Floristic Diversity and Vegetation-Soil Correlations in Wadi Qusai, Jazan, Saudi Arabia

Abstract

Aims: To study Floristic diversity, life-form, chorology, edaphic factors affecting the species distribution of Wadi Qusai. Study Design: Several field trips were carried out to the study area -sites soil analysis. Place and Duration of Study: Wadi Qusai -Jazan -Saudi Arabia. Methodology: Floristic composition, vegetation diversity, life form, chorology, soil analysis and cover estimation by TWINSPAN, DCA and CCA. Results: A total of 103 species belonging to 77 genera and 33 families were recorded from 20 sample sites. Poaceae, Euphorbiaceae and Amaranthaceae are the most highly represented families. Therophytes and phanerophytes are the dominant life forms. Chronological analysis revealed that biregional elements that belong to the Saharo-Arabian and the Sudano-Zambezian together have the highest share of species representing 36 species (35% of the total species). Conclusion: Five vegetation groups were recognized by TWINSPAN, DCA and CCA analysis; group A (Aloe fleurentiniorum, Cadaba glandulosa and Delonix elata) inhabiting the high wadi slope, group B (Anisotes trisulcus , Fagonia indica, Pulicaria undulata, Acacia ehrenbergiana and Panicum turgidum) was occupied the low slope and wadi terraces, group C (Ziziphus spina-christi, Abutilon pannosum and Fagonia indica) was represented the medium wadi slope, Group D

Floristic Diversity and Phytogeography of JABAL Fayfa: A Subtropical Dry Zone, South-West Saudi Arabia

“…Chorological analysis of the 341 species surveyed in the study area revealed that the biregional elements of the Saharo-Arabian/Sudano-Zambezian chorotype (35.48%) are the most dominant chorotypes, forming the major constituent (about two-thirds of the recorded plants) of the floristic structure in Jabal Fayfa. Similar results were obtained in different studies of the flora of Saudi Arabia [21,26,29,31,62,74,75]. However, the dominance of the biregional Saharo-Arabian/Sudano-Zambezian chorotype (35.48%) over the pluri-and monoregional chorotypes (19.94% and 12.32%, respectively) disagrees with the findings of [76].…”

“…In the current study, a floristic analysis of vascular plant species from the study area includes 341 species belonging to 240 genera and 70 families (Appendix A). Compared to the floristic composition of different hotspot regions in Jizan of Saudi Arabia, species numbers recorded in this study were very high [26,[29][30][31]34,54]. However, the number of species recorded in this study (341 taxa) is within the range of the flora recorded previously by [35].…”

“…It is characterized by a mosaic of environments and a variety of habitats, and harbors a rich and diverse flora [15]. Several studies on the floristic composition and vegetation diversity of different localities, including mountains, wadies, plains, and islands in the Jizan region, southwestern Saudi Arabia have been undertaken [5,[15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. However, only a few studies focused on the vascular flora and plant ecology of Jabal Fayfa [35,36].…”

Effects of Wind Erosion Control Measures on Vegetation Dynamics and Soil-Surface Materials through Field Observations and Vegetation Indices in Arid Areas, Southeastern Tunisia

“…Progressive land degradation and continuous biodiversity loss define huge challenges for healthy ecosystem functioning in many countries all over the world [1]. Climate change, drought periods, frequent extreme events, the overexploitation of natural resources, and inappropriate management measures have induced short-and long-term adverse impacts on different environmental components, namely soil fertility and plant diversity [2][3][4][5]. These impacts have commonly been observed and they have induced irreversible effects inhibiting the rehabilitation of the degraded resources and the restoration of pristine conditions.…”

“…The previous studies of land degradation assessment in the Tunisian rangelands have used (1) localized field measurements with restraint application and a limited analysis of ecosystem dynamics or (2) remote sensing data as a non-destructive solution for these limits. In the context of these shortcomings, this study aims to evaluate the wind erosion impact control measures on the degraded ecosystems of the study area (SE Tunisia) via an integrated approach that combines field measurements and remote sensing data over an extended period (2020-2023).…”