Site Overlay


Cours obligatoires. B1: 60Cr; B2: 60Cr Biodiversité et écologie (y compris stages de terrain) – [11j Travail sur le terrain] Physiologie cellulaire végétale. Les recherches relèvent principalement de la biologie et de l’écologie évolutive, Ecologie végétale et biogéochimie, Biotechnologie végétale, et Ecologie des les cours de Biologie générale, Botanique, Zoologie, Ecologie, Biologie du. Spécialisation par le choix de cours à options au sein des modules ‘Ecosystèmes ‘ (sensu lato), ‘Interactions . Laboratoire d’Ecologie Végétale et Biogéochimie.

Author: Daibar Golmaran
Country: Samoa
Language: English (Spanish)
Genre: Technology
Published (Last): 4 June 2004
Pages: 70
PDF File Size: 1.47 Mb
ePub File Size: 6.49 Mb
ISBN: 338-5-29083-733-9
Downloads: 22679
Price: Free* [*Free Regsitration Required]
Uploader: Zuran

It is populated with approximately inhabitants depending mostly on local vegetation resources.

We aimed to study the relationships between the recent changes in human activities and the level of vegetation resource so as to anticipate a possible lack of resources in an arid region confronted to recurrent droughts.

Investigations with local populations and empirical observations showed a rapid degradation of the vegetation related to human activities. Two types of effects are distinguished. First, local people increase pressure on vegetation around the villages, while evgetale intensification of irrigated agriculture threatens the level of belowground exologie resources.

Second, the peripheral urban zones have a growing negative impact on vegetation, especially on wood. In addition, an introduced species, Prosopis juliflora is expanding fast and should be regarded as an invasion process. These changes, if associated with severe droughts, could lead to a quick loss of biodiversity and vegetation resources ceologie the massif.


Co-management plans on natural resources including local inhabitants as managers should break this degradation cycle.


Especially, facilitation between plants, and related nurse effects, can be taken as a relevant tool to restore degraded ecosystems in arid environments. Kluser Tchintoulous, et F. Cugny Tchintoulous, septembre Structure des peuplements et enjeux touristiques.

La Boussole, Grenoble, France, pages. Positive associations involving Panicum turgidum Forssk. Journal of Arid Environments L’Harmattan, Paris, pages. Inclusion of facilitation into ecological theory. Trends in Ecology and Evolution Setting and achieving objectives for conserving biological diversity in arid environments.

Regional perspectives on agriculture and biodiversity in the drylands of Africa. Comparative growth, biomass production, nutrient use and soil amelioration by nitrogen-fixing tree species in semi-arid Senegal. Forest Ecology and Management Artificial forests as conservation sites for the native flora of the UAE.

Differenciation of Prosopis juliflora Sw. Land degradation in north-western Jordan: Vegetation changes in semi-arid Vsgetale shrubland, South Africa: Effects of rainfall, wild herbivores and change in land use. Climate, flora and fauna changes in the Sahara over the past million years.

Valuation of local use and dynamics of 56 woody species in the Sahel. Biodiversity and Conservation Evaluation of Meskit Prosopis juliflora pods as feed for goats. Animal Feed Science and Technology The use of a concentrate containing Meskit Dours juliflora pods and date palm by-products to replace commercial concentrate in diets of Omani sheep.


Biodiversity in arid regions: Is facilitation in arid environments the result of direct or complex interactions? Growth inhibitory alkaloids from mesquite Prosopis juliflora Sw.

Le Département de Biologie des Organismes

cojrs Flore du Sahara, 3 rd Ed. CNRS, Paris, pages. The role of nurse plants in the restoration of degraded environments. Frontiers in Ecology in the Environment 4: Les Poaceae du Niger. Integration of plant and soil characteristics and the ecological success of two Prosopis species.

Somme biological characteristics that foster the invasion of Prosopis juliflora Sw.

Sciences biologiques

Tilalt et Bouyer, P. Vivre dans les milieux fragiles: Agrandir Original jpeg, k. Agrandir Original jpeg, 68k. Table des illustrations Titre Figure 1.

Production rapide de bois.