Transpiration and Whole-Tree Conductance in Ponderosa Pine Trees of Different Heights

Changes in leaf physiology with tree age and size could alter forest growth, water yield, and carbon fluxes. We measured tree water flux (Q) for 14 ponderosa pine trees in two size classes (12 m tall and ∼40 years old, and 36 m tall and ∼ 290 years old) to determine if transpiration (E) and whole-tr...

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Bibliographic Details
Published in:Oecologia 2000-09, Vol.124 (4), p.553-560
Main Authors: Ryan, Michael G., Bond, Barbara J., Law, Beverly E., Robert M. Hubbard, Woodruff, David, Emil Cienciala, Jiri Kucera
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Autoecology
Biological and medical sciences
Coniferous forests
Ecosystems Ecology
Forest canopy
Fundamental and applied biological sciences. Psychology
Hydraulics
Leaf area
Leaves
Pinus ponderosa
Plants and fungi
Sapwood
Soil water
Transpiration
Tree age
Trees
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Summary:Changes in leaf physiology with tree age and size could alter forest growth, water yield, and carbon fluxes. We measured tree water flux (Q) for 14 ponderosa pine trees in two size classes (12 m tall and ∼40 years old, and 36 m tall and ∼ 290 years old) to determine if transpiration (E) and whole-tree conductance ($g_{\text{t}}$) differed between the two sizes of trees. For both size classes, E was approximately equal to Q measured 2 m above the ground: Q was most highly correlated with current, not lagged, water vapor pressure deficit, and night Q was
ISSN:0029-8549
1432-1939
DOI:10.1007/s004420000403