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Updated: Jun 23, 2026

Measurement of Leaf Hydraulic Conductance and Stomatal Conductance and Their Responses to Irradiance and Dehydration Using the Evaporative Flux Method (EFM)

Measurement of Leaf Hydraulic Conductance and Stomatal Conductance and Their Responses to Irradiance and Dehydration Using the Evaporative Flux Method (EFM)

Published on: December 31, 2012

Night-time transpiration can decrease hydraulic redistribution.

Ava R Howard¹, Marc W van Iersel, James H Richards

¹Department of Plant Biology, University of Georgia, Athens, GA 30602, USA. howarda@wou.edu

Plant, Cell & Environment

|May 9, 2009

Summary

This summary is machine-generated.

Nighttime transpiration (E(night)) can limit hydraulic redistribution (HR) in C3 plants. Suppressing E(night) increased HR in some species, impacting water cycling and productivity.

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Area of Science:

Plant physiology
Ecology
Hydrology

Background:

C3 plants are vital for ecosystem water cycling.
Plant water loss occurs via transpiration (E(night)) and hydraulic redistribution (HR) at night.
The relationship between E(night) and HR requires further investigation.

Purpose of the Study:

To determine if nighttime transpiration limits hydraulic redistribution in C3 plants.
To quantify the impact of suppressed E(night) on HR magnitude.
To explore the ecological implications of E(night)-HR interactions.

Main Methods:

Greenhouse study with three C3 plant species: Artemisia tridentata, Helianthus anomalus, and Quercus laevis.
Plants had roots split between two compartments.
Hydraulic redistribution was initiated by water withholding and differential watering; E(night) was suppressed using canopy bagging.

Main Results:

All species exhibited significant E(night) and HR.
Canopy bagging increased nightly HR (HR(N)) by 73% in A. tridentata and 33% in H. anomalus, but not in Q. laevis.
Total daily HR (HR(T)) correlated positively with soil water potential gradients and prior day's light/VPDa; negatively with night-time VPDa for A. tridentata.

Conclusions:

Nighttime transpiration influences the magnitude of hydraulic redistribution in certain C3 plants.
E(night) suppression can enhance HR, potentially affecting plant productivity and ecosystem water/nutrient dynamics, especially during dry periods.