Environmental
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Introduced in 2003, the LI-8100 Automated Soil CO2 Flux System provides researchers sophisticated flux monitoring instrumentation in a dedicated system that is integrated and easy to use. The LI-8100 System provides unparalleled versatility with two short-term survey and two long-term chambers available, in addition to the ability to multiplex up to 16 long-term chambers. Modular by design, the LI-8100 System's flexibility allows researchers to build custom systems from a selection of available components. |
Survey System
The inherent spatial heterogeneity of soils means that a soil CO2 flux
reading taken at one location could be significantly different from a reading taken even meters away.
The Survey configuration provides a way to rapidly take measurements in multiple locations in order to
calculate a spatial average. The system is quickly and conveniently moved from collar
to collar to "survey" flux rates over a larger area of interest.
A Survey system is comprised of the LI-8100 Analyzer Control Unit (ACU) and one of two Survey Chambers: 8100-102 (10 cm diameter) and 8100-103 (20 cm diameter). The system can be conveniently carried by the user - the ACU comes with a shoulder strap, and each chamber is lightweight and comes with a handle. A soil temperature sensor is included with Survey chambers, and a soil moisture sensor is optional - readings from these auxiliary sensors are integrated into the dataset. Power is provided by an onboard, rechargeable battery. The user can easily configure and monitor the system on a PDA while out in the field using the Wireless Communications Package (recommended). Data can be stored either on internal flash memory or a Compact Flash card (included). |
Single Chamber Long-Term System
In addition to spatial heterogeneity, soils also exhibit both diurnal and seasonal patterns of variation in
CO2 evolution due to changes in soil water content,
temperature, soil organic carbon resources, etc. In order to capture these long term patterns, measurements must be
made continuously for days, weeks, even months at a time. The LI-8100 and Long-Term Chambers were designed to be
deployed, unattended, for these extended periods of time.
A Single Chamber Long-Term configuration is comprised of the LI-8100 Analyzer Control Unit (ACU) and one of two Long-Term Chambers: 8100-101 and 8100-104. Both chambers are automated to move away from the measurement collar when not taking a measurement, minimizing perturbations to the natural microclimate at the measurement site. Soil temperature and moisture sensors are optional - readings from these auxiliary sensors are integrated into the dataset. The Analyzer Control Unit's weatherproof box is designed for long-term field deployment. DC power, provided by the user, is wired into a weather-tight box on the side of the ACU. The user can configure the system with a PC or the optional Wireless Communications Package. Data is stored on a removable Compact Flash card (included). |
Multiplexed Long-Term System
To satisfy both temporal and spatial resolution requirements of soil CO2 flux
monitoring with one system, a multiplexed solution is required. The Multiplexed LI-8100 System can integrate measurements from up to
16 chambers into a single dataset, enabling a spatial average to be calculated as well as capturing long-term variation in
soil CO2 flux rates.
A Multiplexed Long-Term configuration is comprised of the LI-8100 Analyzer Control Unit (ACU), the LI-8150 Multiplexer, and either 8100-104 or 8100-101 Long-Term Chambers. Both chambers are automated to move away from the measurement collar when not taking a measurement, minimizing perturbations to the natural microclimate at the measurement site. Soil temperature and moisture sensors are optional and can be connected at each chamber - readings from these auxiliary sensors are integrated into the dataset. The LI-8100 and LI-8150 weatherproof boxes are designed for long-term field deployment. DC power can be provided by the user, or the system can be powered with an optional AC Power Supply. The user can configure the system with a PC or the optional Wireless Communications Package. Data is stored on a removable Compact Flash card (included). Multiplexed System packages and chamber discounts are available. |
