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SUIVI A LONG-TERME DANS LA STEPPE D'ARMOISE BLANCHE (ARTEMISIA HERBA-ALBA ASSO.) DU SUD-ORANAIS (ALGERIE) : FACTEURS ET INDICATEURS DE CHANGEMENTS

Résumé : Long-term monitoring of Gray-leaved Sagebrush (Artemisia herba-alba Asso.) steppe in southern Oran Region (Algeria): factors and indicators of change. The Gray-leaved Sagebrush (Artemisia herbs Alba Asso.) steppes in the Southern Oran region in Algeria are rangelands of great pastoral interest. 40 Years long-term dynamics of these steppes has been studied since 1975 using a diachronic monitoring (i) in permanent site considering five reference years and (ii) in 30 sites in the rest of the sagebrush steppe in 1975-76 and 2013-2015. Results generally show degradation with changes in the community composition and species dominance with appearance or extension of indicator species reflecting changes in land -use and environmental conditions. The increase in ephemeral species may explain the increase in the beta diversity, while the gamma diversity decreased underlying a trend toward banalization of the plant community composition. Unlike the rest of the pre-existing sagebrush steppe, in the monitoring site, following a series of rainy years, sand which had been fixed would have played an important role in the recovery of the vegetation cover.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01518194
Contributor : Laurent Jonchère <>
Submitted on : Thursday, May 4, 2017 - 1:26:55 PM
Last modification on : Monday, April 29, 2019 - 2:30:48 PM

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  • HAL Id : hal-01518194, version 1

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Badia Lahniar-Zemiti, Ahmed Aidoud. SUIVI A LONG-TERME DANS LA STEPPE D'ARMOISE BLANCHE (ARTEMISIA HERBA-ALBA ASSO.) DU SUD-ORANAIS (ALGERIE) : FACTEURS ET INDICATEURS DE CHANGEMENTS. Revue d'Ecologie, Terre et Vie, Société nationale de protection de la nature, 2016, 71 (2), pp.168--177. ⟨hal-01518194⟩

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