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Long-term effects of cropping system on N2O emission potential

Petersen, Søren O.; Ambus, Per; Elsgaard, Lars; Schjønning, P. and Olesen, Jørgen E. (2013) Long-term effects of cropping system on N2O emission potential. Soil Biology and Biochemistry, 57, pp. 706-712.

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Document available online at: http://www.sciencedirect.com/science/article/pii/S0038071712003458


The potential for N2O emissions outside the main growing season may be influenced by long-term effects of cropping system. This was investigated by collecting intact soil cores (100 cm3, 0-4 cm depth) under winter wheat in three organic cropping systems and a conventional reference within a long-term crop rotation experiment. Average annual inputs of C in crop residues and manure ranged from 1.7 to 3.3 Mg ha-1. A simulated freeze-thaw cycle resulted in a flush of CO2 during the first 48 h, which could be mainly from microbial sources. Other samples were adjusted to approximately –10, -30 or –100 hPa and amended with excess 15NO3- prior to freezing and thawing. Denitrification was the main source of N2O during a 72-h incubation at 22C, as judged from N2O and total 15N evolution. Although the input of C in the conventionally managed cropping system was significantly less than in the organic cropping systems, it showed higher N2O evolution at all three matric potentials. Estimates of relative gas diffusivity (DP/D0) in soil from the four cropping systems indicated that C input affected soil aeration. Soil from the two cropping systems with highest C input showed N2O evolution at DP/D0 in excess of 0.02, which is normally considered a threshold for development of anaerobic sites in the soil, presumably because the oxygen demand was also high. The study shows that cropping system affects both soil gas diffusivity and C availability, and that both characteristics significantly influence the N2O emission potential.

EPrint Type:Journal paper
Subjects: Soil > Soil quality > Soil biology
Environmental aspects > Air and water emissions
Farming Systems > Farm nutrient management
Research affiliation: Denmark > DARCOF III (2005-2010) > CROPSYS - The effect of cropping systems on production and the environment
Denmark > CROPSYS
Deposited By: Petersen, Dr. Søren O.
ID Code:22014
Deposited On:27 Dec 2012 10:24
Last Modified:06 Jun 2022 15:58
Document Language:English
Refereed:Peer-reviewed and accepted

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