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Creator:: Domec, Jean-Christophe, Meinzer, Frederick C., Gartner, Barbara L., and Woodruff, D.
Abstract:: We determined the axial and radial xylem tension gradients in trunks of young Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) trees. Axial specific conductivity (ks-a) and sap flux density (Js) were measured at four consecutive depths within the sapwood at a stem height of 1 m. By definition, at a given position...
Resource Type:: Article

Creator:: Domec, Jean-Christophe, Meinzer, Frederick C., Lachenbruch, Barbara, and Housset, Johann
Abstract:: Our goals were to quantify how non-embolism-inducing pressure gradients influence trunk sapwood specific conductivity (ks) and to compare the impacts of constant and varying pressure gradients on ks with KCl and H2O as the perfusion solutions. We studied six woody species (three conifers and three angiosperms) which varied in pit...
Resource Type:: Article

Creator:: Domec, Jean-Christophe, Lachenbruch, Barbara, and Meinzer, Frederick C.
Abstract:: The air‐seeding hypothesis predicts that xylem embolism resistance is linked directly to bordered pit functioning. We tested this prediction in trunks, roots, and branches at different vertical and radial locations in young and old trees of Pseudotsuga menziesii. Dimensions of bordered pits were measured from light and scanning electron micrographs,...
Resource Type:: Article

Creator:: Domec, Jean-Christophe, Lachenbruch, Barbara, Meinzer, Frederick C., Woodruff, David R., Warren, Jeffrey M., and McCulloh, Katherine A.
Abstract:: Despite renewed interest in the nature of limitations on maximum tree height, the mechanisms governing ultimate and species-specific height limits are not yet understood, but likely involve water transport dynamics. Tall trees experience increased risk of xylem embolism from air-seeding because tension in their water column increases with height due...
Resource Type:: Article

Creator:: Domec, Jean-Christophe, Warren, Jeffrey M., Meinzer, Frederick C., and Lachenbruch, Barbara
Abstract:: The cohesion-tension theory of water transport states that hydrogen bonds hold water molecules together and that they are pulled through the xylem under tension. This tension could cause transport failure in at least two ways: collapse of the conduit walls (implosion), or rupture of the water column through air-seeding. The...
Resource Type:: Article

Creator:: Domec, Jean-Christophe
Abstract:: Every wood anatomist knows that the wood near the center of a tree (juvenile wood) differs from the wood laid down at some distance from the pith (mature wood), and that the wood produced during the spring (earlywood) differs from the wood produced during the summer (latewood). There is a...
Resource Type:: Dissertation

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