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Sap Flow and Stem Respiration

  • Viviana HornaEmail author
  • Reiner Zimmermann
  • Ewald Müller
  • Pia Parolin
Chapter
Part of the Ecological Studies book series (ECOLSTUD, volume 210)

Abstract

The effects of seasonal flooding on stem xylem flow and carbon release were investigated on common tree species of the Amazonian floodplain forests locally known as Várzea. The annual flooding lasts several months, reaches five to eight meters and drives the phenology of most forest species. Leaf shedding of deciduous trees starts at the onset of flooding and new leaves are produced after the peak of flooding in July. For evergreen species leaf shedding and new leaf production occur simultaneously during flooding. It has been generally assumed that these phenology patterns are associated to physiological stress during flooding. Here the focus is on tree and species functioning during water stress by flooding. Measurements of stem xylem flux and stem carbon release were taken to monitor changes in species ecophysiological behavior during flooding.

Transpiration of deciduous trees was high and not significantly reduced by the onset of flooding as long as the main foliage was present. In contrast evergreen species had through all seasons constant sap flux rates. In comparison to other studies in tropical and temperate trees, the conductive area estimated for várzea trees is considerably smaller. As a consequence estimated annual stand transpiration was relatively low (283.5 mm).

Regarding carbon release, it was confirmed that variation in CO2 release is associated with variation in flooding. Stem- CO2 emission did not follow changes in leaf phenology but higher stem carbon release was clearly associated higher flooding. The results of this study provide evidence of tree functioning under high metabolic demand due to ambient stress caused by flooding. Future research should focus on the seasonal pattern of carbon allocation and partitioning in várzea trees in relation to species and phenological pattern.

Keywords

Deciduous Species Evergreen Species High Flooding Sapwood Area Carbon Release 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Viviana Horna
    • 1
    Email author
  • Reiner Zimmermann
    • 2
  • Ewald Müller
    • 3
    • 4
  • Pia Parolin
    • 5
  1. 1.Albrecht-von-Haller-Institut für Pflanzenwissenschaften Abteilung Ökologie und ÖkosystemforschungUniversity of GöttingenGöttingenGermany
  2. 2.Institute of Botany and Botanical Gardens (210), Forest Ecology and Remote Sensing GroupUniversity of HohenheimHohenheimGermany
  3. 3.Former researcher in the Working Group of Tropical Ecology at the Max Planck Institute for LimnologyPlönGermany
  4. 4.National Institute of Amazon Research (INPA)ManausGermany
  5. 5.Systematik der PflanzenUniversity of Hamburg, Biozentrum Klein FlottbekHamburgGermany

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