Abstract
Plant–plant interactions are key drivers of treeline dynamics. At the Pyrenean treeline, the dwarf shrub Vaccinium myrtillus grows in pure stands or in mixed stands with Vaccinium uliginosum or Rhododendron ferrugineum. They form sparse shrub patches that colonize subalpine grasslands, having dramatic impacts on their structure and functioning. We investigated the role of the two co-occurring shrubs as possible modulators of the structure and performance of V. myrtillus in the Central Pyrenees. We analysed biomass, growth, functional parameters, age distribution, N and C concentrations and isotope compositions (δ15N and δ 13C) of V. myrtillus ramets in pure stands, and stands mixed with V. uliginosum or R. ferrugineum. Volume, above-ground biomass and age of the ramets did not differ between stand types. We found lower δ13C values, indicative of lower water-use efficiency (WUE), in leaves and shoots of V. myrtillus in stands with R. ferrugineum than in pure stands. The N content and δ15N of V. myrtillus leaves and shoots in pure stands were higher than in mixed stands, pointing to a competition for N in mixed stands. Our results indicate that V. myrtillus competes for nutrients with its neighbours, but neither this competition nor the lower WUE affect its above-ground performance. Therefore, the interaction with co-occurring shrubs does not have a major effect on V. myrtillus structure and functioning at treeline and, consequently, should not be considered as a key driver on the dynamics of this species in the encroachment of subalpine grasslands.
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Abbreviations
- IRMS:
-
Isotope ratio mass spectrometry
- SPA:
-
Shoot photosynthetic area
- TOM:
-
Total organic matter
- δ13C:
-
Carbon isotope composition
- δ15N:
-
Nitrogen isotope composition
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We are especially grateful to Empar Carrillo, Oriol Grau, Marc Talavera, Claudia Arias and Elena Sánchez for their field and laboratory assistance, and to CCiT of the University of Barcelona for the use of their facilities and their technical assistance. We also thank Jonathan Mitchley for his comments and corrections in an early version of this work, Emilia Gutiérrez for the use of the sledge microtome and Fritz Schweingruber for his support in the research of bibliographical resources. AAR was funded by a grant provided by the Fundació Agustí Pedro i Pons and an FPU grant (Ministerio de Educación, Cultura y Deporte, Spain), and SP was funded by a Ramón y Cajal contract (RYC-2013-14164, Ministerio de Economía y Competitividad, Spain). This work has been partly funded by Conselh Generau d’Aran, the European Research Project OPTIMA and the projects CGL2011-26654 (Ministerio de Ciencia e Innovación, Spain) and ARBALMONT/786-2012 (Organismo Autónomo de Parques Nacionales, Ministerio de Agricultura, Alimentación y Medio Ambiente, Spain).
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Anadon-Rosell, A., Palacio, S., Nogués, S. et al. Vaccinium myrtillus stands show similar structure and functioning under different scenarios of coexistence at the Pyrenean treeline. Plant Ecol 217, 1115–1128 (2016). https://doi.org/10.1007/s11258-016-0637-2
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DOI: https://doi.org/10.1007/s11258-016-0637-2