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Flush of Carbon Dioxide Following Rewetting of Dried Soil Relates to Active Organic Pools

^a USDA–ARS, J. Phil Campbell Sr. Nat. Resour. Conserv. Cent., 1420 Experiment Station Rd., Watkinsville, GA 30677 USA
^b Dep. of Soil and Crop Sci., Texas A&M Univ. and Texas Agricultural Experiment Stn., College Station, TX 77843 USA
^c USDA–ARS, New England Plant, Soil, and Water Lab., Orono, ME 04469 USA

View larger version (39K): [in a new window]   Fig. 1 Typical responses of cumulative C mineralization and rate of C mineralization following rewetting of dried soil in soils with various quantities of available C (VL is very low, L is low, M is medium, H is high, and VH is very high). Basal-soil respiration is achieved at 10 d. Dashed lines indicate the C mineralized due to fumigation at 10 d. The inset magnifies the rate of C mineralization with time

View larger version (21K): [in a new window]   Fig. 2 Relationship of C mineralization during 0–3 d with C mineralization during 0–1 d in four soils from Texas

View larger version (35K): [in a new window]   Fig. 3 Relationships of C mineralization during 0–3 d with C mineralization during 0–24 d in soils from Alberta–British Columbia, Maine, Texas, and Georgia. Lower panels are magnifications of the 0 to 500 mg kg-1 range in CMIN0-3d for each of the four regions

View larger version (38K): [in a new window]   Fig. 4 Relationships of C mineralization during 0–3 d with soil microbial biomass C in soils from Alberta–British Columbia, Maine, Texas, and Georgia. Lower panels are magnifications of the 0 to 500 mg kg-1 range in CMIN0-3d for each of the four regions. Dashed lines in the Alberta–British Columbia subpanel indicate regression lines of whole soil (upper line, r2 = 0.87) and aggregate fractions (lower line, r2 = 0.85)

View larger version (38K): [in a new window]   Fig. 5 Relationships of C mineralization during 0–3 d with net N mineralization during 0–24 d in soils from Alberta–British Columbia, Maine, Texas, and Georgia. Lower panels are magnifications of the 0 to 500 mg kg-1 range in CMIN0-3d for each of the four regions

View larger version (36K): [in a new window]   Fig. 6 Relationships of C mineralization during 0–3 d with particulate and total organic C in soils from Alberta–British Columbia, Maine, Texas, and Georgia