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Bordered pit structure and function determine spatial patterns of air-seeding thresholds in xylem of Doulglas-fir (Pseudotsuga menziesii; Pinaceae) trees

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
Full Text:: weighted average between outer and inner sapwood samples. Tree location Height (m) P50 (MPa) Wp (MPa

Dynamics of water transport and storage in conifers studied with deuterium and heat tracing techniques

Creator:: Meinzer, Frederick C., Brooks, J. R., Domec, Jean-Christophe, Gartner, Barbara L., Warren, J. M., Woodruff, D. R., Bible, K., and Shaw, D. C.
Abstract:: The volume and complexity of their vascular systems make the dynamics of long‐distance water transport in large trees difficult to study. We used heat and deuterated water (D₂O) as tracers to characterize whole‐tree water transport and storage properties in individual trees belonging to the coniferous species Pseudotsuga menziesii (Mirb.) Franco...
Resource Type:: Article

Effects of release from suppression on wood functional characteristics in young Douglas-fir and western hemlock

Creator:: Renninger, Heidi J., Gartner, Barbara L., and Meinzer, Frederick C.
Abstract:: Little is known of wood properties in trees that were initially suppressed and subsequently released from suppression. The purpose of this study was to assess differences in growth ring width, specific conductivity (Ks), tracheid dimensions, moisture content, and wood density in suppressed Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and western hemlock...
Resource Type:: Article
Full Text:: western hemlock (Renninger et al. 2006; see Table 1) and that height growth in the most recent 5-year

Impacts of tree height on leaf hydraulic architecture and stomatal control in Douglas-fir

Creator:: Woodruff, David R., McCulloh, Katherine A., Warren, Jeffrey M., Meinzer, Frederick C., and Lachenbruch, Barbara
Abstract:: This study investigated the mechanisms involved in the regulation of stomatal closure in Douglas-fir and evaluated the potential impact of compensatory adjustments in response to increasing tree height upon these mechanisms. In the laboratory, we measured leaf hydraulic conductance (Kleaf) as leaf water potential (Yl) declined for comparison with in...
Resource Type:: Article
Full Text:: .1365-3040.2007.01652.x Impacts of tree height on leaf hydraulic architecture and stomatal control in

A comparison of daily water use estimates derived from constant-heat sap-flow probe values and gravimetric measurements in pot-grown saplings.

Creator:: McCulloh, Katherine A., Winter, Klaus, Meinzer, Frederick C., Garcia, Milton, Aranda, Jorge, and Lachenbruch, Barbara
Abstract:: Use of Granier-style heat dissipation sensors to measure sap flow is common in plant physiology, ecology and hydrology. There has been concern that any change to the original Granier design invalidates the empirical relationship between sap flux density and the temperature difference between the probes. Here, we compared daily water...
Resource Type:: Article
Full Text:: plastic containers (diameter 78 cm up to a height of 73 cm, total height 99 cm) filled with forest soil

Maximum height in a conifer is associated with conflicting requirements for xylem design

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
Full Text:: tree height, the mechanisms governing ultimate and species-specific height limits are not yet

Height-related trends in leaf xylem anatomy and shoot hydraulic characteristics in a tall conifer: safety versus efficiency in foliar water transport

Creator:: Woodruff, D. R., Meinzer, Frederick C., and Lachenbruch, Barbara
Abstract:: • Hydraulic vulnerability of Douglas-fir (Pseudotsuga menziesii) branchlets decreases with height, allowing shoots at greater height to maintain hydraulic conductance (Kshoot) at more negative leaf water potentials (Ψl). • To determine the basis for this trend shoot hydraulic and tracheid anatomical properties of foliage from the tops of Douglas-fir trees...
Resource Type:: Article
Full Text:: function of tree size (height) rather than age (Koch et al., 2004; Woodruff et al., 2004; Bond et al., 2007

Xylem hydraulic safety margins in woody plants: coordination of stomatal control of xylem tension with hydraulic capacitance

Creator:: Meinzer, Frederick C., Johnson, Daniel M., Lachenbruch, Barbara, McCulloh, Katherine A., and Woodruff, David R.
Abstract:: 1. The xylem pressure inducing 50% loss of hydraulic conductivity due to embolism widely used for comparisons of xylem vulnerability among species and across aridity However, despite its utility as an index of resistance to catastrophic xylem failure drought, P5o may have no special physiological relevance in the context of...
Resource Type:: Article
Full Text:: . & Lachenb- ruch, B. (2007) Impacts of tree height on lcafhydraulic architecture and sto- matal control in

Coordination of leaf structure and gas exchange along a height gradient in a tall conifer

Creator:: Woodruff, D. R., Meinzer, Frederick C., Lachenbruch, Barbara, and Johnson, D. M.
Abstract:: The gravitational component of water potential and frictional resistance during transpiration lead to substantial reductions in leaf water potential (Ψl) near the tops of tall trees, which can influence both leaf growth and physiology. We examined the relationships between morphological features and gas exchange in foliage collected near the tops...
Resource Type:: Article
Full Text:: us to investigate the effects of tree height on leaf structural characteristics in the absence of

Safety factors for xylem failure by implosion and air-seeding within roots, trunks and branches of young and old conifer trees

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
Full Text:: minimum (t / b)2 value of about 0.032 for trunks at ground level (tree height of 0) (Fig. 4a), which

ScholarsArchive@OSU

Bordered pit structure and function determine spatial patterns of air-seeding thresholds in xylem of Doulglas-fir (Pseudotsuga menziesii; Pinaceae) trees

Dynamics of water transport and storage in conifers studied with deuterium and heat tracing techniques

Effects of release from suppression on wood functional characteristics in young Douglas-fir and western hemlock

Impacts of tree height on leaf hydraulic architecture and stomatal control in Douglas-fir

A comparison of daily water use estimates derived from constant-heat sap-flow probe values and gravimetric measurements in pot-grown saplings.

Maximum height in a conifer is associated with conflicting requirements for xylem design

Height-related trends in leaf xylem anatomy and shoot hydraulic characteristics in a tall conifer: safety versus efficiency in foliar water transport

Xylem hydraulic safety margins in woody plants: coordination of stomatal control of xylem tension with hydraulic capacitance

Coordination of leaf structure and gas exchange along a height gradient in a tall conifer

Safety factors for xylem failure by implosion and air-seeding within roots, trunks and branches of young and old conifer trees

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