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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

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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