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How does leaf functional diversity affect the light environment in forest canopies? An in-silico biodiversity experiment

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  • Plekhanova, Elena
  • Niklaus, Pascal A.
  • Gastellu-Etchegorry, Jean-Philippe
  • Schaepman-Strub, Gabriela

Abstract

The interaction of shortwave radiation with vegetation drives basic processes of the biosphere, such as primary productivity, species interactions through light competition, and energy fluxes between the atmosphere, vegetation, and soil. Here, we aim to understand the effects of leaf functional trait diversity on canopy light absorption. We focus on the diversity of three key functional traits that influence the light-canopy interaction: leaf area index (LAI), leaf angle distribution (LAD) and leaf optical properties (LOP). We used a 3D radiative transfer model to perform an in-silico biodiversity experiment to study the effects of leaf functional diversity on a light proxy for productivity (the fraction of absorbed photosynthetically active radiation (FAPAR)) and net radiation (shortwave albedo). We found that diverse canopies had lower albedo and higher FAPAR than the average of the corresponding monoculture values. In mixtures, FAPAR was unequally re-distributed between trees with distinct traits: some plant functional types absorbed more light and some plant functional types absorbed less than in monocultures. The net biodiversity effect on absorptance was greater when combining plant functional types with more distinct leaf traits. Our results support the mechanistic understanding of overyielding effects in functionally diverse canopies and may partially explain some of the growth-promoting mechanisms in biodiversity-ecosystem functioning experiments. They can further help to account for biodiversity effects in climate models.

Suggested Citation

  • Plekhanova, Elena & Niklaus, Pascal A. & Gastellu-Etchegorry, Jean-Philippe & Schaepman-Strub, Gabriela, 2021. "How does leaf functional diversity affect the light environment in forest canopies? An in-silico biodiversity experiment," Ecological Modelling, Elsevier, vol. 440(C).
    • Handle: RePEc:eee:ecomod:v:440:y:2021:i:c:s0304380020304580
    DOI: 10.1016/j.ecolmodel.2020.109394
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    References listed on IDEAS

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    1. Bradley J. Cardinale & Diane S. Srivastava & J. Emmett Duffy & Justin P. Wright & Amy L. Downing & Mahesh Sankaran & Claire Jouseau, 2006. "Effects of biodiversity on the functioning of trophic groups and ecosystems," Nature, Nature, vol. 443(7114), pages 989-992, October.
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