TY - THES ID - 145187327 TI - Diagnostic morpho-pédologique des milieux édaphiques et des ambiances paléoclimatiques de la steppe algérienne comme base utile à la prise de décision en matière de mise en valeur, de l'aménagement du territoire et du suivi de l'environnement : Application à un transect nord-sud : Aîn Oussera - Djelfa - Laghouat - (Ghardaîa). PY - 2003 DB - UniCat KW - Steppes KW - Geomorphology KW - Soil sciences KW - soil genesis KW - land use KW - Landscape KW - Desertification. KW - Desertification KW - Palynology KW - Climatology KW - human population KW - Environmental impact KW - Algeria UR - https://www.unicat.be/uniCat?func=search&query=sysid:145187327 AB - In this work, the principles and methods of geomorphopedology used as landscape comprehension "keys", have been evaluated and implemented in order to develop and put forward an integrated cartography of the steppic environment. The observations and surveys inherent to this method highlight the relations between the landscape forms, superficial formations, correlated soils, vegetation, and farming systems developed by the local populations. This approach has proved to be extremely well suited to understanding the soil genesis and in particular the shape of the associated calcareous accumulations in function of space and in time factors. The findings of specific analyses carried out using methods and techniques of several disciplines (mineralogy, micromorphology, palynology and C14 dating) throw light on the desertification process in space and time. For instance, analysis of pollen samples on soils of terraces from the Holocene (old and recent Rharbian) to the present time, have shown the clear dominance of a tree vegetation during the Neolithic period and its gradual decline. This implies that a progressive aridification of the climate has occurred since the Neolithic period (old Rharbian). This can be considered as a primary cause of the degradation of the steppic environment, making it more sensitive to the impact of anthropic factors. ER -