On coordinated development of oasis and environment in aridarea
Aridarea ; Ecosystem ; Environmental management ; Oasis ; Sustainable development ; Vulnerability ; Water resources
Domaine aride ; Développement durable ; Ecosystème ; Gestion de l'environnement ; Oasis ; Ressource en eau ; Vulnérabilité
to the development of economy and environment of oasis in aridarea should depend upon the establishment of an oasis ecological and economic system, which suits the arid environment and promotes the efficiency of resource configuration, stabilizes economic increment
This study examines relations between roughness element geometry and density, and boundary-layer winds in an area with no vegetation, as a contribution to understanding aeolian processes in rocky terrains, such as those occuring in many hyper-arid
A diverse range of approaches and techniques continues to be used to study arid geomorphic processes and landform development. As more is known about the operation of processes, interpretations of the response of landforms to climatic changes become
more reliable. This article builds on a number of recent reviews (1987-1992) of processes and landforms in arid regions and on other planets (Mars).
The background to the establishment of the Arid Ecosystems Research Centre (AERC) at the Hebrew University is presented. The general goals of the Centre are outlined as well as the need for longterm integrated research.
Control factors in the segregation of mollisols and aridisols of the semiarid-arid transition of Argentina
Agricultural land use ; Argentina ; Aridarea ; Land use ; Semi-aridarea ; Soil ; Soil properties ; Taxonomy ; Vegetation
Argentine ; Domaine aride ; Domaine semi-aride ; Propriétés du sol ; Sol ; Taxonomie ; Utilisation agricole du sol ; Utilisation du sol ; Végétation
The main objective of this research is to determine the influence of edaphic parameters and mean annual precipitation on the soil organic carbon levels in the surficial horizons of the semiarid-arid transition of Argentina, in order to establish
En milieu semi-aride, l'arbre améliore la diversité spécifique de la végétation herbacée, en modifie la composition et en accroît de 30 à 40 % la production de phytomasse. Mais dans les secteurs ouverts et pâturés, la présence de l'animal réduit
Here the AA. summarized recent advances in research on the formation, development, and sediment characteristics of nebkhas and their significance to environmental changes in arid and semiarid regions. Based on the reviews of previous studies, the AA
. suggested that research on nebkha formation can provide distinct clues about environmental changes in arid and semiarid regions; however, continued studies are needed.
[b1] Key lab. of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute (CAREERI), CAS, Lanzhou, Chine
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
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
and Holocene lava flow events in the area. The yardang development is explained by the strong unidirectional winds, the poor vegetational cover due to the aridity of the region, the available quartz sand and volcanic ash particles as abrasive agents
The aim of this paper is to report on yardangs in the Payun Matru Volcanic Field, a semiarid area east of the southern Andes mountains, and to analyse the geomorphic fators for their formation, and their relationship to the upper Pleistocene
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
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
Agriculture ; Domaine aride ; Domaine semi-aride ; Evaporation ; Humidité du sol ; Kenya ; Rendement agricole ; Ruissellement ; Technique agricole
of reduction increased with mulch application rate. Thus stones were found to be more efficient than Euphorbia as mulch for moisture conservation and crop yield enhancement under semi-arid conditions.
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)