Taking into account the heterogeneity and the temporal variability of the soil structure to implement relevant soil hydraulic properties
| Autor: | Cousin, Isabelle, Tetegan, Marion, Chabbi, Abad, Korboulewsky, Nathalie |
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| Přispěvatelé: | Irstea Publications, Migration, Unité de recherche Science du Sol (USS), Institut National de la Recherche Agronomique (INRA), Université du Québec à Montréal = University of Québec in Montréal (UQAM), Unité de Recherche Pluridisciplinaire Prairies et Plantes Fourragères (P3F), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Ecosystèmes forestiers (UR EFNO) |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
[SDE] Environmental Sciences
sol caillouteux [SDE.MCG]Environmental Sciences/Global Changes échelle régionale évolution temporelle [SDU.STU]Sciences of the Universe [physics]/Earth Sciences propriété hydraulique du sol Sciences de la Terre PROPRIETE HYDRIQUE DYNAMIQUE DE L'EAU terre cultivée FONCTION DE PEDO TRANFERT [SDE]Environmental Sciences Earth Sciences propriété hydrique du sol fonctionnement hydrique échelle locale Milieux et Changements globaux ComputingMilieux_MISCELLANEOUS |
| Zdroj: | (15)2013; EGU, European Geosciences Union, General Assembly 2013, Vienne, AUT, 2013-04-07-2013-04-12, 1 p. Geophysical Research Abstracts EGU, European Geosciences Union, General Assembly 2013 EGU, European Geosciences Union, General Assembly 2013, Apr 2013, Vienne, Austria European Geosciences Union General Assembly 2013 European Geosciences Union General Assembly 2013, Apr 2013, Vienna, Austria. pp.1 |
| Popis: | International audience; Due to its position at the interface between the atmosphere and the vadose zone, the soil significantly contributes to the partitioning of rainfall into infiltration and overland flow, and, as a consequence, to the water feeding to plants and to the water aquifer level. The characteristics of the soil are usually described at the scale of the horizon, the latter being considered as the elementary component of the pedological maps and soil databases. As far as hydraulic properties are concerned – the water retention curve and the unsaturated hydraulic conductivity, the two essential soil characteristics for the description of soil water transfers -, their estimation at the horizon scale is then of major interest. Nevertheless, even at this scale, the horizon can usually not be considered neither as a homogeneous volume, nor as a time-stable system. As a consequence, methodologies have to be developed to characterize i) the degree of heterogeneity of the soil structure, ii) the evolution of the structure with time, and iii) if possible, the equivalent properties of such heterogeneous horizons. The surface horizons and the stony horizons can be considered as representative models of soil horizons to test these methodologies: the first ones because their fine structure evolves rapidly, under the effect of human agricultural activities – compaction by wheeling, fragmentation by tillage - of climate, or of faunal and vegetal actions; the second ones because the strong difference in material and in bulk density between fine earth and rock fragments lead to complex hydric behaviors. Based on several examples, the objectives of this presentation will then be i) to describe the temporal evolution of soil hydraulic properties in cultivated horizons, ii) to present methodologies for the estimation of equivalent soil hydraulic properties in stony horizons, and iii) to discuss the contribution of this new methodologies compared to old ones to better estimate the soil hydric functioning at the local or regional scales. |
| Databáze: | OpenAIRE |
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