Ecosystems

pp 1–15

Short- and Long-term Influence of Litter Quality and Quantity on Simulated Heterotrophic Soil Respiration in a Lowland Tropical Forest

  • Laëtitia Bréchet
  • Valérie Le Dantec
  • Stéphane Ponton
  • Jean-Yves Goret
  • Emma Sayer
  • Damien Bonal
  • Vincent Freycon
  • Jacques Roy
  • Daniel Epron
Article

DOI: 10.1007/s10021-016-0104-x

Cite this article as:
Bréchet, L., Le Dantec, V., Ponton, S. et al. Ecosystems (2017). doi:10.1007/s10021-016-0104-x
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Abstract

Heterotrophic soil respiration (SRH) alone can contribute up to 50% of total ecosystem respiration in tropical forests. Whereas the abiotic controls of SRH have been extensively studied, the influence of plant traits is less well characterised. We used field experiments and a modelling approach to test the relative influence of plant traits on SRH in lowland tropical forest in French Guiana. We measured leaf- and root litter traits for five common tree species and conducted a root decomposition experiment to evaluate the influence of root chemistry on decay rates. We measured SRH in trenched plots and used our field measurements to parameterize and test the Century model of soil C dynamics. Overall, the Century model performed well in simulating SRH, and species-specific root decomposition in Century corresponded well to decomposition rates measured in situ. Root litter characterized by low lignin-to-nitrogen ratios decomposed more rapidly than low-quality root litter during the first 6 months. Model runs over different time scales revealed that litter quality substantially influenced SRH on an annual time-scale by determining the rates of root- and leaf litter decomposition. However, litter mass had an overriding influence on SRH over the longer term in 20-year model runs. Synthesis Using simple plant trait data to parameterise the Century model, we were able to accurately simulate changes in SRH in a lowland tropical forest. Our results suggest that this approach could be used to predict changes in tropical soil C dynamics under global change scenarios by including data on changes in plant productivity and C inputs to the soil (for example litterfall and root turnover).

Keywords

Century model decomposition leaf litter fine roots heterotrophic soil respiration sensitivity analysis soil carbon dynamics plant traits 

Supplementary material

10021_2016_104_MOESM1_ESM.docx (15.2 mb)
Supplementary material 1 (DOCX 15,535 kb)

Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • Laëtitia Bréchet
    • 1
    • 2
  • Valérie Le Dantec
    • 3
  • Stéphane Ponton
    • 4
    • 5
  • Jean-Yves Goret
    • 2
  • Emma Sayer
    • 6
    • 7
    • 8
  • Damien Bonal
    • 4
    • 5
  • Vincent Freycon
    • 9
  • Jacques Roy
    • 10
    • 11
  • Daniel Epron
    • 4
    • 5
  1. 1.Department of Lancaster Environment CentreLancaster UniversityLancasterUK
  2. 2.INRA, UMR 0745Ecologie des Forêts de Guyane, Campus AgronomiqueKourou cedexFrench Guiana
  3. 3.Toulouse III, Université Paul Sabatier, UMR 5126Centre d’Etudes Spatiales de la BiosphèreToulouseFrance
  4. 4.INRA, UMR 1137, Ecologie et Ecophysiologie ForestièresCentre de NancyChampenouxFrance
  5. 5.UMR 1137, Ecologie et Ecophysiologie Forestières, Faculté des SciencesUniversité de LorraineVandoeuvre-les-NancyFrance
  6. 6.Lancaster Environment CentreLancaster UniversityLancasterUK
  7. 7.Smithsonian Tropical Research InstituteBalboa, Ancon, PanamaRepublic of Panama
  8. 8.Department of Environment, Earth and EcosystemsThe Open UniversityMilton KeynesUK
  9. 9.CIRAD, UPR Forêts et sociétésCampus International de BaillarguetMontpellier Cedex 5France
  10. 10.CNRS, UMR 5175Centre d’Ecologie Fonctionnelle et EvolutiveMontpellier Cedex 5France
  11. 11.CNRS, UPS 3248Ecotron Européen de MontpellierMontferrier-sur-LezFrance

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