Soil

Whether your research is laboratory based, field based, long term or short term, ADC can offer you superior CO2 flux measurements whatever your application. Currently, concentrations of atmospheric carbon dioxide are rapidly rising. The balance of CO2 that remains in the atmosphere depends on the rate at which excess atmospheric carbon is assimilated into terrestrial sinks. The World Development Report, 2010, estimates that globally, soils contain 1,500 gigatons of the terrestrial carbon pool – 3 times the amount in above-ground biomass (570 gigatons) and twice the amount in atmospheres (750 gigatons). Hence, even relatively small fluxes in soil storage per unit area could have a significant impact on atmospheric carbon concentrations. Organic carbon stored in soils is continually released by the process of soil respiration. However, the rate of this release is strongly affected by soil composition and conditions. In addition, some soil management practices can cause significant loss of carbon from soil, such as cultivation and prescribed fires, while practices such as crop fertilization, reduced tillage, and irrigation can reduce carbon loss. This has led to increased research interest in the response of soils to elevated CO2 and the potential of terrestrial stores to counter emissions from human industry. Research focuses on better understanding of factors that affect the rate of carbon release and practices that can be used to further enhance carbon sequestration in soils. The amount of gas exchange taking place is also a useful indicator of microbial soil activity and soil health. For the long-term monitoring of CO2 exchanges between terrestrial ecosystems and the atmosphere, ADC designed the ACE system (Automated soil CO2 Exchange system). Specialised for the long-term, unattended monitoring of soil flux, the ACE automatically exposes the soil area to ambient conditions between analysis cycles, and then closes prior taking a soil flux measurement. This feature makes the ACE an invaluable tool for continuous assessment of below-ground carbon dioxide stores and on-going investigation into the quantitative nature of the carbon cycle. The Soil Respiration Series (SRS) are a range of highly portable systems to assess the spatial and temporal variability of soil respiration. Both the SRS-SD1000 and SRS-SD2000 have a soil respiration chamber with an integral Infrared Gas Analyser to ensure the fastest possible response to gas exchanges in the soil. The SRS-SD1000 is an ultra compact, easy to use, affordable research instrument. Despite weighing only 2kg, it provides accurate soil flux measurements and 10 hours of battery life.  TheSRS-SD2000 is a sophisticated portable soil respiration system that allows the user to dynamically control both CO2 and H2O inside the measurement chamber. This allows soil flux to be determined at different CO2 concentrations, whilst the ability to dry air within the chamber facilitates research into soils of high moisture content. The standard 0-3000ppm CO2 range is suitable for working with soils with extremely high levels of CO2 flux. This makes the SRS-SD2000 the ideal instrument for experiments into soils with high rates of bacterial respiration or those affected by intensive organic inputs.

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