Data/hora: 16/06/2024 06:33:37

Provedor de dados: 	21	
País: 	Germany	
Título: 	Effects of farm heterogeneity and methods for upscaling on modelled nitrogen losses in agricultural landscapes	
Autores: 	Dalgaard, Tommy; Hutchings, Nicholas J.; Dragosits, U.; Olesen, J.E.; Kjeldsen, Chris; Drouet, J.L.; Cellier, P.	
Data: 	2011	
Ano: 	2011	
Palavras-chave: 	Air and water emissions; Landscape and recreation; Farm nutrient management.	
Resumo: 	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 &gt; 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 &gt; 0.95) was also identified and needs to be included when modelling landscape level N-fluxes and greenhouse gas emissions.	
Tipo: 	Journal paper	
Identificador: 	http://orgprints.org/19043/4/19043.pdf

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.	
Relação: 	http://orgprints.org/19043/	
Formato: 	application/pdf