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Automated Monitoring of Soil Respiration

A Moving Chamber Design

Environmental Sciences Division, Oak Ridge National Lab., Oak Ridge, TN 37831-6422

View larger version (40K): [in a new window]   Fig. 1. A drawing of the soil respiration chamber shown in the open position.

View larger version (14K): [in a new window]   Fig. 2. Soil CO2 efflux rates as affected by changing the size of the intake opening on the chamber.

View larger version (27K): [in a new window]   Fig. 3. Air temperatures and soil temperatures at the 8-cm depth in both the open and closed positions. Temperatures with the chamber closed were recorded during the last minute of a 14-min period of chamber closure. Temperatures with the chamber open were recorded approximately 1 hr after the chamber was opened. Soil respiration rates from the same chamber are also shown.

View larger version (19K): [in a new window]   Fig. 4. Soil moisture changes over a 7-mo period in 2001 inside the automated chambers (n = 4) and adjacent to the chambers (n = 12). Values are means and standard errors.

View larger version (35K): [in a new window]   Fig. 5. Soil respiration and soil temperature recorded every 110 min over an 8-wk period beginning in mid-September, 2001. Data are means of four automated soil chambers. Standard error bars are shown at periodic time intervals for the automated system. Also shown are the means and standard errors (n = 12) of five point-in-time measurements taken with a closed system infrared gas analyzer (IRGA) adjacent to the soil chambers.

View larger version (17K): [in a new window]   Fig. 6. A comparison of soil respiration rates measured with the automated open flow system and the stationary closed-loop system. Each data point represents the mean rates measured with the automated chambers (n = 4) and the mean rates manually measured with stationary chambers (n = 12) during the same time period.