As global change research becomes more widespread, the measurement of gas fluxes is of increasing interest. Gas fluxes are usually measured at the plant leaf-atmosphere interface, at the soil surface-atmosphere interface and at the ecosystem-atmosphere interface. Because of the spatial heterogeneity of soils, soil respiration varies considerably even within the same soil type in the same block, and scientists need to conduct multi-dimensional studies in space, time and gas type to better explain the mechanisms underlying soil respiration. It can also be configured with a variety of gas isotope analysers and has excellent scalability to connect to 8, 16 or 24 channel respiration chambers or transparency chambers and soil profile gas sampling probes. The multi-channel soil respiration measurement system provides a new technique for high frequency monitoring of trace gas concentrations in soil pores to investigate the effects of temperature, soil moisture and fertiliser inputs on trace gas fluxes, yields and consumption. The continuous and simultaneous monitoring of multiple greenhouse gases at different subsurface-surface locations allows a better understanding of the changes in soil response to climate, as well as access to the linkage mechanisms within the soil and at the soil-atmosphere interface and the different responses to climate change.
Technical principles
Tunable Laser Spectroscopy (TDLAS), Dynamic Confined Gas Chamber Method
Features
l Tunable Laser Spectroscopy (TDLAS) for high temporal resolution, highly sensitive measurements
l Calibration-free and does not require a timed calibration of the standard gas
l Free from background gas cross-talk
l Allows simultaneous control of different types of soil respiration chambers
l Can be used with multiple brands of analysers (customisation possible)
l Highly scalable and can be supplemented with a wide range of sensors (e.g. GPS, light radiation sensors, etc.)
l Highly operational, with powerful data processing functions and the ability to process data online in real time
l High degree of customisation
Performance indicators
|
CO2 /H2O/CH4（可选） Analysis module |
|||
|
CO2 Measurement range |
0 ~2000 ppm |
CH4Measurement range |
0 ~100 ppm |
|
CO2 Minimum detection limit |
1ppm |
CH4 Minimum detection limit |
0.1ppm |
|
CO2 Zero Point Noise |
0.5ppm |
CH4 Zero Point Noise |
0.15ppm |
|
CO2 80% range noise |
2ppm |
CH4 80% range noise |
0.3ppm |
|
CO2 Range precision（20%、80%） |
2ppm |
CH4 Range precision（20%、80%） |
0.3ppm |
|
H2O Measurement range |
0 ~ 6% |
Calibration |
Factory calibration without recalibration |
|
H2O Accuracy |
Better than ±1.5% of reading |
Sampling flow rate |
Standard 1L/min, adjustable |
|
Typical temperature accuracy |
±0.1@20-60 °C |
|
|
|
Multiplex control system |
||||||||||||
|
|
|
Number of channels |
1~36 channels selectable |
Operating temperature |
-20 ~ 50 °C |
|||||||
|
|
|
Mode of operation |
Touch Screen |
Humidity |
<99% R.H，Non-condensing |
|||||||
|
|
|
Positioning module |
BeiDou GPS dual mode (optional) |
Sampling flow rate |
Standard 1L/min, adjustable |
|||||||
|
|
|
Data calculation |
Yes (flux, respiration rate) |
Power supply |
12VDC |
|||||||
|
|
|
Weight |
12kg |
Standard gas module |
Optional |
|||||||
|
|
|
Optional modules available |
Additional gas measurement modules, soil temperature and humidity sensors, 4G transmission modules, GPS modules, etc. can be added |
|||||||||
|
|
|
Extensibility |
The main control board is reserved for multiple data transmission channels and additional accessories and sensors can be added according to customer requirements. The software is developed independently and can be synchronised with the relevant additional sensors for data integration. It can be used in conjunction with soil respiration chambers and community photosynthesis chambers for soil interface observation and research to realise a variety of three-dimensional trace gas monitoring systems for interface emissions. |
|||||||||
|
Round soil breathing chamber
|
||||||||||||
|
Soil breathing chamber types |
Transparent (aluminium) / non-transparent (acrylic) |
Electricity supply |
12V |
|||||||||
|
Overall external dimensions |
440mm（L）×260mm（W）×260mm（H） |
Control method |
Master control |
|||||||||
|
Weight |
5.0Kg |
Chamber size |
200mm（D）*130mm(H) |
|||||||||
|
Measurement methods |
Dynamic pressure balance flow-through measurement |
Measuring volume |
4000cm3 |
|||||||||
|
How it works |
Controlled automatic opening and closing |
Measured area |
315cm2 |
|||||||||
|
|
||||||||||||
|
Leaf chamber style |
Transparent/non-transparent |
Control method |
Master control |
|||||||||
|
Leaf chamber dimensions |
50cm（L）*50cm（W）*40cm（H） |
Electricity supply |
12V |
|||||||||
|
Leaf chamber weight |
15kg |
Leaf chamber measurement volume |
90.5L |
|||||||||
|
How the leaf chamber works |
Controlled automatic swivel opening and closing (upper window 90°, side windows 45°) |
Leaf chamber measurement area |
0.1936m2 |
|||||||||
|
Drive type |
Electric Actuators |
Temperature monitoring |
-40℃—85℃ |
|||||||||
|
Material |
Aluminium alloy, imported transparent PC sheet |
Sealing method |
Sealing Strip Seals |
|||||||||
|
Underground profile gas extraction unit
|
||||||||||||
|
Technical principles |
Semi-permeable membrane gas extraction technology |
Control method |
Master control |
|||||||||
|
Size |
500 mm (L) x 6 |
Sensors |
Temperature sensors |
|||||||||
|
Material |
Semi-permeable membrane, aluminium stand |
|
|
|||||||||
Origin and Manufacturer：China Eco-mind
