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Traits controlling shade tolerance in tropical montane trees

Authors
  • Ntawuhiganayo, Elisée Bahati1, 2
  • Uwizeye, Félicien K1, 3
  • Zibera, Etienne1
  • Dusenge, Mirindi E1, 4
  • Ziegler, Camille5, 6, 7
  • Ntirugulirwa, Bonaventure1, 8
  • Nsabimana, Donat1
  • Wallin, Göran5
  • Uddling, Johan5
  • 1 Department of Biology, Rwanda , (Rwanda)
  • 2 World Agroforestry (ICRAF), Rwanda , (Rwanda)
  • 3 BirdLife International, Rwanda , (Rwanda)
  • 4 Department of Biology, Canada , (Canada)
  • 5 Department of Biological and Environmental Sciences, Sweden , (Sweden)
  • 6 UMR EcoFoG, France , (France)
  • 7 Université de Lorraine, France , (France)
  • 8 Rwanda Agriculture and Animal Resources Development
Type
Published Article
Journal
Tree Physiology
Publisher
Oxford University Press
Publication Date
Dec 19, 2019
Volume
40
Issue
2
Pages
183–197
Identifiers
DOI: 10.1093/treephys/tpz119
PMID: 31860725
PMCID: PMC7048680
Source
PubMed Central
Keywords
License
Unknown

Abstract

Tropical canopies are complex, with multiple canopy layers and pronounced gap dynamics contributing to their high species diversity and productivity. An important reason for this complexity is the large variation in shade tolerance among different tree species. At present, we lack a clear understanding of which plant traits control this variation, e.g., regarding the relative contributions of whole-plant versus leaf traits or structural versus physiological traits. We investigated a broad range of traits in six tropical montane rainforest tree species with different degrees of shade tolerance, grown under three different radiation regimes (under the open sky or beneath sparse or dense canopies). The two distinct shade-tolerant species had higher fractional biomass in leaves and branches while shade-intolerant species invested more into stems, and these differences were greater under low radiation. Leaf respiration and photosynthetic light compensation point did not vary with species shade tolerance, regardless of radiation regime. Leaf temperatures in open plots were markedly higher in shade-tolerant species due to their low transpiration rates and large leaf sizes. Our results suggest that interspecific variation in shade tolerance of tropical montane trees is controlled by species differences in whole-plant biomass allocation strategy rather than by difference in physiological leaf traits determining leaf carbon balance at low radiation.

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