Aquisalid and landscape AE
A soil profile and landscape of a Aquisalid from the United Arab Emirates. AD143 Petrogypsic Aquisalids (UAEKST, Fig. 5.17)
For more information about soil classification in the UAE, visit:
vdocument.in/united-arab-emirates-keys-to-soil-taxonomy.h...
Aquisalids are the salty soils in wet areas in the deserts where capillary rise and evaporation of water concentrate the salts near the surface. Some of these soils have redoximorphic depletions and concentrations. In other soils redoximorphic features may not be evident because of a high pH and the associated low redox potential, which inhibit iron and manganese reduction. These soils occur dominantly in depressional areas where ground water saturates the soils at least part of the year. The vegetation on these soils generally is sparse, consisting of salt-tolerant shrubs, grasses, and forbs. Although these soils may hold water at a tension less than 1500 kPa, the dissolved salt content makes the soils physiologically dry.
Petrogypsic Aquisalids are the other Aquisalids that have a petrogypsic horizon with its upper boundary within 100 cm of the soil surface.
Petrogypsic horizons are an illuvial horizon, 10 cm or more thick, in which secondary gypsum has accumulated to the extent that the horizon is cemented or indurated (photo 26). Dry fragments do not slake in water, and roots cannot enter, except in vertical fractures that have a horizontal spacing of 10 cm or more. The minimum gypsum content is 5 percent, and the product of the thickness, in cm, multiplied by the gypsum content percentage is 150 or more. Commonly, the gypsum content is far greater than the minimum requirements. In many pedons it is 60 percent or more. Petrogypsic horizons are known to occur only in arid regions and develop in parent materials that are rich in gypsum. They are rare in the United States but are common in parts of Africa and Asia
For more information about soil classification in the UAE, visit:
vdocument.in/united-arab-emirates-keys-to-soil-taxonomy.h...
Aquisalid and landscape AE
A soil profile and landscape of a Aquisalid from the United Arab Emirates. AD143 Petrogypsic Aquisalids (UAEKST, Fig. 5.17)
For more information about soil classification in the UAE, visit:
vdocument.in/united-arab-emirates-keys-to-soil-taxonomy.h...
Aquisalids are the salty soils in wet areas in the deserts where capillary rise and evaporation of water concentrate the salts near the surface. Some of these soils have redoximorphic depletions and concentrations. In other soils redoximorphic features may not be evident because of a high pH and the associated low redox potential, which inhibit iron and manganese reduction. These soils occur dominantly in depressional areas where ground water saturates the soils at least part of the year. The vegetation on these soils generally is sparse, consisting of salt-tolerant shrubs, grasses, and forbs. Although these soils may hold water at a tension less than 1500 kPa, the dissolved salt content makes the soils physiologically dry.
Petrogypsic Aquisalids are the other Aquisalids that have a petrogypsic horizon with its upper boundary within 100 cm of the soil surface.
Petrogypsic horizons are an illuvial horizon, 10 cm or more thick, in which secondary gypsum has accumulated to the extent that the horizon is cemented or indurated (photo 26). Dry fragments do not slake in water, and roots cannot enter, except in vertical fractures that have a horizontal spacing of 10 cm or more. The minimum gypsum content is 5 percent, and the product of the thickness, in cm, multiplied by the gypsum content percentage is 150 or more. Commonly, the gypsum content is far greater than the minimum requirements. In many pedons it is 60 percent or more. Petrogypsic horizons are known to occur only in arid regions and develop in parent materials that are rich in gypsum. They are rare in the United States but are common in parts of Africa and Asia
For more information about soil classification in the UAE, visit:
vdocument.in/united-arab-emirates-keys-to-soil-taxonomy.h...