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Product details
1Purpose:
As is well known, water loss through plant leaves is an important factor that is directly related to air temperature, air pressure, humidity, and wind speed during plant transpiration. Pores affect light intensity and relative humidity（RH）It is highly sensitive to carbon dioxide, water stress, bacteria, and pollution.The AP4 pore meter utilizes the principle of cyclic diffusion to measure pore conductivity very accurately and conveniently, with good repeatability. Combined with leaf area meter and leaf temperature measurement, this instrument can help users estimate the water dispersion loss of the entire plant or crops with known coverage.Pore opening is an important factor in leaf surface stomatal conductance, which effectively controls the loss of water in the plant body and the absorption of carbon dioxide in photosynthesis. Therefore, stomatal conductance research is very important, as it reveals the water balance status in the plant body and provides important indicators for plant growth and adaptation to environmental factors.
Therefore, in quantifying the impact of different environmental changes on plant stomatal behavior,AP4 is a very valuable instrument that can also be used to compare different stress behavior responses of plants to environmental changes and stress.
sinceSince its invention in 1974, over 1000 AP4 devices have been widely used by researchers from around the world.
IIPrinciple:
According to the principle of cyclic diffusion, measurement and calculation are carried out based on the changes in surface humidity of plant leaves.
IIIcharacteristic:
lDirectly read the stomatal conductance and stomatal impedance of the leaf surface
lField calibration is simple and convenient
lMinimize the impact on the blades during the measurement process
lThe best tool for studying the characteristics of plant transpiration
lThe Windows version software can easily import the measured data into the computer and store it in CSV format
4form:
1. Host: including pneumatic system and analysis and calculation system;
2. Measurement handle: The measurement handle includes two replaceable blade chambers, one slot shaped and the other circular. Suitable blade chambers can be selected for different shapes of blades. The measurement handle is equipped with a micro electric heating regulatorRH sensor and PAR sensor;
3. Calibration plate: A specially cast polypropylene plastic plate with six sets of small holes of different diameters. When used, the bottom of the calibration plate is covered with moist filter paper, providing a water vapor source that diffuses through the small holes at a known rate.
4. Chargers, data cables, etc.
5Basic technical indicators:
parameter |
measuring range |
resolution |
accuracy |
Test conditions (reading range) |
Stomatal conductance |
5.0 -1200 mmol m-2 s-1 |
0.1 - 10 |
± 10 % |
5 - 800 mmol m-2 s-1 |
± 20 % |
800 - 1200 mmol m-2 s-1 |
|||
Stomatal conductance |
0.25 - 30.0 mm s-1 |
0.01 - 0.1 |
± 10 % |
0.25 - 20 mm s-1 |
± 20 % |
20 - 30 mm s-1 |
|||
stomatal resistance |
0.2 - 40 s cm-1 |
0.01 - 0.1 |
± 10 % |
0.5 - 40 s cm-1 |
± 0.2 s cm-1 |
0.2 - 0.5 s cm-1 |
|||
RH |
0 - 100% |
0.1 |
± 4% |
|
Sample room temperature |
-5 - +55 °C |
0.1 |
± 0.7 °C |
0 - 50 °C |
Temperature difference between sample room and leaves |
-5 - +5 °C |
0.1 |
± 0.2 °C |
0 - 50 °C |
PAR flux |
0 - 2500 µmol m-2 s-1 |
10 |
± 15% |
|
pressure |
600-1200 hPa, with a step size of 5 hPa |
|||
RH cycle level |
20-80% RH, with a step size of 5% |
|||
1Data storage:1500 pieces of data.
2Power system: Each time it is charged, it can be used for about20 hours, charging time is about 14 hours.
3Weight:3kg.
VIPlace of Origin:
Britain
references:Full text available for search
one Salvador Nogues and Neil R Baker, Effect of drought on photosynthesis in Mediterranean plants grown under enhanced UV-B radiation, Journal of Experimental Botany,Vol.51,No.348,pp.1309-1317,July 2000.
two Lewis N. Mills, Lee Hunt, Calum P. Leckie, The effects of manipulating phospholipase C on guard cell ABA-signalling, Journal of Experimental Botany, Vol. 55, No. 395, Crosstalk in Plant Signal Transduction Special Issue, pp. 199 ±204, January 2004, DOI: 10.1093/jxb/erh027 Advanced Access publication 12 December, 2003
three Spreer , Wolfram, Zbigniew Czaczyk , Martin Hegele , Water use and drought stress in greenhouse split-root lychee, Tropentag 2005, Stuttgart-Hohenheim, October 11-13, 2005, Confer mentence on International Agricultural Research for Develop.
four J.I. Burke, J.M. Finnan, A. Donnelly and M.B. Jones, The Effects of Elevated Concentrations of Carbon Dioxide and Ozone on Potato (Solanum tuberosum L.) Yield, ISBN 1 84170 208 0, May 2001
five A. Verhoef, The effect of temperature differences between porometer head and leaf surface on stomatal conductance measurements, Plant, Cell and Environment(1997) 20,641-646.
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