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Predicting field N2O emissions from crop residues based on their biochemical composition: A meta-analytical approach

Abalos, Diego; Rittl, Tatiana; Recous, Sylvie; Thiébeau, Pascal; Topp, Cairistiona F.E.; van Groenigen, Kees Jan; Butterbach-Bahl, Klaus; Thorman, Rachel E.; Smith, Kate E.; Ahuja, Ishita; Olesen, Jørgen E.; Bleken, Marina A.; Ress, Robert and Hansen, Sissel (2022) Predicting field N2O emissions from crop residues based on their biochemical composition: A meta-analytical approach. Science of the Total Environment journal, 812, p. 15232.

[thumbnail of Abalos et al 2022.pdf] PDF - Published Version - English
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Crop residue incorporation is a common practice to increase or restore organic matter stocks in agricultural soils. How- ever, this practice often increases emissions of the powerful greenhouse gas nitrous oxide (N2O). Previous meta- analyses have linked various biochemical properties of crop residues to N2O emissions, but the relationships between these properties have been overlooked, hampering our ability to predict N2Oemissions from specific residues. Here we combine comprehensive databases for N2O emissions from crop residues and crop residue biochemical characteristics with a random-meta-forest approach, to develop a predictive framework of crop residue effects on N2O emissions. On average, crop residue incorporation increased soil N2O emissions by 43% compared to residue removal, however crop residues led to both increases and reductions in N2O emissions. Crop residue effects on N2O emissions were best pre- dicted by easily degradable fractions (i.e. water soluble carbon, soluble Van Soest fraction (NDS)), structural fractions and N returned with crop residues. The relationship between these biochemical properties and N2Oemissions differed widely in terms offormand direction. However, due to the strong correlations among these properties, wewere able to develop a simplified classification for crop residues based on the stage of physiological maturity of the plant at which the residue was generated. This maturity criteria provided the most robust and yet simple approach to categorize crop residues according to their potential to regulate N2O emissions. Immature residues (high water soluble carbon, soluble NDS and total N concentration, low relative cellulose, hemicellulose, lignin fractions, and lowC:N ratio) strongly stim- ulated N2O emissions, whereas mature residues with opposite characteristics had marginal effects on N2O. The most important crop types belonging to the immature residue group – cover crops, grasslands and vegetables – are important for the delivery ofmultiple ecosystem services. Thus, these residues should be managed properly to avoid their poten- tially high N2O emissions.

EPrint Type:Journal paper
Agrovoc keywords:
Biochemical composition
cover crops -> cover plants
Crop maturity
nitrogen dioxide
Subjects: Crop husbandry > Production systems
Environmental aspects > Air and water emissions
Research affiliation: Denmark > AU - Aarhus University
Norway > NORSØK - Norwegian Centre for Organic Agriculture
Germany > Other organizations
Deposited By: F Rittl, Tatiana
ID Code:43522
Deposited On:31 Jan 2022 08:08
Last Modified:26 Feb 2023 13:28
Document Language:English
Refereed:Peer-reviewed and accepted

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