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Soil Respiration in a Subtropical Savanna Parkland: Response to Water Additions

^a Dep. of Plant & Soil Science, N-222D Ag. Sci. North, Univ. of Kentucky, Lexington, KY 40546-0091
^b Dep. of Rangeland Ecology and Management, Texas A&M Univ., College Station, TX 77843-2126
^c School of Natural Resources, Univ. of Arizona, Tucson, AZ 85721-0043

View larger version (28K): [in this window] [in a new window]   Fig. 1. Mean (±1 SD) volumetric soil moisture (0–10-cm depth) and daily soil temperature (5-cm depth) for control and irrigated plots in each plant community type.

View larger version (34K): [in this window] [in a new window]   Fig. 2. Diurnal soil respiration curves for control and irrigated plots in each plant community type from the first month of water application (July 1996), a cold month (February 1997), and a hot month 1 yr after continuous irrigation (July 1997). Data are means ± 1 SE. Mean daily soil temperature (ST, °C) averaged across plant communities is shown for each sampling period and treatment.

View larger version (21K): [in this window] [in a new window]   Fig. 3. Seasonal pattern of daily soil respiration rates in control and irrigated plots for each plant community type. Data are means ± 1 SD.

View larger version (37K): [in this window] [in a new window]   Fig. 4. Relationship between daily soil respiration, volumetric soil moisture (0–10-cm depth), and soil temperature (0–5-cm depth) from (a) control and (b) irrigated plots in all plant community types during the study.