Author(s): Modi Mohammed Ahmed, Ali Mohammed Al-Dousari, and Saji Baby
Article publication date: 2009-09-01
Vol. 27 No. 3 (yearly), pp. 114-126.
200
Keywords
Nabkha, Dominant plant, Morphology characteristics.
Abstract
Natural accumulation of wind-borne sediments within or around the canopies of plants
plays an important role in the ecological and evolutionary dynamics of many coastal and desert
ecosystems. The formation of such phytogenic mounds (nebkhas) creates patches that can strongly
influence the spatial distribution of plant and soil resources. Nabkhas are common, and are dunes
formed around plants. Individual plants must reach 10 - 15 cm in height before they can effectively
trap sand. The largest nabkhas accumulate around trees, and can reach 10 meters in height.
Nabkhas can be composed of sand, silt, or pelletized clay, the grains of which can be cemented by
organic materials. Once trapped in a nabkha, these cemented particles do not readily become wind
re-entrained. This paper examine some aspects of the development, morphological and ecological
characteristics of nabkhas formed around perennial dominant plant. Nabkha area develop mainly
under the control of Aeolian process. The study focused on eleven dominant plant species covered
desert of Kuwait. Each plant have special character. Cyperus, Haloxylon and Rhanterium lied in
highly degraded area. Haloxylon speciesis more efficient in trapping sand compared to other desert
plants. Astragalus sp have highest carbonate percentage of all nabkha. Citrullus sp have lowest hight
of nabkha. Sabkha plant such as Nitraria, Tamarix, Halocnemum and Salicornia have low pH and
carbonates and high in moisture content and electrical conductivity. Lycium sp is characterized
to have the longest distances between branches and plants in comparison to other plant specie.