Arifa Beddiar, Meriem Adouane, Imene Boudiaf, Adem Fraga

Mycorrhizal status of main spontaneous or introduced forest trees in El Tarf province (Algerian North-east)

In Algeria, often, serious imbalances of the forest ecosystems caused by the badly led exploitations, the repeated fires, the overgrazing involve the disappearance of the timbered state on vast territories. Within the framework of the plantation and restoration programs of these degraded forests, we plan to contribute to it by tests of controlled mycorrhization of forest tees in nursery. But to realize these tests, it is necessary to know beforehand the natural symbiotic status of the studied species. We present there, the first stage of our work which consisted in establishing the mycorrhizal status of main spontaneous or introduced forest species into Algerian North-east. The study was carried out in El Tarf province and related to all the species of pine, oaks and other leafy trees existing in this area. The results show that all the species observed have either ectomycorrhizas (ECM) or arbuscular endomycorrhizas (AM) or both at the same time. In addition, the introduced species of the Acacia or Casuarina genus carry AM and also nitrogen fixing nodules. It should be noted the remarkable diversity of ectomycorrhizal morphotypes associated to the pines and to the oaks and also that of the endomycorhizals fungi spores occur in the rhizosphere of other species. Lastly, it is significant to note the omnipresence of Cenococcum geophilum mycorrhiza in all the stations and the majority of the ectomycorrhizal trees

Keywords:

ectomycorrhizas, arbuscular mycorrhizas, forest species, Algerian North-east,

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