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Direct uptake of canopy rainwater causes turgor-driven growth spurts in the mangrove Avicennia marina
Steppe, K.; Vandegehuchte, M.W.; Van de Wal, B.A.E.; Hoste, P.; Guyot, A.; Lovelock, C.E.; Lockington, D.A. (2018). Direct uptake of canopy rainwater causes turgor-driven growth spurts in the mangrove Avicennia marina. Tree Physiology 38(7): 979-991.
In: Tree Physiology. Oxford University Press: Oxford. ISSN 0829-318X; e-ISSN 1758-4469, more
Peer reviewed article  

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Author keywords
    dendrometer; foliar absorption of intercepted rainfall; foliar wateruptake; hydraulic redistribution; mangrove; mechanistic tree modelling;sap flow; soil-plant-atmosphere continuum; stem diameter variations;turgor-driven radial stem growth

Authors  Top 
  • Steppe, K., more
  • Vandegehuchte, M.W., more
  • Van de Wal, B.A.E., more
  • Hoste, P., more
  • Guyot, A.
  • Lovelock, C.E., more
  • Lockington, D.A.

    Mangrove forests depend on a dense structure of sufficiently large trees to fulfil their essential functions as providers of food and wood for animals and people, CO2 sinks and protection from storms. Growth of these forests is known to be dependent on the salinity of soil water, but the influence of foliar uptake of rainwater as a freshwater source, additional to soil water, has hardly been investigated. Under field conditions in Australia, stem diameter variation, sap flow and stem water potential of the grey mangrove (Avicennia marina (Forssk.) Vierh.) were simultaneously measured during alternating dry and rainy periods. We found that sap flow in A. marina was reversed, from canopy to roots, during and shortly after rainfall events. Simultaneously, stem diameters rapidly increased with growth rates up to 70 μm h−1, which is about 25–75 times the normal growth rate reported in temperate trees. A mechanistic tree model was applied to provide evidence that A. marina trees take up water through their leaves, and that this water contributes to turgor-driven stem growth. Our results indicate that direct uptake of freshwater by the canopy during rainfall supports mangrove tree growth and serve as a call to consider this water uptake pathway if we aspire to correctly assess influences of changing rainfall patterns on mangrove tree growth.

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