2 (ppm) 4.81 ± 0.52 <0.0001 4.49 ± 0.75 <0.0001 −0.29 ± 0.60 0.3183
Nitrogen (kg ha−1 yr−1) −1.64 ± 15.96 0.4593 14.41 ± 19.39 0.2029 15.62 ± 18.65 0.2044
Sulphur (kg ha−1 yr−1) 24.45 ± 15.42 0.0616 −31.24 ± 18.52 0.0511 −74.01 ± 16.02 <0.0001
Temperature (K) −126.74 ± 408.16 0.4182 −137.36 ± 415.44 0.3716 80.46 ± 592.16 0.4464
SPEI (SD) 13.67 ± 2225.46 0.4976 645.30 ± 6256.23 0.4593 −238.29 ± 3255.54 0.4711
LAI (m2 m−2) −1.80 ± 66.73 0.4893 9.37 ± 76.01 0.4514 28.86 ± 104.40 0.3930
  1. Sensitivities (units of change in the response variable for each unit of change in the predictor) were calculated by dividing the temporal contributions of the predictor (Fig. 5) by the trend of the predictors (Figs 2 and 3, Table S2). Nitrogen and sulphur refers to atmospheric deposition, and temperature to mean annual air temperature. Errors were calculated by error propagation63. NEP, GPP and Re units are g C m−2 yr−1. Bold type indicates statistically significant sensitivities.