Ecosystems

, Volume 17, Issue 3, pp 394–404

Does Drought Influence the Relationship Between Biodiversity and Ecosystem Functioning in Boreal Forests?

  • Charlotte Grossiord
  • André Granier
  • Arthur Gessler
  • Tommaso Jucker
  • Damien Bonal
Article

Abstract

In mixed forests, interactions among species influence ecosystem functioning but environmental conditions also play an important role in shaping relationships between biodiversity and ecosystem functioning. In the context of climate change, the carbon and water balance in pure versus mixed forest stands may be differentially influenced by changing soil water availability. To test this hypothesis, we compared the influence of biodiversity on stand water use efficiency (WUES) in boreal forests between wet and dry years. We assessed the carbon isotope composition (δ13C) of tree rings in Betula pendula, Pinus sylvestris, and Picea abies growing in pure versus mixed stands. In addition, we tested whether differences in WUES affected patterns of stand basal area increment (BAIS). No biodiversity effect was found for stand δ13C (δ13CS) during the wet year. However, there was a significant increase in δ13CS between the wet and the dry year and a significant effect of biodiversity on δ13CS in the dry year. The increase in δ13CS in mixed stands was associated with both selection and complementarity effects. Although BAIS decreased significantly in the dry year, changes in δ13CS did not translate into variations in BAIS along the biodiversity gradient. Our results confirmed that the physiological response of boreal forest ecosystems to changing soil water conditions is influenced by species interactions and that during dry growing seasons, species interactions in mixed stands can lead to lower soil moisture availability. This illustrates that biodiversity effects can also be negative in mixed stands in the sense that soil resources can be more intensively exhausted. Overall, our results confirm that in boreal forests, the biodiversity–ecosystem functioning relationship depends on local environmental conditions.

Keywords

biodiversity boreal forest drought δ13mixed forest water use efficiency 

Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Charlotte Grossiord
    • 1
    • 2
  • André Granier
    • 1
    • 2
  • Arthur Gessler
    • 3
    • 4
  • Tommaso Jucker
    • 5
  • Damien Bonal
    • 1
    • 2
  1. 1.INRA, UMR 1137 Ecologie et Ecophysiologie ForestièresChampenouxFrance
  2. 2.Université de Lorraine, UMR 1137 Ecologie et Ecophysiologie ForestièresVandœuvre-lès-NancyFrance
  3. 3.Leibniz Centre for Agricultural Landscape Research (ZALF)Institute for Landscape BiogeochemistryMünchebergGermany
  4. 4.Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB)BerlinGermany
  5. 5.Forest Ecology and Conservation Group, Department of Plant SciencesUniversity of CambridgeCambridgeUK

Personalised recommendations