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. 2010 Apr;17(2):119-28.
doi: 10.1016/j.sjbs.2010.02.004. Epub 2010 Feb 13.

Floristic composition and vegetation analysis in Hail region north of central Saudi Arabia

Wafaa M El-Ghanim  1 , Loutfy M Hassan, Tarek M Galal, Abdelfattah Badr
Affiliations

Floristic composition and vegetation analysis in Hail region north of central Saudi Arabia

Wafaa M El-Ghanim et al. Saudi J Biol Sci. 2010 Apr.

Abstract

In this study, 19 sites representing different habitats in Hail region were regularly visited for two years, in each site 2-5 stands were selected for investigating floristic composition and vegetation types in the area. A total of 124 species representing 34 families were recorded. The family Asteraceae is represented by the highest number of species (21 species) followed by the Poaceae (17 species) and the Brassicaceae (10 species) whereas, 15 families including Acanthaceae, Convolvulaceae, Moraceae, Nyctaginaceae and Primulaceae, are represented by a single species each. Chronological analysis of the vegetation in the area revealed the domination of Saharo-Sindian elements in the wild vegetations and of weedy species in the cultivated plots. Therophytes and chamaephytes are the dominating life forms of the vegetation spectra; therophytes represent 49.20% and chamaephytes represent 29.00% of the total species in the study area. Application of TWINISPAN and DECORANA classification and ordination techniques to the data produced seven vegetation groups. Ruderal habitats comprised two small groups A and F dominated by Phragmites australis and Imperata cylindrical (A), Euphorbia peplus and Sisymbrium irio (F), respectively. Two vegetation groups (B and G) have been recognized in the mountains and slopes dominated by Launaea mucronata, Trigonella stellata (B) and Ficus palmate and Fagonia bruguieri (G). Other two groups (C and E) inhabit the desert and mountainous wadies; these are represented by Gymnocarpos decandrus and Ochradenus baccatus (C) and Senecio glaucus subsp. coronopifolius and Rumex equisetiforme (E). On the other hand, one group (D) inhabits the cultivated plots and is represented by Plantago albicans and Rumex vesicarius, the last group also includes species restricted to the sand dune habitat of the Al-Nafud desert north of Hail city and represented by Calligonum polygonoides and Halyxolon salicornicum. The vegetation analysis indicated the invasion of Hail Flora by some foreign weeds such as Solanum nigrum, Lactuca serriola and Amaranthus lividus. The presence of these weeds points out the need to monitor the vegetation change in Hail region, and also other regions of Saudi Arabia, in order to elucidate the human impact on the wild plants diversity as human activities change with the fast development in the kingdom.

Keywords: Desert; Floristic composition; Hail region; Saudi Arabia; Vegetation analysis.

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Figures

Figure 1
Figure 1
Map of Saudi Arabia showing Hail region (A) and the sampled sites in the study area oh Hail Province (B). Adapted from Al-Turki and Al-Olayan (2003).
Figure 2
Figure 2
The dendrogram illustrating the presence of seven vegetation groups using TWINSPAN analysis of 57 sampled stands in the study area.
Figure 3
Figure 3
DCA ordination of the seven vegetation groups identified using TWINSPAN analysis of the 57 sampled stands in the study area.
Figure 4
Figure 4
Histogram illustrating the recurrence index distribution of the species collected from the different habitats in the study area of Hail region.
See this image and copyright information in PMC

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