Transpiration rate measurement using miniature temperature/humidity sensors

Area of Science:

• Plant physiology
• Environmental science
• Ecological monitoring

Background:

• Accurate measurement of plant transpiration rate (TR) is crucial for understanding plant water use and ecological responses.
• Existing methods for TR measurement can be invasive, time-consuming, or limited in their applicability.
• Mangrove ecosystems face unique challenges due to their saline environments, requiring specialized measurement techniques.

Purpose of the Study:

• To introduce and evaluate a novel, minimally invasive method for measuring the transpiration rate (TR) in mangrove plants.
• To compare the results of the novel method with a conventional porometer under different environmental conditions.
• To assess the practicality and efficiency of the new TR measurement technique.

Main Methods:

• Miniature temperature and humidity loggers were affixed to the leaf surface of Bruguiera gymnorrhiza using a spacer.
• Transpiration rate (TR) was calculated using the mass-balance equation based on logger data.
• Measurements were conducted under conditions where the plant root was surrounded by water and in a saline environment.

Main Results:

• The novel method demonstrated good agreement with a conventional porometer when the mangrove root system was submerged in water.
• A significant discrepancy was observed between the novel method and the conventional porometer in a saline environment.
• The leaf attachment procedure for the novel method was found to be minimally invasive and required very little time.

Conclusions:

• The proposed method offers a rapid and minimally invasive approach for assessing plant transpiration rate (TR).
• The technique shows high potential for ecological studies, particularly in environments with readily available water.
• Further refinement may be needed to improve accuracy in challenging saline conditions.