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Plant species from mesotrophic wetlands cause relatively high methane emissions from peat soil

Koelbener, Albert ; Ström, Lena ; Edwards, Peter ; Olde Venterink, Harry

In: Plant and Soil, 2010, vol. 326, no. 1-2, p. 147-158

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    Titre
    • Plant species from mesotrophic wetlands cause relatively high methane emissions from peat soil
    Auteur
    • Koelbener, Albert. Institute of Integrative Biology, Plant Ecology, ETH Zurich, Universitätstrasse 16, 8092, Zurich, Switzerland
    • Ström, Lena. Department of Physical Geography and Ecosystems Analysis, GeoBiosphere Science Centre, Lund University, Sölvegatan 12, 223 62, Lund, Sweden
    • Edwards, Peter. Institute of Integrative Biology, Plant Ecology, ETH Zurich, Universitätstrasse 16, 8092, Zurich, Switzerland
    • Olde Venterink, Harry. Institute of Integrative Biology, Plant Ecology, ETH Zurich, Universitätstrasse 16, 8092, Zurich, Switzerland
    Type de document
    • Postprint
    Identifiant OAI-PMH
    • oai:doc.rero.ch:311506
    Summary
    Plants can influence methane emissions from wetland ecosystems by altering its production, consumption and transport in the soil. The aim of this study was to investigate how eight vascular plant species from mesotrophic to eutrophic wetlands vary in their influence on CH4 emissions from peat cores, under low and high N supply. Additionally, we measured the production of low-molecular-weight organic acids (LOA) by the same species (also at low and high N supply), because LOA form a substrate for methanogenesis. There were considerable differences among species in their effects upon rates of CH4 emission. Six of the species (Eriophorum latifolium Hoppe, Potentilla palustris (L.) Scop., Anthoxanthum odoratum (L.) s. str., Carex rostrata Stokes, Carex elata All., Carex acutiformis Ehrh.) increased CH4 emissions up to five times compared to control peat cores without plants, whereas two species (Phalaris arundinacea L., Phragmites australis (Cav.) Trin. ex Steud.) had no effect. There was a weak negative correlation between plant biomass and CH4 emission. N addition had no significant general effect upon CH4 emission. LOA production varied considerably among species, and tended to be highest for species from mesotrophic habitats. LOA production was stimulated by N addition. We conclude that some species from mesotrophic wetlands tend to cause higher CH4 emissions than species from eutrophic wetlands. This pattern, which contradicts what is often mentioned in literature, may be explained by the higher LOA production rates of species adapted to less productive habitats