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Publication Type J
Authors Salama, F. M., M. M. Abd El-Ghani, S. M. El Naggar and K. A. Baayo
Title Vegetation structure and environmental gradients in the Sallum area, Egypt
Source Ecologia Mediterranea
Author Keywords Dicotyledones, Angiospermae, Spermatophyta, Plantae Angiosperms, Dicots, Plants, Spermatophytes, Vascular Plants Caryophyllaceae [25765] [Caryophyllaceae]/Dicotyledones, Angiospermae, Spermatophyta, Plantae Angiosperms, Dicots, Plants, Spermatophytes, Vascular Plants Chenopodiaceae [25795] [Chenopodiaceae] [Haloxylon salicornicum] [Anabasis articulata] [Salsola tetrandra]/Dicotyledones, Angiospermae, Spermatophyta, Plantae Angiosperms, Dicots, Plants, Spermatophytes, Vascular Plants Compositae [25840] [Asteraceae] [Fabaceae] [Poaceae] [Brassicaceae]/Monocotyledones, Angiospermae, Spermatophyta, Plantae Angiosperms, Monocots, Plants, Spermatophytes, Vascular Plants Liliaceae [25345] [Liliaceae]/Dicotyledones, Angiospermae, Spermatophyta, Plantae Angiosperms, Dicots, Plants, Spermatophytes, Vascular Plants Plumbaginaceae [26585] [Limoniastrum monopetalum]/Dicotyledones, Angiospermae, Spermatophyta, Plantae Angiosperms, Dicots, Plants, Spermatophytes, Vascular Plants Thymelaeaceae [26860] [Thymelaea hirsuta]/Dicotyledones, Angiospermae, Spermatophyta, Plantae Angiosperms, Dicots, Plants, Spermatophytes, Vascular Plants Zygophyllaceae [26955] [Zygophyllaceae]
Abstract We examined vegetation composition and its relation to environmental variables in the Sallum area along the mediterranean coastal land of Egypt. The study area lies between 25 degrees 09'-25 degrees 35'E and 31 degrees 32'-31 degrees 15' N (about 1700km(2)), and extends for about 49 km between Buqbuq and Sallum on the egyptian-libyan frontier. It is included in the semi-desert vegetation zone with an attenuated desert climate. An analysis of vegetation along environmental gradients that prevail in the study area using the relative importance values of 55 perennials in 53 stands, followed by multivariate data analysis was presented. Altogether, 111 species (75 perennials and 36 annuals) belonging to 92 genera and 34 families of the flowering plants were recorded. Asteraceae, Fabaceae, Chenopodiaceae, Poaceae, Brassicaceae, Caryophyllaceae, Liliaceae and Zygophyllaceae were the largest families, and constitute more than 64 % of the total recorded species. Therophytes and chamaephytes were the most frequent, denoting a typical desert life-form spectrum. Phytochorological analysis revealed that 45.2 % of the studied species were uniregional, of which 23 % being native to the saharo-arabian chorotype. It also showed the decrease in the numbers of the Mediterranean species and increase of the saharo-arabian species along N-S direction form the see-shore inwards till the Diffa Plateau. Classification of the vegetation was analysed using TWINSPAN technique resulted in the recognition of five vegetation groups, each of definite floristic composition and environmental characteristics, and could be linked to a specific habitat. Haloxylon salicornicum occupied the foot of the Diffa Plateau, Haloxylon salicornicum-Thymelaea hirsuta characterised the sand plains, Thymelaea hirsuta-Anabasis articulata inhabited the non-saline depressions, Haloxylon salicornicum-Atriplex portulacoides characterised the saline depressions and Salsola tetrandra-Limoniastrum monopetalum on the coastal salt marshes. Ordination techniques as DCA and CCA were used to examine the relationship between the vegetation and the studied environmental parameters: electric conductivity (EC), pH, calcium carbonate, moisture content, organic matter, silt, clay, K+, Mg++ and altitude. CCA axis 1 showed significant correlation with clay, moisture content, pH, EC, K+, and altitude, while CCA axis 2 was clearly related to pH, Mg++ and altitude. Species richness was correlated with Mg++, while Shannon index was correlated with Na+ and Mg++.
Author Address Abd El-Ghani, Monier M.; Cairo Univ, Fac Sci, Herbarium, Giza 12613, Egypt
ISSN 0153-8756
ISBN 0153-8756
Year Published 2005
Volume 31
Issue 1
Beginning Page 15-32
Unique Article Identifier BCI:BCI201200649437
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