Corrigendum to "Responses of N 2 O and CH 4 fluxes to fertilizer nitrogen addition rates in an irrigated wheat-maize cropping system in northern China" published in Biogeosciences, 9, 839–850, 2012

f(x) = 76.41‐34.21· 0.997x 0.98 < 0.01 Fig. 3a Wheat: f(x) = 8.03‐1.74· 0.996 x 0.90 < 0.01 Fig. 3b Wheat straw: f(x) = 5.49 + 0.002·x 0.79 < 0.05 Maize: f(x) = 9.16‐4.24· 0.997x 0.96 < 0.01 Wheat grain: f(x) = 21.15 + 0.005·x 0.74 < 0.05 Wheat + Maize: f(x) = 16.51‐5.36· 0.996 x 0.95 < 0.01 Maize straw: f(x) = 8.03 + 0.009·x 0.80 < 0.05 Maize grain: f(x) = 12.51 + 0.004·x 0.90 < 0.01 Fig. 5a WS: f(x) = 0.41 + 0.0017·x 0.94 < 0.01 Fig. 5b MS: f(x) = 0.49‐0.0006·x 0.77 < 0.05 MS: f(x) = 1.01 + 0.0073·x 0.97 < 0.01 AS: f(x) = 1.50‐0.0003·x 0.82 < 0.05 AS: f(x) = 1.44 + 0.0049·x 0.99 < 0.01 Fig. 5c WS: