The hydraulic efficiency–safety trade-off differs between lianas and trees

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  • Masha T. van der Sande
    Department of Community Ecology, Helmholtz Centre for Environmental Research – UFZGerman Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-LeipzigForest Ecology and Forest Management Group, Centre for Ecosystem Studies, Wageningen UniversityInstitute for Biodiversity & Ecosystem Dynamics, University of Amsterdam
  • Lourens Poorter
    Forest Ecology and Forest Management Group, Centre for Ecosystem Studies, Wageningen University
  • Stefan A. Schnitzer
    Department of Biological Sciences, Marquette UniversitySmithsonian Tropical Research Institute
  • Bettina M. J. Engelbrecht
    Bayreuth Center of Ecology and Environmental Research (BayCEER)Smithsonian Tropical Research Institute
  • Lars Markesteijn
    Smithsonian Tropical Research Institute
Hydraulic traits are important for woody plant functioning and distribution. Associations among hydraulic traits, other leaf and stem traits, and species’ performance are relatively well understood for trees, but remain poorly studied for lianas. We evaluated the coordination among hydraulic efficiency (i.e. maximum hydraulic conductivity), hydraulic safety (i.e. cavitation resistance), a suite of 8 morphological and physiological traits, and species’ abundances for saplings of 24 liana species and 27 tree species in wet tropical forests in Panama. Trees showed a strong trade-off between hydraulic efficiency and hydraulic safety, whereas efficiency and safety were decoupled in lianas. Hydraulic efficiency was strongly and similarly correlated with acquisitive traits for lianas and trees (e.g. positively with gas exchange rates and negatively with wood density). Hydraulic safety, however, showed no correlations with other traits in lianas, but with several in trees (e.g. positively with leaf dry matter content and wood density and negatively with gas exchange rates), indicating that in lianas hydraulic efficiency is an anchor trait because is correlated with many other traits, while in trees both efficiency and safety are anchor traits. Traits related to shade- tolerance (e.g. low specific leaf area and high wood density) were associated with high local tree sapling abundance, but not with liana abundance. Our results suggest that different, yet unknown mechanisms determine hydraulic safety and local-scale abundance for lianas compared to trees. For trees, the trade-off between efficiency and safety will provide less possibilities for ecological strategies. For lianas, however, the uncoupling of efficiency and safety could allow them to have high hydraulic efficiency, and hence high growth rates, without compromising resistance to cavitation under drought, thus allowing them to thrive and outperform trees under drier conditions.
Iaith wreiddiolSaesneg
CyfnodolynEcology
Dyddiad ar-lein cynnar24 Chwef 2019
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - Mai 2019

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