The mineralogy-determining processes in both hot and colddesert soils are similar. The major process is accumulation and profile redistribution of soluble salts. Release of Fe-oxides and their redistribution within the soil matrix is a minor
Soils of the hot and colddeserts show many points of similarity. Many profile features, including the development of soil horizons, the distribution and chemistry of soluble salts and the presence of desert varnish are common to the soils of both
hot and colddeserts. There are similarities in terms of weathering type, soil distribution pattern, and even ecology. The major differences between the soils of the hot and the colddesert are due to the almost complete unavailability of liquid water
Cinq années d'effort d'un groupe US-IBP Desert Biome se sont traduites par une compréhension globale du cycle de l'azote dans les écosystèmes à arbustes dominants des déserts salés dans la partie Nord-Est du Désert du Great Basin des Etats-Unis
Field experiments on physical weathering and wind erosion in an Antarctic colddesert
Antarctica ; Cold area ; Colddesert ; Freezing ; Mountain ; Salt ; Surface temperature ; Weathering ; Wind erosion ; Wind speed
Antarctique ; Désert froid ; Erosion éolienne ; Gel ; Montagne ; Météorisation ; Sel ; Température de surface ; Vitesse du vent ; Zone froide
Field experiments were carried out over a five year period with the aim of understanding contemporary weathering and erosional environments in the Sør Rondane Mountains, an Antarctic colddesert region. These include observations of 1) scaling from
Facing our present knowledges in lichenology, the subject of the article is to consider in what measure lichens reacts and adapts themselves to extreme environments in regions defined as colddeserts, on the other hand to characterize what
Antarctique ; Désert ; Désert froid ; Géochimie ; Géographie des régions polaires ; Sédimentation chimique ; Zone froide
The dry areas of the Antarctic are extreme deserts. Because of the cold they are not subjected to rainfall and geochemical separations can take place which would be destroyed by flowing water in the more temperate deserts. The distribution
Antarctica ; Australia ; Dating ; Desert ; Ice sheet ; Isotope dating ; Meteorite ; Palaeoclimate ; Quaternary ; Weathering ; Western Australia
Meteorite accumulations are found in a number of arid areas, both hot deserts and colddeserts such as the Antarctic. The AA. focus particularly on the Nullarbor Region of Western Australia. Beginning with a discussion of some basic properties
According to the field investigation, observation by an electronic microscope and x-ray identification and chemical analysis, desert-steppe migration in the Loess Plateau at about 450 kaBP was studied. The development of gypsum indicating the desert
-steppe environment, also indicates that the climate changed at 450 kaBP from monsoon climate to nonmonsoon climate in the Loess plateau, and the region was not affected by summer monsoon and was in the cold and dry environment of nonmonsoon climate
related climate changes and vegetation transitions in a cold-arid desert region of northwestern China, the western Badain Jaran desert. The orientation of a megadune's slopes appeared to greatly affect recharge variability. The near-surface peaks in NO3–N
Argile minéral ; Climat ; Concept ; Domaine aride ; Désert ; Eau du sol ; Géomorphologie climatique ; Microstructure ; Modèle ; Météorisation ; Périglaciaire ; Sol
Arid area ; Clay mineral ; Climate ; Climatic geomorphology ; Concept ; Desert ; Microstructure ; Model ; Periglacial features ; Soil ; Soil water ; Weathering
mineral boundary-layer to landscapes. Most of the examples derive from the warm and colddeserts which have provided the climatic theory with its best evidence.
Zu einigen Problemen der Städte in der peruanischen Küstenwüste in Vergangenheit und Gegenwart (Problèmes passés et présents des villes du désert côtier péruvien)
Croissance urbaine ; Désert froid ; Géographie de l'Amérique ; Habitat urbain ; Littoral ; Pérou ; Sans-abris ; Taudis ; Technique de construction
Among the problems of modern Peru there are the homelessness, slums and towngrowth without control. The region around the Peruvian capital is characterized by a cold climate with fogs and mists. Archaeological remains show that adobe construction
L'étude par la méthode de morphoscopie de grains de sable de quartz dans ce territoire montre que dans la période précédant la formation de tourbières (10 000 ans BP) il existait des espaces arides périglaciaux ressemblant à des déserts froids. Les
Aeolian dust ; Aeolian features ; Aeolian transport ; Arid area ; China ; Climatic change ; Desert ; Experimentation ; Gansu ; Human impact ; Sand ; Wind erosion
Here, the AA. show that an external dust supply is also an important dust contributor to the sand desert, and that dust emission from the sand desert will occur if an external dust supply is available and diminish if the external supply is cut off
. Their results relate the dust emission from sand deserts to an external dust supply resulting from disturbed processes or changed hydrological processes caused by climate changes or human activities, and also suggest that the dust emission rate of natural sand
deserts can actually increase with external dust supply resulting from human activities or climatic changes, rather than with wind energy alone, as is commonly perceived.
[b1] Key lab. of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute (CAREERI), CAS, Lanzhou, Chine