Plant and Soil

, Volume 407, Issue 1–2, pp 135–143 | Cite as

Peatland vascular plant functional types affect dissolved organic matter chemistry

  • Bjorn J. M. Robroek
  • Remy J. H. Albrecht
  • Samuel Hamard
  • Adrian Pulgarin
  • Luca Bragazza
  • Alexandre Buttler
  • Vincent EJ Jassey
Regular Article

Abstract

Background and aims

Northern peatlands are large repositories of carbon. Peatland vascular plant community composition has been functionally associated to a set of biogeochemical processes such as carbon cycling. Yet, we do not fully understand to what extent vascular plant functional types (PFTs) affect the quality of dissolved organic matter, and if there is any feedback on soil microbial activity.

Methods

Using a longer–term plant removal experiment in a boreo–nemoral peatland in Southern Sweden, we relate the dominance of different vascular plant functional types (i.e. ericoids and graminoids) to the chemistry of the dissolved organic matter (DOM) and microbial enzymatic activities (fluorescein diacetate hydrolysis, FDA).

Results

Our results show that PFTs modifies the composition of DOM moieties, with a decrease of low molecular weight organic compounds after vascular plant removal. The decrease of enzymatic activity by up to 68 % in the plant removal plots suggests a reduction in DOM mineralization in the absence of vascular plants.

Conclusions

Our results show that plant–derived low molecular organic compounds enhance peatland microbial activity, and suggest that an increase of vascular plant cover in response to climate change can potentially destabilize the OM in peatlands, leading to increased carbon losses.

Keywords

Dissolved organic matter chemistry Enzymatic activity FDA FT-IR Plant functional types Plant-soil interactions Sphagnum-dominated peatlands 

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.School of Architecture, Civil and Environmental Engineering (ENAC), Laboratory of Ecological Systems (ECOS)École Polytechnique Fédérale de Lausanne (EPFL)LausanneSwitzerland
  2. 2.WSL – Swiss Federal Institute for Forest, Snow and Landscape ResearchLausanneSwitzerland
  3. 3.Département de GéosciencesEcole Normale Supérieure de ParisParis CEDEXFrance
  4. 4.Department of Life Science and BiotechnologiesUniversity of FerraraFerraraItaly
  5. 5.University of Franche-Comté – CNRS, UMR 6249 Chrono-environnementBesançon cedexFrance

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