Gully initiation in Quaternary volcanic environments under temperate subhumid seasonal climates
Gully erosion processes occurring in a Quaternary volcanic landscape under a temperate subhumid seasonal climate are analysed. It is postulated that gullying starts as a consequence of shallow mass-movements produced by non-concentrated throughflow
Le sol : un facteur écologique déterminant en milieu tropical subhumide insulaire. L'exemple de la Guadeloupe in Climatologie tropicale et établissements humains.
Action anthropique ; Antilles ; Biosphère ; Climat tropical subhumide ; Ecologie ; Erosion ; Guadeloupe ; Géographie physique ; Humidité du sol ; Ile ; Petites Antilles ; Sol ; Sécheresse biologique ; Zone intertropicale
. Globalement, le climat a connu, de légères variations: à partir de 1917, alternance d'un climatsubhumide (au sens de Thornthwaite) et du climat subaride, connaissant une légère chute de température (un dixième de degré par siècle). On note également une chute
subhumide dans la province de Santa Fé, et le secteur du delta du Parana, de climatsubhumide. Les images Landsat donnent une information intéressante sur la tectonique et le réseau hydrographique, peu d'information directe sur la géomorphologie des aires de
Application des images satellites Landsat à la cartographie géologique. Trois secteurs argentins sont étudiés: un secteur montagneux de climat semi-aride (Sierras pampeanas de Catamarca: Ambato, Gracian y Ancasti), un secteur de plaine, de climat
Loess paleosol-sequences along climatic gradient in Northern Iran
In Northern Iran, loess is found in different geomorphological settings along a climatic gradient ranging from subhumid to semiarid conditions. Loess-paleosol sequences were investigated in detail in three key sections located on the northern
foothills of Alborz mountains and in the less hills north of Gonbad-e Kavus. The loess-paleosol sequences indicate pronounced climate changes from dry and cool to moist and warm conditions with loess deposition and soil formation, respectively
. They are excellent terrestrial archives of Quaternary climate and environment change in Northern Iran. - (IfL)
L'étude phytosociologique des formations à Juniperus phoenicea L. du littoral ouest algérien a révélé une double zonation végétale, en longitude (passage du subhumide algérois au semi-aride oranais) et en latitude (en liaison avec les embruns et la
Resource use and strategies for development of pastoral systems in subhumid West Africa. The case of Nigeria
An attempt is made here to outline the major elements of pastoral resource use in subhumid Nigeria, and to examine some development strategies against this background. (l'A)
Modélisation de la courbe interhoraire des températures hivernales à 2 440 m d'altitude, dans des climats qui vont de l'aride au subhumide. A 10 cm du sol, les minima sont presque toujours enregistrés à 6 heures locales, les maxima entre 11 et 12
Influence of climate and eolian dust on the major-element chemistry and clay mineralogy of soils in the northern Bighorn Basin, U.S.A.
The major-element and zirconium composition of the silt-plus-clay (fine) and sand fractions and the clay mineralogy of soils in three chronosequences formed under different climates (subhumid, semiarid, and arid) are used to characterize
Région granitique de climat méditerranéen subhumide et de climat méditerranéen humide dans les zones élevées de la chaîne littorale. Calcul des différents indices édaphoclimatiques. Le climat entraîne l'altération chimique des roches avec formation
, ecological conditions (probably warm subhumid with rapid cyclical climatic changes) differing from the cold and semiarid or semidesert environments of typical loess formation. The former conditions were characteristic, from the lower Pliocene to the lower
The loess of type localities is subdivided into 3 subseries on the basis of the paleosols allowing even an Eurasian comparison for their lithostratigraphy. It can be concluded that the reddish paleosol developed under climatic, and in general
La montagne moyenne de la région d'Alcoy (province d'Alicante) constituée de roches tendres, présente les conditions pluviométriques typiques du climat méditerranéen subhumide, la végétation est pauvre, ce qui explique l'importance des mouvements de
Humidity conditions in the Western Karakorum as indicated by climatic data and corresponding distribution patterns of the montane and alpine vegetation
Les études en cours sur le climat dans le Karakorum occidental permettent d'établir des gradients régionaux verticaux d'humidité, qui concordent avec les formations végétales. Quatre niveaux de végétation, en relation avec l'humidité, ont pu être
distingués: subhumide à semi-humide, semi-aride, subaride et eu-aride. - (D. Rouvière).
Geomorphic agents versus vegetation spreading as causes of badland occurrence in a Mediterranean subhumid mountainous area
The aim of this study is to discuss the mechanisms that determine the occurrence of badland forms in a subhumid mountain area in the Vallcebre area, southeastern Pyrenees, that has been subjected to detailed studies on physical weathering
Humid to arid to subhumid vegetation shift on Pilliga Sandstone, Ulungra Springs, New South Wales
Pollen analysis of spring-fed deposits gives a vegetation history extending from at least 30,000 yr B.P. to the late Holocene. This study adds a new late last-glacial record and focuses on one region where semiarid and subhumid areas meet.
The Loess Plateau-Northeastern Tibetan Plateau in China is famous for its deep and continuous distributed loess, in which soils (developed from loess) vary gradually with different biological climates changing from subhumid to arid, which provide
a natural proving ground for study the coupling of loess-paleosol and climatic changes quantitatively. 32 sections were sampled for measuring chemical element contents, clay content and 60 sections were sampled for carbonate analysis to establish transfer
functions between pedogenesis and climate. Finally, the AA. estimated the paleoclimate (P/T) in the region with transfer functions. Discussion of the results.
Geomorphological dynamics of subhumid mountain badland areas - weathering, hydrological and suspended sediment transport processes : A case study in the Araguás catchment (Central Pyrenees) and implications for altered hydroclimatic regimes
Badland ; Central Pyrenees ; Climatic change ; Mediterranean area ; Mountain ; Regolith ; Sediment transport ; Spain ; Suspended load ; Water erosion ; Watershed ; Weathering
Special issue. Geomorphic response of mediterranean and arid areas to climate change
that the climatic conditions governing sedimentation during the Holocene changed from humid and subhumid to the present subarid conditions, but was interrupted by a phase of increased humidity. The varying character of solid bedrock caused different weathering
Alluvium ; C 14 dating ; Climatic variation ; Floodplain ; Meander ; Palaeogeography ; Quaternary ; Sediment budget ; Soil ; Stratigraphy ; Texas ; United States of America
The study area lies in the subhumid Gulf Coastal Plain physiographic province of east central Texas. Specifically, geological investigations were undertaken along the 75-km segment of the floodplain between Hearne and Navasota, where the late
Quaternary history is complex. 2 major and 3 minor periods of soil formation are documented in the floodplain sequence. These changes on the floodplain appear to be the result not of a single factor, but of the complex interplay among changes in climate