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  • selected (Western margin of the Red Basin, River Gorge Country (region between Sichuan and Tibet), the northern slope of the Tibetan plateau towards the Qaidam depression).
  • Quaternary climatic fluctuations in the southern marginal zone of the Sahara led to considerable changes in the drainage systems, due to varying intensities of aeolian and fluvial processes. By means of interpretation of satellite images, formerly
  • -) Vertisols having formed on aeolian very fine-grained sediments as well, already occur in the scope of the 300-mm-isohyetal line. Due to their water-retaining capacity, these soils provide the only locations at the agronomic dry margin where the cultivation