Metabolism（metabolism）It is the most fundamental characteristic of life, in which plants carry out two relatively independent and interdependent processes: photosynthesis and respiration: the former absorbsCO₂And use solar energy to synthesize organic compounds while releasing oxygen, which then consumes oxygen and is dischargedCO₂Photosynthesis occurs in the green tissues of plants, especially in the leaves, and mainly occurs during the day, while plant respiration occurs in all tissues such as roots, stems, leaves, seeds, fruits, etc., and is ongoing at all times. The plant respiration measurement system consists ofCO₂Composed of analyzers, oxygen analyzers, gas sampling units, data acquisition and analysis systems, it can measure the respiration or net respiration and net photosynthesis of plant roots, stems, leaves, fruits, seeds, and the whole plant. It is used for plant physiological and ecological research, root respiration research, seed storage and vitality detection, vegetable and fruit storage research, etc.

Functional features:

üHigh precision, high stability, high resolution

üOptional laboratory modular measurement system, or optional field portable measurement system

üFree combination of closed measurement, open measurement, or measurement and analysis using sampling flow injection technology

üThe configuration is flexible and diverse, and different combinations of configurations can be selected according to the budget situation and research purposes. Simple configurations can beCO₂Composed of an analyzer, breathing chamber, and data acquisition display, the complex configuration includesCO₂Analyzer, oxygen analyzer, water vapor analyzer, precision gas sampling unit, gas path converter (multi-channel system), data collector and analysis software, etc

üThe system can be used for animal respiration measurement, soil respiration measurement, and photosynthesis measurement (corresponding accessories need to be selected according to specific research purposes)

Technical parameters:

1. Oxygen analysis measurement（FC–10）：

Oxygen measurement range:0–100％； resolving power:0.0001%；Accuracy: superior to0.1％； Response time: less than7Seconds;24Hourly drift: below0.01％

20Minute noise: below0.002％pk–pkTemperature and pressure compensation，4Channel analog output,16bitresolving power; Digital filtering (noise)0–50Adjustable in seconds, amplification0.2Seconds, built-inA/DConverter resolution24 bitsCan simultaneously measure temperature (measurement range)0–60℃, resolution0.001℃) and air pressure (measurement range)30–110kPa, Resolution0.0001kPa）； Two lines of text and numbersLCDDisplay screen with backlight, capable of simultaneously displaying oxygen content and air pressure; size33×25×10cmWeight approximately4.5kgThere is also an alternative dual channel high-precision oxygen analysis measuring instrument.

2. High precision differential oxygen analyzer (optional), suitable for measuring respiratory metabolism of small insects, measurement range0–100%, accuracy0.1%, Resolution0.0001%

3. Carbon dioxide analysis and measurement（CA–10）Dual wavelength non dispersive infrared technology, measurement range0–5%Or0–15%Two level selection (two-way), built-in data acquisition system, real-time measurement, response time less than1Second, resolution better than0.0001%perhaps1ppm(reachable)0.1ppm）, accuracy1%Suggest airflow5–2000ml/Minutes, noise less than2ppm，24Hourly drift below0.002%Through software temperature compensation and sampling frequency10Hz; with two lines of text and numbersLCDDisplay screen with backlight, capable of displaying simultaneouslyCO₂Content and pressure;4Channel analog output,16bitResolution, with digital filtering (noise); size33×25×10cmWeight approximately4.5kg

4. Ultra high precision carbon dioxide analysis and measurement (optional): Differential non dispersive infrared gas analyzer, used to measure the respiratory metabolism of microorganisms (such as flies) or ticks and mites, with a measurement range0–3000ppm, with a resolution of0.01ppm, accuracy1%

5. RH–300Water vapor measuring instrument (optional): measurement range0.2％–100%(Relative humidity), resolution0.001%Relative humidity, dew point temperature-40–40℃, resolution0.002℃ (dew point temperature), water vapor density0–10µg/mlResolution0.0001µg/ml, water vapor pressure0–20kPaResolution0.01Pa; Analog output16 bitsSuggest airflow speed5–2000ml/min, with two lines of text and numbersLCDDisplay screen with backlight, capable of simultaneously displaying water vapor content and temperature

6. SS4Gas secondary sampling unit: including a pump, needle valve (controlling the airflow in and out of the pump body), and gas flow meter（0–2000ml/m）； Diaphragm pump, roller motor, maximum flow rate2–4L/minThermal bridge flowmeter, resolution1ml/min, accuracy2%; Analog output12 bits; Weight approximately2kg

7. Gas path converter:8Channel (including one)BaselineChannel), sampling frequency10Hz

8. UI–2data collector,12Channel,8An analog input,16bitresolving power;4Temperature input, resolution0.001centigrade;8A digital output is used for system control,1individual16bitCounter,2Channel voltage output, pulse width modulation

9. Breathing chamber: equipped with borosilicate glass material micro breathing chamber (diameter)9.0mm, volume0.5–1.0ml）Small breathing chambers (with different diameters available for selection) and medium to large breathing chambers (used for whole plants or fruits, etc.) are available for selection

10. Professional technical configuration and training, including training on different assembly and operation techniques such as closed, open, suction, push, sampling flow injection, etc

The above figure shows that the Horticulture Department of Cornell University used a plant respiration measurement system to study the effects of storage temperature and humidity changes on the respiration and survival of dried block roots of Ranunculus japonicus. The results showed that5At ℃, humidity changes have little effect on the respiration rate of the sample, while at25At ℃, humidity significantly affects its respiratory function（HortScience，2011）

Origin: United States