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Titre :
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Measuring and modelling nitrogen leaching: Parallel problems
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Auteurs :
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T. Addiscott
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Type de document :
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article/chapitre/communication
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Année de publication :
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1996
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Format :
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p. 1-6
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Langues:
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= Anglais
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Catégories :
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HYDROLOGIE ET HYDRAULIQUE
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Mots-clés:
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LESSIVAGE DU SOL
;
AZOTE
;
MODELISATION
;
MESURE
;
ARGILE
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Résumé :
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In studies of nitrate leaching both experimenters and modellers experience problems arising from soil variability. Because of the small-scale heterogeneity that gives rise to mobile and immobile categories of water, both measurements and modelling are easiest in homogeneous sandy soils and most difficult in strongly structured clay soils. There are also parallels at plot and field scale in the problems caused to experimenters by log-normal distributions of nitrate concentrations and those caused to modellers by non-linearity in models. All researchers need to be aware that a reliable estimate of the mean from a set of measurements or a model may necessitate considerations of variances as well as means.
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Source :
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Plant and soil, vol.181
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