Trees

, Volume 28, Issue 2, pp 439–448 | Cite as

Understanding causes of tree growth response to gap formation: ∆13C-values in tree rings reveal a predominant effect of light

  • P. van der Sleen
  • C. C. Soliz-Gamboa
  • G. Helle
  • T. L. Pons
  • N. P. R. Anten
  • P. A. Zuidema
Original Paper

Abstract

Key message

Carbon isotope ratios in growth rings of a tropical tree species show that treefall gaps stimulate diameter growth mainly through changes in the availability of light and not water.

The formation of treefall gaps in closed canopy forests usually entails considerable increases in light and nutrient availability for remaining trees, as well as altered plant water availability, and is considered to play a key role in tree demography. The effects of gaps on tree growth are highly variable and while usually stimulatory they may also include growth reductions. In most studies, the causes of changes in tree growth rates after gap formation remain unknown. We used changes in carbon isotope 13C discrimination (Δ13C) in annual growth rings to understand growth responses after gap formation of Peltogyne cf. heterophylla, in a moist forest of Northern Bolivia. We compared growth and Δ13C of the 7 years before and after gap formation. Forty-two trees of different sizes were studied, half of which grew close (<10 m) to single treefall gaps (gap trees), the other half more than 40 m away from gaps (controls). We found variable responses among gap trees in growth and Δ13C. Increased growth was mainly associated with decreased Δ13C, suggesting that the growth response was driven by increased light availability, possibly in combination with improved nutrient availability. Most trees showing zero or negative growth change after gap formation had increased Δ13C, suggesting that increased water stress did not play a role, but rather that light conditions had not changed much or nutrient availability was insufficient to support increased growth. Combining growth rates with Δ13C proved to be a valuable tool to identify the causes of temporal variation in tree growth.

Keywords

Carbon stable isotopes Gap formation Tree growth Light availability Water availability Peltogyne 

Notes

Acknowledgments

We thank Carmen Bürger of GeoForschungsZentrum in Potsdam, Germany, for her help with the analysis of the wood samples, Mart Vlam for his assistance during the sampling of wood in growth rings and two anonymous reviewers for their constructive and helpful comments. Peter van der Sleen and Pieter Zuidema were supported by the European Research Council (ERC grant #242955).

Conflict of interest

Authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • P. van der Sleen
    • 1
    • 2
  • C. C. Soliz-Gamboa
    • 3
    • 6
  • G. Helle
    • 4
  • T. L. Pons
    • 5
  • N. P. R. Anten
    • 6
    • 7
  • P. A. Zuidema
    • 1
  1. 1.Forest Ecology and Forest Management, Centre for EcosystemsWageningen UniversityWageningenThe Netherlands
  2. 2.Instituto Boliviano de Investigación Forestal (IBIF)Santa Cruz de la SierraBolivia
  3. 3.Programa de Manejo de Bosques de la Amazonía Boliviana (PROMAB), Universidad Autónoma del BeniRiberaltaBolivia
  4. 4.Section 5.2 Climate Dynamics and Landscape EvolutionHelmholtz-Centre Potsdam. Deutsches GeoForschungsZentrumPotsdamGermany
  5. 5.Plant Ecophysiology, Institute of Environmental BiologyUtrecht UniversityUtrechtThe Netherlands
  6. 6.Ecology and Biodiversity, Institute of Environmental BiologyUtrecht UniversityUtrechtThe Netherlands
  7. 7.Centre for Crop Systems Analysis, Department of Plant SciencesWageningen UniversityWageningenThe Netherlands

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