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Résultats de la recherche (20 résultats)

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  • Influence of soil properties on the aggregation of some Mediterranean soils and the use of aggregate size and stability as land degradation indicators
  • Soil aggregation in arid and semi-arid environments
  • Aggregate ; Alicante ; Clay mineral ; Grain size distribution ; Indicator ; Mediterranean area ; Organic materials ; Soil ; Soil degradation ; Soil erosion ; Soil properties ; Soil water ; Spain
  • Soil aggregation in relation to other soil properties was studied along a climatological transect in the Southeast of Spain. Three sites were selected along this transect ranging from semiarid to subhumid climatological conditions. The aggregate
  • size distribution, the macro and microaggregate stability of the superficial soil horizon and their relations with other soil properties were analysed. A general conceptual scheme of associations between aggregate size distribution, water-stable
  • 2001
  • Multiscale statistical models for hierarchical spatial aggregation
  • Data analysis ; Model ; Scale ; Space time ; Spatial aggregation ; Spatial analysis ; Statistics
  • defined partitions, corresponding to successive aggregations of an initial data space. The effects of scale associated with such aggregation are captured through a fundamental decomposition of the data likelihood.
  • 2001
  • Aggregate stability for soil quality assessments
  • Soil aggregation in arid and semi-arid environments
  • Aggregate ; Agropedology ; Land use ; Methodology ; Soil ; Soil properties ; United States of America
  • The most common method for measuring aggregate stability in water is wet sieving. The objective of this paper is to present a low cost modified version of this method that does not require the use of a mechanized wet-sieving machine and can
  • 2001
  • Field soil aggregate stability kit for soil quality and rangeland health evaluations
  • Soil aggregation in arid and semi-arid environments
  • Aggregate ; Ecosystem ; Land use ; Methodology ; New Mexico ; Soil ; Soil properties ; United States of America ; Vegetation
  • Soil aggregate stability is widely recognized as a key indicator of soil quality and rangeland health. A stability kit is described which can be inexpensively and easily assembled with minimal tools. It permits up to 18 samples to be evaluated
  • 2001
  • Temporal changes in soil aggregates and water erosion after a wildfire in a Mediterranean pine forest
  • Soil aggregation in arid and semi-arid environments
  • Aggregate ; Forest fire ; Mediterranean area ; Rill wash ; Soil ; Soil properties ; Spain ; Valencia ; Water erosion
  • This study analyses the temporal evolution on soil aggregates, induced by the effect of fire on 2 burned zones representative of a typical Mediterranean pinewood forest, near Valencia, Spain. These zones have different slope position in the same
  • 2001
  • efficiency, technological change, and - both aggregated as overall index - on Total Factor Productivity (TFP). - (L'A.).
  • 2001
  • The A. examines the case where the main restrictive assumptions are that all users have the same choice set and that all alternatives have the same monetary cost. For the model, any toll reform that reduces aggregate travel time and redistributes
  • 2001
  • Correlation ; Distance ; Distribution of points ; Population ; Spatial aggregation ; Spatial analysis ; Spatial distribution ; Statistics ; United States of America
  • 2001
  • Les AA. analysent les disparités des taux d'épargne personnelle selon les régions espagnoles, période 1986-94. En accord avec les principes du cycle de vie, ils présentent les principaux déterminants économiques de ces taux (modèle agrégé d'épargne
  • 2001
  • Des données historiques et socio-économiques servent à évaluer les élasticités dans une modélisation non-linéaire de l'avantage comparatif dynamique lors d'un partage sous-régional de prévisions agrégées au niveau régional. L'accent est mis sur la
  • 2001
  • This paper discusses the effects of water quality on the hydrological and erosion response of non-saline, non-sodic soils during simulated rain experiments. Two soils, a well-aggregated clay-rich soil developed on marine silty clay deposits
  • 2001
  • Data analysis ; Illiteracy ; India ; Model ; Population census ; Social group ; Spatial aggregation ; Spatial scale ; Statistics
  • 2001
  • Sustainable development policy is examined for the Belfast Matropolitan Area using a range of linked aggregate and disaggregate models. Energy trade-offs are modelled for both private dwellings and traffic-related energy sources. Land-use policies
  • 2001
  • L'A. examine la structure de la corrélation spatiale de la croissance économiques entre comtés contigus aux Etats-Unis. Les corrélogrammes spatiaux estimés sur les données provenant de quatre mesures différentes de l'activité économique agrégée
  • 2001
  • Aggregate ; Experiment plot ; Infiltration ; Model ; Rainfall simulation ; Soil erosion ; Soil moisture ; Water ; Weathering
  • 2001
  • Cet ouvrage est constitué d'une série de 15 dossiers destinés aux étudiants préparant le CAPES et l'AGREGATION. Ces dossiers sont répartis en 3 thèmes : unité ou diversité, eau et environnement, le carrefour, ses sociétés et ses activités. Le choix
  • 2001
  • communes sont agrégées en catégories d'évolution comparable selon une méthode utilisant la cluster analysis de Ward. Les 17 types d'évolution auxquels on aboutit (11 de croissance, 1 de stagnation et 5 de régression) permettent de cerner l'évolution de la
  • 2001
  • The relative effect on the results of macrozoobenthic monitoring programmes by the application of different types of measures and taxonomic aggregation levels on Abra de Bilbao hard bottoms has been studied by means of second stage multivariate
  • 2001
  • un outil de décision multi-participant et multi-critère sur la base d'un SIG (R.D. Feick et G.B. Hall). 7. La modélisation des transactions sur Internet selon un processus stochastique dépendant du temps : application au modèle spatio-temporel agrégé
  • 2001
  • in sustaining the regenerated primary production, seemed to act as a potential microbial barrier to the organic matter sedimentation (intense bacterial hydrolysis measured in sinking aggregates).
  • 2001