AUTOMATED MEASUREMENTS OF GREENHOUSE GAS EMISSIONS FROM SOILS WITH RADAR-BASED ESTIMATES OF SOIL MOISTURE IN AGRICULTURE & FOREST ECOSYSTEMS
Northern Great Plains Research Laboratory
2013 Annual Report
1a.Objectives (from AD-416):
Quantify differences in measurement methods by comparing manual with automated chamber techniques using new Quantum Cascade Lasers (QCL) and Wavelength-Scanned Cavity Ring Down Spectroscopy (WS-CRDS) for wetland/cropland/rangeland mixed-use agricultural ecosystems.
1b.Approach (from AD-416):
We will set up arrays of probes in mixed-use agricultural sites to continuously and manually monitor gas fluxes, soil moisture and soil temperature. Manual measurements will be collected weekly and compared with automated data collection chambers.
The second phase of this project was successfully completed through the collection of gas flux data using manual and automated gas collection systems. During this phase manual gas flux measurements were made once or twice per week while gas flux measurements via the automated system were made continuously using a quantum cascade laser (QCL). Applicable biotic and abiotic parameters (e.g., biomass production, soil moisture, and soil temperature) were collected concurrently with gas flux measurements. In June 2013 the QCL was returned to Woods Hole Research Center. Data analyses for manual and automated gas flux measurements are currently underway.
Monitoring of performance for this project was conducted by regular teleconferences with the Cooperator’s PI, at project meetings, and in frequent email contacts.