Global warming caused by increasing atmospheric CO2 concentrations is one of the most serious challenges facing human society in the 21st century. The global soil organic carbon pool is about three times larger than the atmospheric carbon pool, so the release of CO2 through the decomposition of soil organic carbon has a significant impact on atmospheric CO2 concentrations, which in turn changes regional and global climate. The intensity of soil organic carbon decomposition is regulated by temperature, and its sensitivity to temperature is considered to be one of the key determinants of future climate change trends, and is a key assumption and important parameter in terrestrial climate prediction models. The temperature sensitivity of soil heterotrophic respiration is generally expressed as Q10 (the number of times the rate of heterotrophic respiration increases for every 10°C increase in temperature). From regional to global scales, most ecosystem models (e.g. RoLK-C, PnET, TEM, etc.) use the Q10 function to estimate the amount of temperature impact on soil heterotrophic respiration, but Q10 is often considered to be a constant 2 with a non-linear relationship with soil heterotrophic respiration, and small deviations from Q10 in the model can lead to large errors in the estimation and prediction of soil heterotrophic respiration. Small deviations in Q10 in the model can produce large errors in the estimation and prediction of soil heterotrophic respiration . The Intelligent Variable Temperature Incubation Soil Greenhouse Gas Measurement System uses continuous variable temperature incubation combined with continuous-high frequency soil microbial respiration rate measurement devices and techniques to overcome the important shortcomings of the constant temperature incubation model of soil microbial adaptation to specific incubation temperatures and uneven substrate consumption. The intelligent variable temperature incubation soil greenhouse gas measurement system can combine the temperature characteristics of the incubation process with continuous, high frequency testing (2-20min/time) of each sample during the ramp-up/down process to improve the accuracy of the Q10 fit by determining the respiration rate of soil microorganisms at a wider range of temperatures. The system allows for a customisable number of samples to be loaded simultaneously, facilitating the testing of large numbers of samples or large scale networking studies. In-depth understanding of the magnitude and temporal dynamics of soil respiration is valuable for predicting changes in the global soil carbon cycle under future climate scenarios and assessing carbon neutrality targets and related technical approaches.
Features
Technical specifications
1. Temperature-controlled high-frequency soil microbial respirometry system
Sampling module: 3-axis vertical slide
Repeat positioning accuracy: ±0.5mm
Number of sample vial positions: 25 (customisable)
Vial volume: 150mL (customisable)
Internal gas circuit: Teflon tube
Gas flow rate: 1L/min (adjustable)
Calibration system: 3-way gas calibration module for automatic data calibration (optional)
Temperature rise and fall rates: refer to heating and cooling system parameters
Temperature control accuracy: refer to heating and cooling system parameters
Endurance: 7*24 hours automatic operation
Operating mode: Industrial control computer
Operating voltage: 220V
Expandability: Multiple data transmission channels are reserved, additional accessories and sensors can be added according to customer requirements
2.CO2 H2O analysis module (standard configuration, customisable)
CO2 measurement range: 0 ~ 2000 ppm (customisable)
CO2 Accuracy: Better than ±1% of reading
CO2 zero point drift: <0.15ppm/°C
CO2 span drift: <0.03%/°C
CO2 total drift: <0.4ppm/°C @ 370ppm
H2O measurement range: 0-6%
H2O Accuracy: Better than ±1.5% of reading
H2O zero point drift: 3ppm/°C
H2O span drift: <0.03%/°C
Total H2O drift: 9ppm/°C @ 10000ppm
Sampling flow rate: 1L/min standard, adjustable
Operating temperature: -20 ~ 45 °C
Humidity: <99% R.H, non-condensing
Operating pressure: 800 ~ 1150 mbar
T90 response time: 10 s as standard, adjustable
Calibration frequency: recommended once every 12 months
Output: RS-232, analogue output
Power supply: DC: 12-30 V, 0.3 A
Control: via data interface, controlled by the system host
3. Temperature control module (standard configuration, customisable)
Temperature range (°C): -28 ~50
Temperature control: PID, cascade
Temperature stability (°C): ±0.5
Set / display resolution: 0.1 °C
Pump flow rate (l/min): 11 - 16
Pump pressure (bar): 0.23-0.45
Charge volume (L): 20
External Pt100 sensor connection: Integrated
Communication interface: RS232
Heating power: 2 kW
Cooling compression: air cooled
Weight: 31 kg
Origin and Manufacturer：China Eco-mind
