Hydraulic architecture ofAcer saccharumandA. rubrum: comparison of branches to whole trees and the contribution of leaves to hydraulic resistance
- 1 February 1994
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Experimental Botany
- Vol. 45 (2) , 179-186
- https://doi.org/10.1093/jxb/45.2.179
Abstract
Hydraulic resistance to water flow was measured in the xylem and leaves of above-ground portions of Acer saccharum and Acer rubrum for trees with trunk diameters (D) ranging from 0.02 to 0.2 m. Resistance (area basis) to water flow in leaves and petioles was 24 and 13 × 10 MPa m2s kg−1 for A. saccharum and A. rubrum, respectively. Leaf area of whole trees was proportional to D1.52. Absolute xylem resistance (MPa s kg−1 was proportional to D−1.54. So xylem resistance (area basis) was proportional to D0.2, which was not significantly different from a zero dependence (D0) for D≪0.2 m. On a leaf area basis, the resistance to water flow in the whole shoots was found to be approximately 50% in leaves and petioles, 35% in crown xylem, and 15% In trunk xylem for D≪0.2 m.Keywords
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