LI-600 Fluorescence Pore Measuring Instrument

LI-600 Fluorescence Pore Measuring InstrumentSuitable for broad-leaved plants. LI-600 is a handheld instrument that can simultaneously measure stomatal conductance and chlorophyll fluorescence parameters on the same leaf and region.

Design features:

The LI-600 is designed for rapid and accurate measurement of stomatal conductance and chlorophyll fluorescence in broad-leaved plants under natural environmental conditions.

Stable within 5-10 seconds, suitable for leaves with different sizes of stomatal conductance.

Users can customize measurement stability standards.

Working Principle:

LI-600 Fluorescence Pore Measuring InstrumentIt is a compact and portable device that integrates numerous innovative technologies to achieve rapid and accurate measurement of leaf stomatal conductance and chlorophyll fluorescence

Pore conductance:

LI-600 uses an open circuit differential method to measure the transpiration rate and stomatal conductance of single-sided leaves. Firstly, the transpiration rate (E) of the leaves is calculated by measuring the airflow velocity and water vapor mole fraction entering and exiting the leaf chamber. Then, by measuring the leaf temperature and the water vapor concentration inside the leaf chamber, the water vapor concentration gradient between the leaves and the surrounding environment is calculated. Obtain the total conductance (gtw) of leaves to water vapor by using a functional relationship between E and the gradient of water vapor concentration. Finally, the leaf boundary layer conductance gbw in the gtw component is subtracted through a functional relationship to calculate the stomatal conductance gsw of the leaf.

Advantages of LI-600 airflow design and measurement method:

Quickly balance and complete the measurement quickly, with a measurement duration of 5-15s.

Perform differential measurements in almost natural environments.

The light, CO2, and water vapor concentrations during blade measurement are almost identical to the external environment, and the disturbance is very small. No need to use desiccants or introduce diffusion gradient correction.

Automatic matching eliminates system errors.