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Effects of farm heterogeneity and methods for upscaling on modelled nitrogen losses in agricultural landscapes

Dalgaard, Tommy; Hutchings, Nicholas J.; Dragosits, U.; Olesen, J.E.; Kjeldsen, Chris; Drouet, J.L. and Cellier, P. (2011) Effects of farm heterogeneity and methods for upscaling on modelled nitrogen losses in agricultural landscapes. Environmental Pollution, 159 (11), 3183-3192.

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Summary in the original language of the document

The aim of this study is to illustrate the importance of farm scale heterogeneity on nitrogen (N) losses in agricultural landscapes. Results are exemplified with a chain of N models calculating farm-N balances and distributing the N-surplus to N-losses (volatilisation, denitrification, leaching) and soil-N accumulation/release in a Danish landscape. Possible non-linearities in upscaling are assessed by comparing average model results based on (i) individual farm level calculations and (ii) averaged inputs at landscape level. Effects of the non-linearities that appear when scaling up from farm to landscape are demonstrated.
Especially in relation to ammonia losses the non-linearity between livestock density and N-loss is significant (p > 0.999), with around 20-30% difference compared to a scaling procedure not taking this non-linearity into account. A significant effect of farm type on soil N accumulation (p > 0.95) was also identified and needs to be included when modelling landscape level N-fluxes and greenhouse gas emissions.


EPrint Type:Journal paper
Subjects: Environmental aspects > Air and water emissions
Environmental aspects > Landscape and recreation
Farming Systems > Farm nutrient management
Research affiliation: Denmark > DARCOF III (2005-2010) > REFUGIA - The role of Organic Farms as refugia for biodiversity
DOI:10.1016/j.envpol.2011.02.043
Deposited By: Dalgaard, Head of research unit Tommy
ID Code:19043
Deposited On:29 Jun 2011 14:36
Last Modified:28 May 2013 09:46
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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