Water relations and hydraulic architecture of a tropical tree (Schefflera morototoni). Data, models, and a comparison with two temperate species (Acer saccharum and Thuja occidentalis)

The water relations and hydraulic architecture of a tropical tree (Schefflera morototoni) and of two temperate species (Acer saccharum and Thuja occidentalis) are reported. Among the water relations parameters measured were leaf and stem water storage capacity leaf water potential, transpiration, an...

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Published inPlant physiology (Bethesda) Vol. 96; no. 4; pp. 1105 - 1113
Main Authors Tyree, M.T. (Northeastern Forest Experiment Station, Burlington, VT), Snyderman, D.A, Wilmot, T.R, Machado, J.L
Format Journal Article
LanguageEnglish
Published Rockville, MD American Society of Plant Physiologists 01.08.1991
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Abstract The water relations and hydraulic architecture of a tropical tree (Schefflera morototoni) and of two temperate species (Acer saccharum and Thuja occidentalis) are reported. Among the water relations parameters measured were leaf and stem water storage capacity leaf water potential, transpiration, and vulnerability of stem to cavitation and loss of hydraulic conductivity by embolisms. Among the hydraulic architecture parameters measured were hydraulic conductivity per unit pressure gradient, specific conductivity, leaf-specific conductivity, and Huber value. In terms of vulnerability of stems to cavitation, stem and leaf capacitances, and leaf-specific conductivity, all three species followed the same sequence: Schefflera Acer Thuja. It is argued here that the high stem capacitance and high leaf-specific conductivity of Schefflera are necessary to compensate for its high vulnerability to cavitation. Extractable water storage per unit leaf area in Schefflera stems is 100 times that of Acer and may permit the species to survive unusually long, dry seasons in Panama. Although Schefflera frequently grows 20 meters, the biggest resistance to water flow in the shoots resides in the leaves
AbstractList The water relations and hydraulic architecture of a tropical tree (Schefflera morototoni) and of two temperate species (Acer saccharum and Thuja occidentalis) are reported. Among the water relations parameters measured were leaf and stem water storage capacity, leaf water potential, transpiration, and vulnerability of stems to cavitation and loss of hydraulic conductivity by embolisms. Among the hydraulic architecture parameters measured were hydraulic conductivity per unit pressure gradient, specific conductivity, leaf-specific conductivity, and Huber value. In terms of vulnerability of stems to cavitation, stem and leaf capacitances, and leaf-specific conductivity, all three species followed the same sequence: Schefflera > Acer > Thuja. It is argued here that the high stem capacitance and high leaf-specific conductivity of Schefflera are necessary to compensate for its high vulnerability to cavitation. Extractable water storage per unit leaf area in Schefflera stems is >100 times that of Acer and may permit the species to survive unusually long, dry seasons in Panama. Although Schefflera frequently grows >20 meters, the biggest resistance to water flow in the shoots resides in the leaves.
The water relations and hydraulic architecture of a tropical tree (Schefflera morototoni) and of two temperate species (Acer saccharum and Thuja occidentalis) are reported. Among the water relations parameters measured were leaf and stem water storage capacity leaf water potential, transpiration, and vulnerability of stem to cavitation and loss of hydraulic conductivity by embolisms. Among the hydraulic architecture parameters measured were hydraulic conductivity per unit pressure gradient, specific conductivity, leaf-specific conductivity, and Huber value. In terms of vulnerability of stems to cavitation, stem and leaf capacitances, and leaf-specific conductivity, all three species followed the same sequence: Schefflera Acer Thuja. It is argued here that the high stem capacitance and high leaf-specific conductivity of Schefflera are necessary to compensate for its high vulnerability to cavitation. Extractable water storage per unit leaf area in Schefflera stems is 100 times that of Acer and may permit the species to survive unusually long, dry seasons in Panama. Although Schefflera frequently grows 20 meters, the biggest resistance to water flow in the shoots resides in the leaves
Author Tyree, M.T. (Northeastern Forest Experiment Station, Burlington, VT)
Machado, J.L
Wilmot, T.R
Snyderman, D.A
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Issue 4
Keywords Tropical zone
Hydraulic conductivity
Plant leaf
Ecophysiology
Water potential
Cavitation
Aceraceae
Thuja occidentalis
Transpiration
Acer saccharum
Water regime
Dicotyledones
Morphology
Plant trunk
Angiospermae
Gymnospermae
Coniferales
Spermatophyta
Hardwood forest tree
Araliaceae
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Snippet The water relations and hydraulic architecture of a tropical tree (Schefflera morototoni) and of two temperate species (Acer saccharum and Thuja occidentalis)...
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SubjectTerms ACER SACCHARUM
Animal and plant ecology
Animal, plant and microbial ecology
ARALIACEAE
Architecture
Autoecology
Biological and medical sciences
Cavitation flow
Dry seasons
FEUILLE
Fundamental and applied biological sciences. Psychology
HOJAS
Hydraulics
Leaf area
Leaves
PANAMA
Petioles
Plants and fungi
PROPIEDADES FISICO-QUIMICAS
PROPRIETE PHYSICOCHIMIQUE
Rainy seasons
RELACIONES PLANTA AGUA
RELATION PLANTE EAU
THUJA OCCIDENTALIS
TRANSPIRACION
TRANSPIRATION
Water flow
Xylem
Title Water relations and hydraulic architecture of a tropical tree (Schefflera morototoni). Data, models, and a comparison with two temperate species (Acer saccharum and Thuja occidentalis)
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