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Competition along productivity gradients: news from heathlands

hal.structure.identifierInstitut Polytechnique de Bordeaux [Bordeaux INP]
dc.contributor.authorDELERUE, Florian
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorGONZALEZ, Maya
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorACHAT, David L.
hal.structure.identifierUnité Expérimentale Forêt Pierroton [UEFP]
dc.contributor.authorPUZOS, Luc
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
dc.contributor.authorAUGUSTO, Laurent
dc.date.accessioned2024-04-08T12:04:54Z
dc.date.available2024-04-08T12:04:54Z
dc.date.issued2018
dc.identifier.issn0029-8549
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/196329
dc.description.abstractEnThe importance of competition in low productive habitats is still debated. Studies which simultaneously evaluate preemption of resources and consequences for population dynamics are needed for a comprehensive view of competitive outcomes. We cultivated two emblematic species of European heathlands (Calluna vulgaris and Molinia caerulea) in a nursery for 2 years at two fertility levels, reproducing the productivity gradient found in phosphorus (P)-depleted heathlands in southwest France. The second year, we planted Ulex europaeus seedlings, a ubiquitous heathland species, under the cover of the two species to evaluate its ability to regenerate. Half of the seedlings were placed in tubes for exclusion of competitor roots. We measured the development of the competitors aboveground and belowground and their interception of resources (light, water, inorganic P). Ulex seedlings' growth and survival were also measured. Our results on resources interception were consistent with species distribution in heathlands. Molinia, which dominates rich heathlands, was the strongest competitor for light and water in the rich soil. Calluna, which dominates poor heathlands, increased its root allocation in the poor soil, decreasing water and inorganic P availability. However, the impact of total competition and root competition on Ulex seedlings decreased in the poor soil. Other mechanisms, especially decrease of water stress under neighbouring plant cover, appeared to have more influence on the seedlings' response. We found no formal contradiction between Tilman and Grime's theories. Root competition has a primary role in acquisition of soil resources in poor habitats. However, the importance of competition decreases with decreasing fertility.
dc.language.isoen
dc.publisherSpringer Verlag
dc.subjectplant–plant interactions
dc.subject.encompetition importance
dc.subject.engrime–Tilman debate
dc.subject.enresource supply pre-emption
dc.subject.enresource-ratio hypothesis
dc.title.enCompetition along productivity gradients: news from heathlands
dc.typeArticle de revue
dc.identifier.doi10.1007/s00442-018-4120-8
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences de l'environnement
bordeaux.journalOecologia
bordeaux.page219-231
bordeaux.volume187
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue1
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-02625144
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02625144v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Oecologia&rft.date=2018&rft.volume=187&rft.issue=1&rft.spage=219-231&rft.epage=219-231&rft.eissn=0029-8549&rft.issn=0029-8549&rft.au=DELERUE,%20Florian&GONZALEZ,%20Maya&ACHAT,%20David%20L.&PUZOS,%20Luc&AUGUSTO,%20Laurent&rft.genre=article


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