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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/10107

Title: Distribution and Composition of Salts in Sand Dunes Overlying Salt Flats of Coastal Desert, Saudi Arabia.
Authors: M. H. Al-Awajy
A. Al-Sheikh
M. S. Heakal
Issue Date: 1992
Abstract: Sand dunes of various shape. size, and steepness cover most of the coastal salt flats in the eastern part of Saudi Arabia. The flats arc low lying and completely unvegetated whereas the dunes success-fully support non-salt tolerant desert plants. Salinity characteristics of two dunes arc investigated in this paper. Soil profiles from salt flats, an eroded dune (E), and a growing dune (G) were described and sampled. The dunes were of similar height (65 cm) but had different slopes (0.06 for E and 0.03 for G). Dune E was more compacted and apparently older. All of the samples are dominantly sand; the acolian material probably came largely from inland deserts. The saline flats characteristically have high Cl/SO4 ( = 18.0) and low Ca/Mg ( = 0.6) equivalent ratios. Comparable values in the non-saline summits of the dunes are 0.7 and 5.9, respectively. Salts in the various layers of the sand dunes are thought to represent the extent of mixing between these two types of salts. The transfer of salts from the salt flat into the overlying G dune apparently occurred with very little mixing between the two types. In the E dune, on the other hand, apparently considerable salt mixing had occurred. Salt mixing, probably caused by diffusion. brings about hazardous salinity conditions in the older dunes.
URI: http://hdl.handle.net/123456789/10107
Appears in Collections:College of Foods And Agricultural Science

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