Vegetation and Environment of the Western Mediterranean Coastal Land of Egypt: IV. The Habitat of Non-Saline Depressions

Ayyad, M. A.

doi:10.2307/2258780

Cited by 36 publications

(16 citation statements)

References 6 publications

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“…It is found both in arid and semi-arid Mediterranean ecosystems (Margaris, 1984) and in certain regions of North Africa (Le Houerou, 1979;Naveh, 1973). These ecosystems, very often referred to as ''asphodel deserts'', are characterized as the final degradation stages in the Mediterranean regions (Ayyad, 1976;Ayyad and Hilmy, 1974;Le Houerou, 1981). According to the epics of Homerus, the souls of the dead first arrived in underground meadows (Asphodelos leimon) on which only asphodels bloomed (Odyssey,XI,539,573,XXIV,13).…”

Section: Introductionmentioning

confidence: 99%

The root-tuber anatomy of Asphodelus aestivus

Sawidis

Kalyva

Delivopoulos

2005

Flora - Morphology, Distribution, Functional Ecology of Plants

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Section: Introductionmentioning

confidence: 99%

The root-tuber anatomy of Asphodelus aestivus

Sawidis

Kalyva

Delivopoulos

2005

Flora - Morphology, Distribution, Functional Ecology of Plants

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“…Nomenclature : Bhandari, (1990) Efforts to understand desert vegetation-environment relations using classification and ordination include those in the Mojave desert (El-ghonemy et al 1980;Tueller et al 1991), the Mediterranean coastal desert of Egypt (Ayyad & E1-Ghonemy 1976;Ayyad 1976), the Australian arid zone (Coats & Kirkpatrick 1992;Ayyad & E1-Ghareeb 1972), the Negev desert (NoyMeir et al 1973;Olsvig-Whittaker et al 1983;Ward et al 1993) and the Indian desert (Kumar & Shankar 1988;Kumar 1992). Almost all these studies correlated edaphic factors, sometimes even subjectively, and to some extent climatic factors with occurrence and distribution of vegetation.…”

mentioning

confidence: 99%

Trends in structural compositional attributes of dune-interdune vegetation and their edaphic relations in the Indian desert

Kumar

1996

Vegetatio

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Vegetation of 127 sites on different aspects of dune-interdunes in the Indian Thar Desert was classified using TWINSPAN. TWINSPAN groupings of sites separated better vegetated dunes of the northeast form the poorly vegetated dunes of the northwest and the southwest. Of the different ordinations using noncentred, centred and centred and standardized principal component analysis, reciprocal averaging and detrended correspondence analysis (DCA), the site and species classes in DCA correlated well with ten edaphic and ten vegetational attributes of each site. Strong correlation of vegetation groupings with soil texture, moisture holding capacity and low correlation with pH and electrical conductivity revealed the possible importance of soil physical properties in affecting vegetation composition.The 11 species classes in TWlNSPAN were regrouped into 18 species classes in DCA, which separated highly frequent species from those of less and least frequent species. Based on dominance-diversity attributes, Calligonum polygonoides-Lasiurus sindicus was brought out as bioedaphic climax stage. Correlation of ordination scores in different site groupings with vegetational attributes showed specific trends: From the zero of x, y and z axes to their maximum, the ordination scores of grasses and browse species declined while score of spinous species increased. The sites near the origin of the x, y and z axes were therefore least degraded and those at or near the maximum of x, y & z axes were most disturbed as was confirmed by the dominance diversity trends. Thus trends of compositional and functional attributes of vegetation of sites in different groupings helped in inferring a site's degradation status.

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“…Three communities are recognized : Anabasis articulata community on more or Jess sandy soils with low content of calcium carbonate, Zygophyllum album community where the soi! content of calcium carbonate and salinity becomes lower, and Asphodelus microcarpus -Thymelaea hirsuta community of fine-textured soils (Ayyad, 1976).…”

Section: -Arid Mediterranean Coastal Ecosystemsmentioning

confidence: 97%

“…They occupy locations with varying degree of water Jogging. These depressions in elude communities dominated by Salicornia fruticosa, J uneus rigidus, Arthrocnemum glaucum, Limonium echioides, Zygophyllum album, Limoniastrum monopetalum, Aeluropus lagopoides, Salsola tetrandra, Frankenia revoluta, Atriplex halimus, Hammada scoparia, and Anabasis articulata (Ayyad andEl-Ghareeb 1972, 1974).…”

Section: -Arid Mediterranean Coastal Ecosystemsmentioning

confidence: 99%

Climatic and vegetation gradients in the Mediterranean desert of Egypt

Ayyad¹,

Abdel-Razik²,

Mehanna³

1984

Bulletin de la Société Botanique de France. Actualités Botaniqu

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Summary.-The Mediterranean desert of Egypt is distinguished here into «arid» and «hyperarid» provinces on the basis of the ratio between precipitation and potential evapotranspiration, and each is subdivided according to mean temperature of both the coldest and the hottest months. The arid provinces are :(a) the attenuated arid Mediterranean coastal belt, and (b) the accentuated arid inland province. The hyperarid provinces are :(a) with mild winter and very hot summer, (b) with mild winter and hot summer, and (c) with cool winter and hot summer. Spatial and temporal variations in elima tic elements in these provinces are provided.Local vegetational variations in each province are related to the impact of geomorphology and physiography on the local climatic and edaphic characteristics ; and the plant communities associated with these variations are listed.Résumé.-Le désert méditerranéen de l'Egypte est divisé ici entre deux catégories : provinces arides et provinces hyperarides, selon la relation qui existe entre les précipitations et l'éva-potranspiration potentielle ; chaque catégorie est subdivisée en fonction de la température moyenne des mois les plus froids et des mois les plus chauds. Les provinces arides sont :a) la ceinture côtière caractérisée par un climat méditerranéen aride atténué ; b) la province intérieure, avec un climat mé-diterranéen aride accentué. Les provinces hyperarides sont celles qui ont :a) un hiver modéré et un été très chaud ; b) un hiver modéré et un été chaud ; et c) un hiver froid et un été chaud. Les variations des éléments climatiques à travers le temps et l'espace dans ces provinces sont illustrées.Les variations dans le tapis végétal local de chaque province sont reliées à l'impact de la géomorphologie et de la physiographie sur les caractéristiques du climat local et du sol. Les communautés végétales liées à ces variations sont mentionnées.

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Vegetation and Environment of the Western Mediterranean Coastal Land of Egypt: IV. The Habitat of Non-Saline Depressions

Cited by 36 publications

References 6 publications

The root-tuber anatomy of Asphodelus aestivus

The root-tuber anatomy of Asphodelus aestivus

Trends in structural compositional attributes of dune-interdune vegetation and their edaphic relations in the Indian desert

Climatic and vegetation gradients in the Mediterranean desert of Egypt

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