Diel and seasonal patterns of leaf gas exchange and xylem water potentials of different-sized Prunus serotina Ehrh. trees

T. S. Fredericksen, K. C. Steiner, J. M. Skelly, B. J. Joyce, T. E. Kolb, K. B. Kouterick, J. A. Ferdinand

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

Leaf gas exchange and xylem water potentials were measured in the field throughout the 1994 growing season on leaves in the upper crown of seedling, sapling, and forest canopy black cherry trees (Prunus serotina Ehrh.) in northcentral Pennsylvania. Rates of gas exchange and xylem water potentials generally decreased with increasing tree size. Rates of clark respiration also decreased with increasing tree size. Differences among tree size classes were consistent throughout the growing season for xylem water potentials, but not for leaf gas exchange measurements. In May and June, seedling net photosynthesis and stomatal conductance were approximately 2 x that of larger trees, but their values tended to be similar to or lower than those of larger trees in July and August. Averaged over the entire season, seedlings had higher leaf gas exchange rates than saplings, which had higher rates than canopy trees. Regardless of tree size, stomatal conductance and net photosynthetic rates reached a maximum near mid to late morning. Stomatal conductance and net photosynthesis decreased steadily during the afternoon for larger trees, but seedling rates remained high until late afternoon. Seedlings consistently had the highest predawn and midday xylem water potential s and leaf-to-air water vapor pressure deficits, while canopy trees had the lowest. The results of this study indicate that tree size is an important factor influencing foliar gas exchange and water relations.

Original languageEnglish (US)
Pages (from-to)359-365
Number of pages7
JournalForest Science
Volume42
Issue number3
StatePublished - Aug 1 1996

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Keywords

  • Black cherry
  • hydraulic resistance
  • net photosynthesis
  • stomatal conductance
  • vapor pressure deficit

ASJC Scopus subject areas

  • Forestry
  • Ecology
  • Ecological Modeling

Cite this

Fredericksen, T. S., Steiner, K. C., Skelly, J. M., Joyce, B. J., Kolb, T. E., Kouterick, K. B., & Ferdinand, J. A. (1996). Diel and seasonal patterns of leaf gas exchange and xylem water potentials of different-sized Prunus serotina Ehrh. trees. Forest Science, 42(3), 359-365.