Predicting runoff from semi-arid hillslopes as source areas for water harvesting in the Sierra de Gador, southeast Spain
Andalusia ; Aridarea ; Model ; Mountain ; Precipitation ; Runoff ; Semi-aridarea ; Spain ; Water resources
Andalucía ; Domaine aride ; Domaine semi-aride ; Ecoulement ; Espagne ; Modèle ; Montagne ; Précipitation ; Ressource en eau ; Sierra de Gádor
The aim of this paper is to evaluate the effectiveness of semi-arid hillslopes in generating runoff for water harvesting systems. Runoff was estimated by the STREAM expert-based model which was applied to three semi-arid hillslopes in the Sierra de
La désertification du Nordeste brésilien, d'origine essentiellement anthropique, a d'ores et déjà pour effet une réduction significative de l'abondance des précipitations du domaine semi-aride, ce qui ne peut à son tour qu'accélérer le processus de
dégradation de l'environnement. Mais suivant l'ampleur du phénomène, les impacts sont variables d'un secteur à l'autre, et n'excluent pas des renforcements locaux de la pluviométrie, surtout vers le Sud de la zone semi-aride. – (JPB)
Domaine aride ; Domaine semi-aride ; Humidité du sol ; Kenya ; Nutriment ; Productivité ; Propriétés du sol ; Ravinement ; Sol ; Végétation
Factors limiting productivity of overgrazed, semi-arid rangelands on the Njemps Flats, Kenya were investigated, conducting fertilization and irrigation experiments. Productivity was evaluated in terms of yield, vegetation quality and soil chemical
La variabilité pluviométrique est particulièrement forte au printemps et en automne dans les stations semi-arides de l'Ouest de l'Éthiopie. En été, où les impacts sur la production agricole sont les plus marqués, la variabilité s'atténue dans
The dynamics of soluble salts concentration in the soil was investigated at seven research stations in Israel that represent four climatic regions : Mediterranean, semi-arid, mildly arid and arid. Measurements were taken in different seasons from
Validation of a dust production model from measurements performed in semi-arid agricultural areas of Spain and Niger
Aeolian features ; Aeolian transport ; Aerosol ; Aridarea ; Cultivated land ; Experimentation ; Model ; Niger ; Semi-aridarea ; Soil erosion ; Soil properties ; Spain ; Wind
Aérosol ; Domaine aride ; Domaine semi-aride ; Eolien ; Erosion des sols ; Espagne ; Expérimentation ; Modèle ; Niger ; Propriétés du sol ; Sol cultivé ; Transport éolien ; Vent
Models of 2 processes (saltation and sandblasting) that lead to fine dust release in aridareas have recently been combined to form a dust production model (DPM), the physical bases of which are summarized. In order to validate DPM at field scale
, its predictions in terms of horizontal and vertical mass fluxes are compared to direct measurements made in natural conditions on a silt loam soil in north-east Spain during Wind Erosion and loss of SOil Nutrients in semi-arid Spain (WELSONS
Approche globale de la connaissance et du fonctionnement d'un milieu tellien fragile en Oranie intérieure: composantes physiques et humaines, contraintes et difficile aménagement d'un bassin-versant semi-aride. - (ABE)
Approaching local limits to field expansion. Land use pattern dynamics in semi-arid Burkina Faso
Aerial photography ; Agropedology ; Burkina ; Cultivated land ; Land use ; Population growth ; Semi-aridarea ; Subsistence agriculture ; Thematic mapping
Agriculture de subsistance ; Agropédologie ; Burkina ; Cartographie thématique ; Croissance démographique ; Domaine semi-aride ; Photographie aérienne ; Sol cultivé ; Utilisation du sol
The objective of this paper is to evaluate in what ways subsistence farmers in semi-arid West Africa contribute to this process of change by altering their land use patterns in response to increased demographic pressure and environmental constraints
The geomorphology of the Nyl River and floodplain in the semi-arid Northern Province, South Africa
Floodplain ; Habitat ; Humid environment ; Nature conservation ; Northern Province ; Semi-aridarea ; South Africa
Afrique du Sud ; Domaine semi-aride ; Habitat ; Milieu humide ; Northern Province ; Plaine d'inondation ; Protection de la nature
The Nylsvlei wetland is situated on the floodplain of the lower Nyl River in the semi-arid Limpopo Province. Correct identification of the factors giving rise to such wetlands, and the hydogeomorphological processes governing their development
Despite the important role trees play in semi-aridareas, very few data are available on growth of trees and distribution in relation to site. The study was carried out in the Njemps Flats of central Baringo, Kenya. Analysis of the woodland
for the species in the area. This study has also revealed that semi-aridareas can support much higher proportions of woody vegetation than are usually reported.
structure was achieved by stratifying the area into six separate sites on the basis of tree density and their location relative to ephemeral streams and drainage channels. Results of the survey revealed an extremely low count of seedlings/saplings
Using botanical evidence for the determination of erosion rates in semi-arid tropical areas
Soil erosion, land degradation and social transition. Geoecological analysis of a semi-arid tropical region, Kenya
Dendrochronology ; Dendrology ; Kenya ; Methodology ; Semi-aridarea ; Soil erosion ; Tropical zone
Dendrochronologie ; Dendrologie ; Domaine semi-aride ; Erosion des sols ; Kenya ; Méthodologie ; Zone intertropicale
An analysis of using exposed tree roots or tree mounds as benchmarks for the estimation of erosion rates was carried out in the semi-arid Baringo District in Kenya. The biggest problem encountered in the application of this technique in tropical
areas, is the difficulty of ageing the trees. Therefore, the wood structure of several species growing in the study area was examined, and a number of wood samples dendrochronologically analyzed. The possibility of using root wood for dating is discussed.
La ville à l'épreuve du milieu aride et semi-aride
Adaptation ; Aridarea ; Man-environment relations ; Natural environment ; Semi-aridarea ; Town ; Urban climate ; Water management
Adaptation ; Climat urbain ; Contrainte naturelle ; Domaine aride ; Domaine semi-aride ; Gestion de l'eau ; Milieu naturel ; Relation homme-environnement ; Ville
Le milieu aride ou semi-aride détermine à peu près partout des contraintes de même nature (très fortes chaleurs, manque d'eau structurel, environnement peu nourricier…), sinon de même intensité, mais les réponses apportées par les populations et la
Landscape state change in the semi-arid Sabie River, Kruger National Park, in response to flood and drought
Aridarea ; Climatic variability ; Drought ; Flood ; Impact ; National park ; Precipitation ; Riparian vegetation ; Seasonal variation ; Semi-aridarea ; South Africa ; Stream ; Water regime
Afrique du Sud ; Cours d'eau ; Crue ; Domaine aride ; Domaine semi-aride ; Impact ; Parc national ; Précipitation ; Régime hydrique ; Sécheresse ; Variabilité climatique ; Variation saisonnière ; Végétation ripicole
Semi-arid rivers are subject to highly variable flow regimes as a result of strongly seasonal and unpredictable rainfall. Riparian landscape state changes resulting from a prolonged low flow period followed by a high magnitude flood were examined
in the semi-arid, mixed bedrock / alluvial Sabie River in the Kruger National Park. Flow reductions and increased sediment supply may result in long-term changes. - (AJC)
Domaine aride ; Domaine semi-aride ; Ganga ; Inde ; Micromorphologie ; Microtopographie ; Minéralogie ; Néotectonique ; Plaine alluviale ; Propriétés du sol ; Punjab ; Pédogenèse ; Sol salin ; Sol sodique ; Uttar Pradesh
In the northwestern part of the Indo-Gangetic Plains (IGP), India, non-sodic and moderately sodic soils occur on microhigh (MH) and highly sodic soils on microlow (ML) position under a semi-arid climate. The main soil-forming processes have been
clay illuviation, deposition of pedogenic calcium carbonate and concomitant development of sodicity. The semi-arid climate and topography interact to facilitate greater penetration of bicarbonate-rich water in microlow than microhigh positions. It seems
Simultaneous measurements of rainsplash (as a surrogate for total raindrop detachment) and erosion were made during two rainfall simulation experiments on an 18 by 29 m runoff plot located in an interrill area on a semi-arid, grassland hillslope