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Role of mycorrhization and nutrient availability in competitive interactions between the grassland species Plantago lanceolata and Hieracium pilosella

Titelangaben

Höpfner, Ingo ; Beyschlag, Wolfram ; Bartelheimer, Maik ; Werner, Christiane ; Unger, Stephan:
Role of mycorrhization and nutrient availability in competitive interactions between the grassland species Plantago lanceolata and Hieracium pilosella.
In: Plant Ecology. Bd. 216 (2015) Heft 6 . - S. 887-899.
ISSN 1573-5052
DOI: https://doi.org/10.1007/s11258-015-0476-6

Abstract

Arbuscular mycorrhizal fungi (AMF) mayserve as an effective substitute for root surface. Asmycorrhizal benefits are related to nutrient availability,the trade-off between carbon investments intoAMF versus roots may drive competitive interactions.We studied competitive interactions between mycorrhizaland non-mycorrhizal individuals of Hieraciumpilosella L. and Plantago lanceolata L., speciesdiffering in both mycotrophic degree and carbonallocation to roots. Three fertilization treatments wereused to simulate nutritional differences over the courseof succession. Species-specific differences in mycotrophywere reflected in markedly larger root/shootallocation in P. lanceolata and higher mycorrhizalgrowth dependency in H. pilosella. P. lanceolatadominated competition in all fertilizer treatments,enabled by its comparatively larger root biomassallocation. In contrast, under intermediate and highfertilization, H. pilosella exhibited large investmentsinto clonal shoot growth rather than in roots. Unexpectedly,the competitive imbalance between bothspecies was amplified by the presence of AMF. Thepoor competitive strength of H. pilosella indicates thatAMF-dominated foraging can be less effective thanroot-dominated foraging in competitive interactions,particularly under high nutrient availabilities. However,the competitive imbalance was reduced in favorof H. pilosella under nutrient deficiency. Our resultslend support to the idea of differing competitivesuccess of mycorrhizal- versus root-based foragingstrategy over a nutritional gradient, which may play arole in the natural distribution of species over thecourse of succession.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER128663
Institutionen der Universität: Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 01 Aug 2016 11:46
Letzte Änderung: 01 Aug 2016 11:46
URI: https://eref.uni-bayreuth.de/id/eprint/33750