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.
Back to article page