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Alexandria University (1984)

Ecological Studies On Asamaralamr Plants

El Demerdash, Mohamed Abd El Aziz M.

Titre : Ecological Studies On Asamaralamr Plants

Auteur : El Demerdash, Mohamed Abd El Aziz M.

Etablissement de soutenance : Alexandria University

Grade : Doctor of Philosophy (PhD) in Botany 1984

Résumé
Most of the developing countries, and in particular arid and semi-arid regions, are facing serious economic problems. These problems may be a result of the conflict between the continuous increase in their populations on one hand and the limited natural resources and ill-advised land-use methods on the other hand. A good deal of ecological studies has there- fore been oriented towards solving these problems, and some are particularly focused towards the management of salt-affected ecosystems which occupy about 7.0% of the world surface area (Massoud 1977). Investigations on the cultivation and utilization of non-conventional crop plants (such as some of the wild plants which have an economic potentiality) under salinity and drought stresses provide evidence that such activities may be ideal management practices for such types of soils (Zahran 1982). In Egypt, there are speculations that the introduction of perennial irrigation in the Nile valley after the construction of Aswan High Dam has resulted in an increase of salinity and water logging in some areas. A survey by Raheja (1966) has shown that more than 300,000 acres have become salt-affected and some of the most valuable irrigated areas have already gone out of cultivation. Cumulative halophytes may improve such soils due to their ability to pump out salts from the soil and ground water ’through their organs. Boyko (1966) reports that each.

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