Cycling of metals in desert soils: effects of Tamarix nilotica and inundation by lake water |
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| Authors: | M Ali M A Badri S N Moalla I D Pulford |
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| Institution: | (1) Unit for Environmental Studies and Development, South Valley University, Aswan, 81528, Egypt;(2) Department of Chemistry, South Valley University, Aswan, 81528, Egypt;(3) Department of Chemistry, Joseph Black Building, Agricultural, Food and Environmental Chemistry, University of Glasgow, Glasgow, G12 8QQ, Scotland |
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| Abstract: | Concentrations of Ca, Mg, K, Na, Cu, Zn, Al, Fe and Mn were measured in soils and in Tamarix nilotica from Wadi Allaqi on the shore of Lake Nasser in the Eastern Desert of Egypt. All of the elements were concentrated in the leaves of Tamarix relative to the stems and roots. Leaf :soil concentration ratios, used as an indicator of metal accumulation in the plant, showed high enrichment factors for Na (67.5), K (63.0) and Mg (35.0); of the trace elements measured, Zn had the highest enrichment factor (7.64). Comparison with other desert species suggested that Tamarix was exceptional only in the accumulation of sodium. Periodic inundation of the soil by Lake Nasser caused dilution and dispersion of the accumulated salts. |
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| Keywords: | cycling desert soils Egypt Lake Nasser metals nutrients salinity Tamarix |
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