GA-C112 Plant Stomata Meter

Popis

GA-C112 Plant Stomata Meter

Instrument Overview:

Plant transpiration rate refers to the speed at which water, passing through the plant body and through the plant surface (mainly leaves), is released into the atmosphere as gas. The transpiration process generates transpiration pull, which is the primary driving force for passive water absorption and transport in plants, especially important for tall trees. Transpiration promotes the transport of substances in the xylem sap, allowing mineral salts from the soil and substances synthesized by the roots to be transported and distributed throughout the plant as water is absorbed and collected. Transpiration also lowers the plant’s temperature, preventing leaf burn, because water has a high heat of vaporization, and a significant amount of radiant heat is dissipated during transpiration. Normal transpiration facilitates CO2 assimilation because stomata are open during transpiration, becoming channels for CO2 to enter the leaves. Proto, crop plant transpiration rate measuring instruments are of great significance for agricultural research, teaching, horticultural research, and forestry research.

GA-C112 Plant Stomata Meter

Test Specifications:

Leaf Temperature
Photosynthetically Active Radiation (PAR)
Air Temperature
Air Humidity
Transpiration Rate
Stomatal Conductivity
Stomatal Impedance

GA-C112 Plant Stomata Meter

Technical Specifications:

Air Temperature: High-precision digital temperature sensor, measurement range: -20-80℃, rozlišení: 0.1℃, error ±0.2℃
Leaf Temperature: Platinum resistance thermometer, measurement range: -20-60℃, rozlišení: 0.1℃, error ±0.2℃
Vlhkost vzduchu: High-precision digital humidity sensor, measurement range: 0-100%, rozlišení: 0.1%, error ≤±3%
Photosynthetically Active Radiation (PAR): Silicon photovoltaic cell with correction filter, measurement range: 0-3000µmolm²/s, přesnost <5µmolm²/s
Flow Rate: Miniature flow meter, flow rate can be set arbitrarily within the range of 0-1.5L, stable airflow. Error: 1%, within the range of 0.2～1L/min <±0.2%
Channel size: Standard size 55×20mm, can be customized according to customer needs
Working environment: Temperature 20℃—50℃, relativní vlhkost: 0-100% (no water vapor condensation)
Zdroj napájení: Large capacity DC8.4V rechargeable lithium battery, each charge can work continuously for 20 hodin. (without external light source)
Datové úložiště: 16G memory, expandable to 32G
Přenos dat: USB connection to computer can directly export data.
Zobrazit: 3.5″ TFT true color LCD screen color display, resolution 800×480, clearly visible under strong light
Rozměry: 260×260×130mm
Hmotnost: Main unit 3.25kg;

GA-C112 Plant Stomata Meter

Factors affecting transpiration

1. Internal factors affecting transpiration
(1) Stomatal frequency (stomatal frequency) (1) Frekvence (number of stomata per square millimeter of leaf): A high stomatal frequency promotes transpiration.
(2) Stomatal size: Larger stomatal diameters result in lower internal resistance and faster transpiration.
(3) Stomatal cavity: A larger stomatal cavity volume leads to a greater vapor pressure difference between the inside and outside of the leaf, resulting in faster transpiration.
(4) Stomatal opening: A larger stomatal opening results in faster transpiration; conversely, a smaller opening results in slower transpiration.

2.External factors affecting transpiration:
The transpiration rate depends on the magnitude of the vapor pressure difference between the inside and outside of the leaf and the diffusion resistance. Proto, any external factor affecting the vapor pressure difference and diffusion resistance will affect the transpiration rate.
(1) Light: The effect of light on transpiration: První, it causes stomata to open, reducing stomatal resistance and thus enhancing transpiration. Druhý, light can increase the temperature of the atmosphere and the leaf, increasing the vapor pressure difference between the inside and outside of the leaf and accelerating the transpiration rate.
(2) Teplota: The effect of temperature on transpiration… The transpiration rate is greatly affected. When the atmospheric temperature rises, the leaf temperature is 2-10°C higher than the air temperature. Proto, the increase in vapor pressure in the lower stomata is greater than the increase in air vapor pressure, increasing the vapor pressure difference between the inside and outside of the leaf and thus increasing the transpiration rate. When the air temperature is too high, the leaves lose too much water, the stomata close, and transpiration weakens.
(3) Vlhkost vzduchu: At the same temperature, the higher the relative humidity of the atmosphere, the greater its vapor pressure, and the smaller the vapor pressure difference between the inside and outside of the leaf. Water vapor in the lower stomata is not easily diffused out, and transpiration weakens. Conversely, the lower the relative humidity of the atmosphere, the faster the transpiration rate.
(4) Wind speed: Higher wind speeds can disperse the water vapor diffusion layer outside the stomata on the leaf surface, replacing it with air of lower relative humidity. This reduces diffusion resistance and increases the vapor pressure difference between the inside and outside of the leaf, accelerating transpiration. Strong winds may cause the stomata to close, increasing internal resistance and weakening transpiration.