•The investigated crop types were winter wheat, maize, seed potato and sugar beet.•Maize presented larger CO2 flux peaks and seed potato exhibited the lowest CO2 fluxes.•NEE inter-annual variability was best explained by the active vegetation period.•The cropland behaved as an average C source of 82.5±54gCm−2yr−1.•The intercrop periods contributed greatly to the source effect of the carbon budget.
Agricultural and Forest Meteorology – Elsevier
Published: Nov 15, 2017
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