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Plant Sociology numero 54 (1) S1

pag. 33-38: The impact rehabilitation of coastal ecosystems on floristic diversity: the case of the dunes of Korba (Tunisia)

W. Jaouadi1,2,3, K. Mechergui1 & S. Wellani4

1National Research Institute of Rural Engineering, Water and Forestry (INRGREF) Laboratory of Forest Ecology. BP. 10, Ariana, 2080, Tunisia.

2Coastal Protection and Planning Agency of Tunisia (APAL), Tunisia.

3The Sylvo-Pastoral Institute of Tabarka, 8110, Tabarka, Tunisia.

4General Directorate of Forest of Tunisia, Forest Service of Nabeul, Tunisia.

doi: 10.7338/pls2017541S1/05

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abstract

The coastal ecosystems in the Nabeul area (Cap Bon), eastern part of Tunisia, are subject for several decades to a permanent and anarchic operation that generated a sharp deterioration resulting in the reduction of the biological potential and failure of ecological and socio-economic balances. Faced with this critical situation, the services of “APAL” in Tunisia (Coastal Protection and Planning Agency of Tunisia) opted for the rehabilitation of hundreds of hectares of sand dunes to reduce the magnitude of this scourge. The rehabilitation of the dunes cords was made by utilizing the multiple technique of protection (Implanting a wooden fence to protect the dune ecosystem, using ganivelles techniques for mechanical dune stabilization, installing of pipelines flows (roads) for the passage of summer visitors and the creation of ecological tours). The aim of the present work was to evaluate the impact of using these rehabilitation techniques on floristic diversity in the dunes of Korba (Cap Bon, Tunisia). The methodological approach adopted is that of evaluating floristic biodiversity on protected dunes and other neighboring areas located outside the protected area. The phytosociological plots were sampled basing on the methods of Braun-Blanquet, including the original cover-abundance scale. Data analysis shows the beneficial effect of rehabilitation on the structure, the composition and functioning of these coastal dunes and psammophile vegetation. Indeed, the protection increased floristic richness, species diversity (as indicated by Shannon-Weaver index) and the floristic composition, particularly palatable species: Ammophila arenaria, Cynodon dactylon, Retama raetam, Thymelaea hirsuta and Euphorbia paralias. This rehabilitation technique allowed the maintenance of several species reflecting the value of these coastal dunes in terms of biodiversity

keywords

anthropogenic activities, diversity index, floristic richness, protected area