PJB-2018-355
FLORISTIC COMPOSITIONS AND PLANT COMMUNITY TYPES OF WADI WESAH, JAZAN, SAUDI ARABIA
wael
Abstract
This study was conducted on Wadi Wasah of Jazan of Saudi Arabia, A total of 96 species belonging to 78 genera and 34 families surveyed. Poaceae and Euphorbiaceae are dominant families constituted 23.0 % of the total species. Chamaephytes constituted 40 species representing 42 % richness in the wadi followed by the therophytes with 30%. the phytoclimate of the wadi thero-chameophytic type. The floristic composition of the different geomorphologic landscape units shows differences in species richness where the chorological analysis revealed 55 species (57%) are bioregional, native to the Saharo-Arabian and Sudano-Zambezian region. For community analysis, 12 community types were estimated in the wadi, the Tamarindius indica revealed as the highest community type. Similarity and dissimilarity between the different sites calculated by Sorensen’s Index coefficient (ISs) revealed the highest similarity were calculated between site no. 3 and site no. 7 (ISs= 41.1%) followed by site no. 6 and site no. 9 (ISs = 38.8 %). The lowest similarity between site no. 10 and no. 31 (4.76%). No similarity between sites no. 1 & no. 25, no. 6 & no. 21, no. 8 & no. 23, no. 16 & no. 24 and site no.15 & no. 38. Four sites of 20, 21, 22 and 23 have a special percentages comparing with other sites these sites are wetland due to rainfall sources. This current study helps to document the current plant diversity of the area and updates the known flora of Jazan region.
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