Dynamic variation in sapwood specific conductivity in six wood species Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/1544bt001

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Our goals were to quantify how non-embolisminducing pressure gradients influence trunk sapwood specific conductivity (ks) and to compare the impacts of constant and varying pressure gradients on ks with KCl andH2Oas the perfusion solutions. We studied six woody species (three conifers and three angiosperms) which varied in pit membrane structure, pit size and frequency of axial water transport across pits (long versus short conduits). Both stepwise (“steady”) and nonlinear continuous (“non-steady”) decreases in the pressure gradient led to decreased ks in all species but white oak (Quercus garryana Dougl. ex Hook), a ring-porous and longvesseled angiosperm. In one diffuse-porous angiosperm (red alder, Alnus rubra Bong.) and two conifers (western red cedar, Thuja plicata Donn. ex D. Don, and Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco), kswas 10–30% higher under steady pressure gradients than under non-steady pressure gradients, and a decrease in the pressure gradient from 0.15 to 0.01 MPa m–1 caused a 20–42% decrease in ks. In another diffuse-porous angiosperm (maple, Acer macrophyllum Pursh) and in a third coniferous species (western hemlock, Tsuga heterophylla (Raf.) Sarg), there was no difference between ks measured under steady and non-steady pressure gradients.With the exception of western red cedar, a conifer with simple pit membranes, the differences in ks between low and high pressure gradients tended to be lower in the conifers than in the diffuse-porous angiosperms. In Douglas-fir, western red cedar and the diffuse- porous angiosperms, ks was higher when measured with KCl than withH2O. In white oak, there were no differences in ks whether measured under steady or non-steady pressure gradients, or when xylem was perfused with KCl or H2O. The species differences in the behavior of ks suggest that elasticity of the pit membrane was the main factor causing ks to be disproportionate to the pressure gradient and to the different pressure regimes. The results imply that, if nonlinearities in pressure– flux relationships are ignored when modeling tree water relations in vivo, large errors will result in the predictions of treewater status and its impact on stomatal control of transpiration and photosynthesis.
Resource Type
Date Available
Date Issued
Citation
  • Domec, J-C., F. C. Meinzer, B. Lachenbruch, and J. Housset. 2007. Dynamic variation in sapwood specific conductivity in six woody species. Tree Physiology 27:1389-1400
Academic Affiliation
Keyword
Rights Statement
Publisher
Language
Replaces
Additional Information
  • description.provenance : Submitted by Barbara Lachenbruch (barb.lachenbruch@oregonstate.edu) on 2010-09-29T03:22:48Z No. of bitstreams: 1 Domec_07_Dynamic_TreePhysPNW.pdf: 2049867 bytes, checksum: 3795ac8d42faebe8c0948c4675933f15 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2010-09-29T15:04:07Z (GMT) No. of bitstreams: 1 Domec_07_Dynamic_TreePhysPNW.pdf: 2049867 bytes, checksum: 3795ac8d42faebe8c0948c4675933f15 (MD5)
  • description.provenance : Made available in DSpace on 2010-09-29T15:04:07Z (GMT). No. of bitstreams: 1 Domec_07_Dynamic_TreePhysPNW.pdf: 2049867 bytes, checksum: 3795ac8d42faebe8c0948c4675933f15 (MD5) Previous issue date: 2007
  • This is an author-produced PDF of an article accepted for publication in Tree Physiology following peer review. The definitive publisher-authenticated version is available online at http://treephys.oxfordjournals.org/.

Relationships

Parents:

This work has no parents.

Last modified

Downloadable Content

Download PDF

Items