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This paper deals with the variation patterns of the physical and chemical characteristics of soils from several soil toposequences that occur under different gradient slopes and on different parent rocks. Spatial variation of soil properties mainly depends on the composition of their cation\u2010exchange complex, as the role of other factors, such as the mineralogy of the clay fraction, were of minor importance. There is often a stronger increment of Na and\/or Mg than of Ca with depth, causing a variable degree of sodicity in some of these soils, to which waterlogging tendency of their upper horizons is related. Though the occurrence of these features is determined by the nature of the parent rock, their degree of expression varies primarily according to the topographic position of soils. Therefore, a catenary distribution including nonsodic Cambisols or Luvisols in the hillcrests and Stagnic Solonetz or Sodic Luvisols or Sodic Stagnosols in the topographic lows is common. Such soil characteristics are of utmost importance for irrigation suitability and management of these soils, and for environmental impacts assessment, as the region is vulnerable to desertification.<\/jats:p>","DOI":"10.1002\/jpln.201000056","type":"journal-article","created":{"date-parts":[[2011,10,17]],"date-time":"2011-10-17T11:26:47Z","timestamp":1318850807000},"page":"94-100","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Driving factors determining the occurrence of sodic soils in dry subhumid Mediterranean areas"],"prefix":"10.1002","volume":"175","author":[{"given":"Fernando\u00a0Manuel","family":"Monteiro","sequence":"first","affiliation":[]},{"given":"Maria\u00a0Madalena","family":"Fonseca","sequence":"additional","affiliation":[]},{"given":"Manuel\u00a0Armando","family":"Madeira","sequence":"additional","affiliation":[]},{"given":"Adrien J.","family":"Herbillon","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2011,10,17]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.3166\/ga.18.375-388"},{"key":"e_1_2_1_2_1","doi-asserted-by":"crossref","unstructured":"Blake G. 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