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Ecosystems

, Volume 21, Issue 8, pp 1580–1592 | Cite as

Long-Term Climate Regime Modulates the Impact of Short-Term Climate Variability on Decomposition in Alpine Grassland Soils

  • Inge H. J. AlthuizenEmail author
  • Hanna Lee
  • Judith M. Sarneel
  • Vigdis Vandvik
Article
  • 502 Downloads

Abstract

Decomposition of plant litter is an important process in the terrestrial carbon cycle and makes up approximately 70% of the global carbon flux from soils to the atmosphere. Climate change is expected to have significant direct and indirect effects on the litter decomposition processes at various timescales. Using the TeaBag Index, we investigated the impact on decomposition of short-term direct effects of temperature and precipitation by comparing temporal variability over years, versus long-term climate impacts that incorporate indirect effects mediated through environmental changes by comparing sites along climatic gradients. We measured the initial decomposition rate (k) and the stabilization factor (S; amount of labile litter stabilizing) across a climate grid combining three levels of summer temperature (6.5–10.5°C) with four levels of annual precipitation (600–2700 mm) in three summers with varying temperature and precipitation. Several (a)biotic factors were measured to characterize environmental differences between sites. Increased temperatures enhanced k, whereas increased precipitation decreased k across years and climatic regimes. In contrast, S showed diverse responses to annual changes in temperature and precipitation between climate regimes. Stabilization of labile litter fractions increased with temperature only in boreal and sub-alpine sites, while it decreased with increasing precipitation only in sub-alpine and alpine sites. Environmental factors such as soil pH, soil C/N, litter C/N, and plant diversity that are associated with long-term climate variation modulate the response of k and S. This highlights the importance of long-term climate in shaping the environmental conditions that influences the response of decomposition processes to climate change.

Keywords

decomposition climate change temperature precipitation litter bag annual variability grassland tea bag index 

Notes

Acknowledgements

We thank the Research Council of Norway for funding this study as part of the FunCaB project (KLIMAFORSK Grant No. 244525) and Olaf Grolle Olsens legat for additional funding to I. Althuizen. J. Sarneel conducted the work within the Strategic theme Sustainability of Utrecht University, sub-theme Water, Climate, and Ecosystems, and was funded by the Swedish research council VR, and received a travel grant from the Stiftelsen Margit Althins Stipendie-fond. Richard J. Telford gave statistical guidance. Serge Farinas provided data on nitrogen availability and Francesca Jaroszynska on plant diversity. Linn Krüger, Pascale Michel, Ida Westman, Erik Herberg, Ruth de Groot and Tabea Galusser assisted in the field and laboratory. We also thank the land owners for permission to use their land.

Supplementary material

10021_2018_241_MOESM1_ESM.docx (148 kb)
Supplementary material 1 (DOCX 149 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Inge H. J. Althuizen
    • 1
    Email author
  • Hanna Lee
    • 2
  • Judith M. Sarneel
    • 3
    • 4
  • Vigdis Vandvik
    • 1
  1. 1.Department of Biological Sciences and Bjerknes Centre for Climate ResearchUniversity of BergenBergenNorway
  2. 2.Uni Research ClimateBjerknes Centre for Climate ResearchBergenNorway
  3. 3.Department of Ecology and Environmental SciencesUmeå UniversityUmeåSweden
  4. 4.Ecology and Biodiversity Group and Plant Ecophysiology GroupUtrecht UniversityUtrechtThe Netherlands

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