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Environmental Controls on Soil and Whole-ecosystem Respiration from a Tallgrass Prairie

^a Loch Lomond, Watkinsville, GA 30677-2345
^b USDA–ARS, J. Phil Campbell Sr., Natural Resource Conservation Center, 1420 Experiment Station Road, Watkinsville, GA 30677-2373
^c USDA–ARS, 5601 Sunnyside Avenue, Beltsville, MD 20705-5140

View larger version (21K): [in a new window]   Fig. 1. Mean soil respiration and whole-ecosystem respiration in relationship with soil organic C content. Each point represents the mean of 79 observations during 2 yr.

View larger version (33K): [in a new window]   Fig. 2. Soil temperature and water-filled pore space measured during 1987 and 1988. Error bars represent standard deviation among five replicates for each sampling point.

View larger version (35K): [in a new window]   Fig. 3. Variances of soil respiration, whole-ecosystem respiration, soil temperature, and water-filled pore space when observations were separated from 1 to 29 d apart from each other in 1987. Vertical lines mark the points of inflection that occurred at 10 and 20 d of separation. Regression lines are polynomial expressions.

View larger version (43K): [in a new window]   Fig. 4. Soil respiration and whole-ecosystem respiration measured during 1987 and 1988. Predicted respiration was from the combined years multiple regression in Table 2 for soil respiration and in Table 3 for whole-ecosystem respiration. Error bars represent standard deviation among 5 replicates for each sampling point.

View larger version (33K): [in a new window]   Fig. 5. Effect of changes in soil temperature at three levels of water-filled pore space (m3 m-3) on soil respiration (a) and whole-ecosystem respiration (d). Effect of changes in water-filled pore space at three levels of soil temperature on soil respiration (b) and whole-ecosystem respiration (e). Effect of plant growth rate as a function of day of year on soil respiration (c) and whole-ecosystem respiration (f) in 1987 and 1988. Regression coefficients for parameters are in Table 2 for soil respiration and in Table 3 for whole-ecosystem respiration.

View larger version (21K): [in a new window]   Fig. 6. Observed soil respiration at a nearby prairie location during 1996 to 1997 (Bremer et al., 1998) and predicted values from the combined years regression equation in Table 2.

View larger version (25K): [in a new window]   Fig. 7. Calculated aboveground plant dark respiration in 1987, 1988, and predicted from the difference in combined years regression equation between whole-ecosystem and soil respiration.