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

Title data

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. Vol. 216 (2015) Issue 6 . - pp. 887-899.
ISSN 1573-5052
DOI: https://doi.org/10.1007/s11258-015-0476-6

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER128663
Institutions of the University: Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 01 Aug 2016 11:46
Last Modified: 01 Aug 2016 11:46
URI: https://eref.uni-bayreuth.de/id/eprint/33750