Plant Stem Flow Measuring Instrument

The Plant Stem Flow Meter employs the heat dissipation probe method to measure instantaneous stem flow density in tree trunks, enabling long-term continuous observation of tree sap flow. This facilitates research into water exchange patterns between trees and the atmosphere, serving as an observational tool for long-term monitoring of forest ecosystems' responses to environmental changes. It holds significant theoretical guidance and practical value for afforestation, forest management, and forestry administration.

The plant stem flow meter employs a novel sap flow measurement technique developed by French scholar Granier in the 1980s: the heat dissipation probe method (constant heat flux sensor method).

This method ensures accurate and stable data acquisition, enabling continuous, uninterrupted readings that yield systematic data. The measurement system consists of a pair of 33mm-long heat dissipation probes. During installation, the probes are inserted into the tree's sapwood at a vertical spacing of 10cm-15cm. The upper probe is wrapped with a resistance wire and heated by direct current, while the lower probe remains unheated, maintaining the same temperature as the surrounding sapwood tissue. The temperature difference between the two probes reflects the tree's sap flow density.

• Dual probes with matching drilling tools for easy insertion and removal, enabling repeated use.

• Features high-precision T-type thermocouples directly connected to the data analyzer.

• Employs thermal dissipation for constant-temperature heating.

• Stainless steel probes with Teflon coating for long-lasting durability.

• Capable of continuous long-term monitoring.

• Utilizes high-capacity SD card storage.