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Terre agricole --- farmland --- Dégradation du sol --- Soil degradation --- Évaluation --- evaluation --- Cartographie --- cartography --- Togo --- evaluation.

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Sol salin --- Saline soils --- Terre abandonnée --- Abandoned land --- Périmètre irrigué --- Irrigation schemes --- Bilan hydrique --- water balance --- Dégradation du sol --- Soil degradation --- Zone aride --- Arid zones --- Zone semi-aride --- Semiarid zones --- India

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Many advances have been made in our understanding of tropical geomorphology in recent decades, but the field remains relatively neglected. With current widespread concern about the damage to tropical ecosystems, it is time for a new study of geomorphology in the tropics. The author endeavours to provide a tropical perspective on geomorphology, rather than a compartmentalised "tropical" geomorphology. The importance of weathering and the materials of the weathered mantle in determining the outcome of erosional processes is emphasised. The impact of Quaternary climate changes in creating superficial forms and deposits is stressed as being fundamental in the tropics as in other parts of the world. Nevertheless, the tropical landscape exhibits forms and deposits that have evolved over long time-periods in the absence of frost and ice, justifying an evolutionary approach to the long-term development of landscape. The book is important to a broad spectrum of earth science interests including geotechnical and engineering studies, and soil science, as well as to students of geomorphology. People working in the tropics will encounter the processes and products of tropical denudation systems, and the fragile nature of many of the surface materials discussed in this volume demands a deeper understanding of their behaviour. No other book currently attempts this task and this study fills a serious gap in the literature of geomorphology.

Geomorphology --- Géomorphologie --- Zone tropicale --- Tropical zones --- Érosion --- Erosion --- Dégradation du sol --- Soil degradation --- -Geomorphic geology --- Physiography --- Physical geography --- Landforms --- Tropics --- Geografie --- Fysische geografie --- Reliëfvormen --- (fluviatiel denudatief; tropische geomorfogie; reliëfvormen ten gevolge van wind, ijs, sneeuw, vorst en karst) --- -Tropics --- (fluviatiel denudatief; tropische geomorfogie; reliëfvormen ten gevolge van wind, ijs, sneeuw, vorst en karst). --- Geomorphic geology --- Erosion. --- Geomorphology - Tropics.

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Développement rural --- Rural development --- Système de culture --- cropping systems --- Organisation socioéconomique --- socioeconomic organization --- Recherche agronomique --- Agricultural research --- Dégradation du sol --- Soil degradation --- Administration régionale --- Regional government --- Prise de décision --- Decision making --- Modèle --- Models --- Méthodologie --- methodology --- Structure agricole --- agricultural structure --- France --- Groupement d'interet general

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Désertification --- Desertification --- Politique de la recherche --- Research policies --- Utilisation des terres --- land use --- Aptitude des terres --- land suitability --- Dégradation du sol --- Soil degradation --- Lutte antiérosion --- erosion control --- Conservation des sols --- Soil conservation --- Recherche interdisciplinaire --- Interdisciplinary research --- Région méditerranéenne --- Mediterranean region --- Desertification.