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Titre : Ecological study on the Desert Shrub Ochradenus baccatus delile in Wadi Hagul, North Eastern Desert, Egypt

Auteur : Showran, Rabea Ali Mosbah.

Etablissement de soutenance : Mansoura University

Grade : Master of Science in Botany (2018)

Résumé partiel
The present work provides a detailed investigation of the floristic features, ecological features, phytochemical analysis and economic potentialities of Ochradenus baccatus (Resedaceae) growing naturally in Wadi Hagul located in the North Eastern Desert of Egypt. It aims at the following objectives : 1- Investigation of the floristic characteristics including record of the plant species, distribution pattern, life – span, life – form spectra and chorological affinities of the wild plants associated with Ochradenus baccatus community type in Wadi Hagul. 2- Quantitative analysis of vegetation structure of plant species associated with Ochradenus baccatus community in the study area in terms of spatial variations in abundance using multivariate techniques (classification and ordination). 3- Analysis of variation in soil variables to determine the main edaphic factors controlling the abundance and distribution of vegetation types associated with Ochradenus baccatus. 4- Evaluation of the economic potentialities of Ochradenus baccatus growing naturally in Wadi Hagul by investigating : a- Phytochemical analysis of the shoot system. b- Elementary analysis inducing macro and microelements. Wadi Hagul occupies an area of about 345 km2, representing about 0.15% of the total area of Eastern Desert of Egypt, and lies at the Northwestern part of Suez Gulf. Its main channel extends for a distance of 48.4 km with a width of 5-10 km and runs to south and southeast to debauch into the Gulf of Suez. Floristically, the total number of recorded plant species in the present study was 57 species belonging to 51 genera and 19 flowering families. These species were classified into 46 perennials, 9 annuals and 2 biennials. On the basis of life-form spectra, the recorded species were distinguished into 24 chamaephytes, 13 hemicryplophtes, 11 therophytes, 7 phanerophytes and 2 cryptophytes. Asteraceae includes 15 species, followed by Poacease (5 species), then Asclepiadaceas, Brassicaceae, Fabaceae and Zygophllaceae (4 species each). These six leading families were represented collectively by 37 species (64.91% of the total number of recorded species). The chorological analysis of the current study revealed that the Sahro-Sindian taxa were represented by 25 species, followed by Sudano-Zambezian 11 species, then Irano-Turanian 7 species Mediterranean 7 species, Cosmopolitan 3 species and Palaeotropical only one species.

Présentation étendue (EULC)