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Atmospheric CO2 Flux

Project Goal
Our overall goal is to quantify the interannual variability of carbon sequestered in key rainfed and irrigated crop production systems of the region.

Project Description
Our group studies the exchange of carbon dioxide between the surface and the atmosphere. We make year-round measurements of uptake and release of carbon dioxide in each field using tower eddy covariance flux systems. Such measurements are needed in calculating the annual carbon dioxide budget for each field.

Equipment

            
            

Figure 1. Schematic of eddy covariance tower and close up of the eddy covariance flux sensors (right).

                                         
                                         

Figure 2. Sensor measuring different components of solar radiation.

Figure 3. Sensors measuring interception of solar radiation by the crop canopy.

Figure 4. Sensors measuring soil temperature and soil heat flux.

Progress
Atmospheric fluxes (uptake or release) of carbon dioxide, at the landscape-level, are being measured year-round at the three study sites [a) irrigated continuous maize, b) irrigated maize-soybean rotation, and c) rainfed maize-soybean rotation].  Seasonal distributions of daytime CO2 uptake and nighttime CO2 release in these agricultural production fields are being examined.  Environmental/biophysical factors which control these CO2 fluxes are being evaluated, and annual carbon budgets are being constructed.

Figure 5. Landscape-level CO2 flux (uptake / release).

Staff
Shashi Verma Professor, School of Natural Resources, UNL

Andy Suyker Research Assistant Professor, School of Natural Resources, UNL


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