Affordable Access

deepdyve-link
Publisher Website

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

Authors
  • Dalgaard, T1
  • Hutchings, N
  • Dragosits, U
  • Olesen, J E
  • Kjeldsen, C
  • Drouet, J L
  • Cellier, P
  • 1 Aarhus University, Department of Agroecology, Blichers Allé 20, P.O. Box 50, DK-8830 Tjele, Denmark. [email protected] , (Denmark)
Type
Published Article
Journal
Environmental pollution (Barking, Essex : 1987)
Publication Date
Nov 01, 2011
Volume
159
Issue
11
Pages
3183–3192
Identifiers
DOI: 10.1016/j.envpol.2011.02.043
PMID: 21458123
Source
Medline
License
Unknown

Abstract

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.

Report this publication

Statistics

Seen <100 times