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Effects of farm heterogeneity and methods for upscaling on modelled nitrogen losses in agricultural landscapes Organic Eprints
Dalgaard, Tommy; Hutchings, Nicholas J.; Dragosits, U.; Olesen, J.E.; Kjeldsen, Chris; Drouet, J.L.; Cellier, P..
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...
Tipo: Journal paper Palavras-chave: Air and water emissions; Landscape and recreation; Farm nutrient management.
Ano: 2011 URL: http://orgprints.org/19043/4/19043.pdf
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Remote sensing based mapping of leaf nitrogen and leaf area index in European landscapes using the REGularized canopy reFLECtance (REGFLEC) model Organic Eprints
Boegh, E.; Houborg, R.; Bienkowski, J.; Braban, C.; Dalgaard, T.; van Dijk, N.; Dragosits, U.; Holmes, E.; Magliulo, V.; Schelde, K.; Di Tommasi, P.; Vitale, V..
Mapping was conducted using the REGFLEC model which is an automatic and image-based methodology developed for regional chlorophyll (Cab) and LAI estimation (i.e., Houborg et al., 2007; Houborg and Boegh, 2008; Houborg and Andersen, JARS 3, 2009). REGFLEC combines models for atmospheric correction (6S), canopy reflectance (ACRM) and leaf optics (PROSPECT). The REGFLEC tool corrects for impacts of atmospheric scattering and absorption, soil background reflectance and species specific vegetation characteristics (ie. leaf angle distribution). In this study, the REGFLEC model tool is applied to high spatial (10-20 m) resolution SPOT satellite data for mapping LAI and leaf N of agricultural landscapes located in Denmark, Poland, Scotland, the Netherlands and...
Tipo: Conference paper, poster, etc. Palavras-chave: Biodiversity and ecosystem services; Landscape and recreation; Farm nutrient management.
Ano: 2011 URL: http://orgprints.org/19046/4/19046.pdf
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