Until recently only geomorphological features and mammal fossils had been known as evidence to the long-debated dry-warm semidesert or hot desert climate in the Carpathian basin following the filling up of the Pannonian Lake. A comparison of samples
with desert varnish collected NE of Budapest and near the oasis of Hassi Zegdou in Algeria support the desert theory. Desert crusts are dated with the help of bio- and lithostratigraphical and paleomagnetic dating of red clays.
Late Wisconsin macrofossil records of desert vegetation in the American Southwest
Recent discovery of macrofossil assemblages in the Mojave Desert extends the record of desert vegetation back to 14,800 yr ago and to altitudes as high as 910 m. Although xerophytic conifer woodland was widespread in current desert habitats during
the Late Wisconsin and early Holocene, the development of extensive desert vegetations was not delayed until the beginning of the middle Holocene. A regional vegetation mosaic of desert scrub and woodland existed at altitudes below 1000 m in the Mojave
Desert during the last part of the Late Wisconsin.
Zum Begriff Polare Wüste. (About the term Polar Desert)
Concept ; Désert ; Désert polaire ; Géographie des régions polaires ; Terminologie ; Zone froide
The term Polar desert is being discussed. An examination of the basic factors like climate, vegetation, weathering and erosial processes shows a distinct aridity in different parts of the polar zones. In the field of human geography there are also
some important features, typical of deserts, as for instance specific distribution of population, socioeconomic structures and economic revenues. Summing up, the polar zones are not deserts in the whole but within these zones there exist local deserts
Investigations into processes of ventifact formation in the east-central Mojave Desert confirm the importance of topography as a control in the location, orientation, and intensity of ventifact abrasion.
The A. summerizes the results of physical geographical, mainly geomorphological investigations concerning the most important desert types, on the basis of a field-work in Algeria and from the literature of the Northwest-Saharan regions visited. (CK).
L'A. constate que le désert australien est, contrairement aux idées reçues, considérablement moins aride que la plupart des déserts du monde. Le relief, la répartition saisonnière et l'oscillation des précipitations ont créé une multitude de formes
de déserts. Cette diversité est soulignée par les nombreux types de végétation. Même si la nature limite déjà elle-même son utilisation, les espaces arides, leur faune et leur flore sont en danger. - (KM)
Les déserts : exploitation rationnelle et protection
Domaine aride ; Désert ; Ecosystème ; Mise en valeur ; Paysage ; Protection de la nature ; Srednjaja Azija ; URSS d'Asie
Arid land ; Asian part of USSR ; Desert ; Ecosystem ; Land improvement ; Landscape ; Nature conservation ; Soviet Central Asia
Ouvrage destiné à ceux qui s'occupent d'amélioration et de protection de la nature. Les AA. exposent les caractéristiques des déserts, de la diversité des biogéocénoses désertiques, les paysages uniques des déserts de l'Asie Moyenne soviétique
, l'histoire et l'étape actuelle de la mise en valeur économique et de la protection des déserts. - (VVA)
Arid area ; Carbonate ; Chemical alteration ; Clay mineral ; Cold desert ; Desert ; Geochemistry ; Mineralogy ; Pedogenesis ; Salinisation ; Weathering
The mineralogy-determining processes in both hot and cold desert 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
Use of multiparameter relative-age methods for age estimation and correlation of alluvial fan surfaces on a desert piedmont, eastern Mojave Desert, California
L'A. passe en revue les thèmes suivants : les surfaces des déserts et la météorisation, processus et produits; les pentes de versants des déserts, processus morphologiques et hydrologiques; les systèmes fluviaux des déserts, fleuves et cônes de
déjection; les playas des déserts,lacs et sabkhas de playas; les environnements éoliens des déserts : reliefs, processus et sédiments.
Arid area ; Basalt ; California ; Desert ; Leaching ; Pedogenesis ; Salinisation ; Spatial distribution ; United States of America ; Vegetation
This study identifies the patterning of clast cover as the dominant control of water and sediment distribution across and into this arid landscape. The AA. have found that desert pavement surfaces are a complex association of landscape
and hydrologic elements governed by their surface characteristics. The AA. identified 6 unique surface mosaic types for a desert pavement landscape formed on a single-aged basalt flow in the Mojave Desert. They report that these surface mosaics predict
the spatial distribution of fundamental desert vegetation and soil characteristics.
Arid land ; Aridity ; Bibliography ; Climate ; Desert ; Desertification ; Ecology ; Geomorphogenesis ; Landscape ; Natural environment ; Research ; Spatial distribution ; Vegetation
Leçon inaugurale de l'enseignement de l'érémologie à l'Université de Gand. Le désert est décrit en tant qu'unité éco-climatique, avec ses aspects physiques (climat et paysages) et le monde vivant qu'il abrite, de la plante à l'homme. - (JPB)
The Chihuahuan desert shared by the USA and Mexico has been delimited in different ways depending on one's perspective of the desert as a climatic system, physiographic landform or biotic province. The A. formulates a synthesizing definition based