Seed bank and seed rain studies in tropical grasslands and mediterranean ecosystems: lessons learnt for restoration

Études de la banque de graines et de la pluie de graines dans les pelouses tropicales et méditerranéenne: apport pour la restauration

Buisson, E. ; Jardim Arruda, A. ; Jaunatre, R. ; Le Stradic, S. ; Muller, I. ; Yavercovski, N. ; Willm, L. ; Dutoit, T. ; Mesléard, F. ; Silveira, F.A.O.

Type de document
Communication scientifique sans actes
Langue
Anglais
Affiliation de l'auteur
AVIGNON UNIVERSITE AIX MARSEILLE UNIVERSITE CNRS IRD UMR 7263 IMBE MARSEILLE FRA ; UNIVERSIDADE FEDERAL DE MINAS GERAIS DEPARTAMENTO DE BOTANICA BELO HORIZONTE BRA ; IRSTEA GRENOBLE UR EMGR FRA ; AVIGNON UNIVERSITE AIX MARSEILLE UNIVERSITE CNRS IRD UMR 7263 IMBE MARSEILLE FRA ; AGROCAMPUS OUEST INRA UMR 0985 ESE ECOLOGIE ET SANTE DES ECOSYSTEMES RENNES FRA ; LA TOUR DU VALAT INSTITUT DE RECHERCHE POUR LA CONSERVATION DES ZONES HUMIDES MEDITERRANEENNES ARLES FRA ; LA TOUR DU VALAT INSTITUT DE RECHERCHE POUR LA CONSERVATION DES ZONES HUMIDES MEDITERRANEENNES ARLES FRA ; AVIGNON UNIVERSITE AIX MARSEILLE UNIVERSITE CNRS IRD UMR 7263 IMBE MARSEILLE FRA ; LA TOUR DU VALAT INSTITUT DE RECHERCHE POUR LA CONSERVATION DES ZONES HUMIDES MEDITERRANEENNES ARLES FRA ; UNIVERSIDADE FEDERAL DE MINAS GERAIS DEPARTAMENTO DE BOTANICA BELO HORIZONTE BRA
Année
2016
Résumé / Abstract
Plant community assembly on recently degraded or newly restored ecosystem can be described through the hierarchical filter model. Understanding the functioning of key filters (dispersal, abiotic and biotic filters) is a major prerequisite for successful restoration. The model includes a global species pool, divided in the internal species pool already present on site (i.e. seed bank) and the external species pool, which may disperse to the site (i.e. seed rain). Seed bank studies are thus carried out to identify the resilience potential on degraded sites and topsoil transfer potential efficacy. However, because of scale issues (differences between sampling methods and size of seed bank studies vs. large scale restoration) and of differences in growing conditions (greenhouse studies vs. on-site), seed bank studies can be misleading for restoration. We show examples of reference ecosystem seed bank found to be scarce and poor in target species (4 sp. on average; mainly Brachypodium distachyon and Poa bulbosa) while topsoil transfer allowed the transfer of ca. 60 species / 4 m². Seed rain studies are complementary to seed bank studies to identify resilience issues. Sites with rare seedling establishment and virtually inexistent seed banks can be considered as requiring propagule reintroduction to promote their restoration. If seed rain studies show that some seeds are transported to these degraded sites, the restoration process should then not only focus on propagule reintroduction but mainly on germination and establishment as crucial filters.
Congrès
10th SER European Conference on Ecological Restoration: Best Practices in Restoration, 22/08/2016 - 26/08/2016, Freising, DEU

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