Title

Environmental control of leaf water conductance in conifers

Document Type

Article

Publication Title

Canadian Journal of Forest Research

Publication Date

1976

Volume

6

Issue

1

First Page

104

Last Page

112

Abstract

Diurnal measurements of leaf conductance, xylem water potential, temperature, humidity, and radiation were taken on six sites throughout Oregon. Xylem water potential was hypothesized to influence leaf conductance in two ways. First, predawn xylem water potential controlled the early-morning maximum leaf conductance of Pseudotsugamenziesii (Mirb.) Franco. Second, irrespective of predawn water potential, a threshold diurnal water potential was found. Whenever water potential of Pseudotsugamenziesii dropped below −20 bars (−20 × 105 Pa) during the day, a significant decrease in leaf conductance resulted. If the water potential threshold was not reached during the day, leaf conductance stayed at the morning maximum or decreased slightly in response to decreasing humidity.

DOI

http://dx.doi.org/10.1139/x76-013

Rights

© 1976 NRC Research Press

This document is currently not available here.

Request Access

Share

COinS