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Maize Residue Decomposition Measurement Using Soil Surface Carbon Dioxide Fluxes and Natural Abundance of Carbon-13

^a Dep. of Biological Sciences, Univ. of Lethbridge, 4401 University Dr., Lethbridge, AB, Canada, T1K 3M4

View larger version (24K): [in a new window]   Fig. 1 (a) Soil temperature at 10 cm and (b) soil water content in the 5- to 25-cm layer during the 1997 growing season in control, no-till, and moldboard-plowed plots. Error bars indicate standard deviations (n = 4)

View larger version (26K): [in a new window]   Fig. 2 Total soil respiration during the 1997 growing season in control, no-till, and moldboard-plowed plots. Error bars indicate standard deviations (n = 4)

View larger version (13K): [in a new window]   Fig. 3 Total soil respiration as a function of soil temperature at 10 cm in (a) control, (b) no-till, and (c) moldboard-plowed plots. Open squares indicate the measurements made during the 2 wk following rototillage of the control plots on Day 167. Open triangles indicate measurements made during the period when soil water content was below 0.15 m3 m-3 (Day 200–225)

View larger version (22K): [in a new window]   Fig. 4 Carbon isotope ratio of soil CO2. Error bars indicate standard deviations (n = 4)

View larger version (19K): [in a new window]   Fig. 5 Contribution of the decomposition of maize crop residues to the total soil respiration during the 1997 growing season in no-till and moldboard-plowed plots. Error bars indicate standard deviations (n = 4)

View larger version (24K): [in a new window]   Fig. 6 Decomposition rates of the maize residues during the 1997 growing season in no-till and moldboard-plowed plots. Error bars indicate standard deviations (n = 4)

View larger version (18K): [in a new window]   Fig. 7 Decomposition rate of the maize residues as a function of soil temperature at 10 cm in (a) no-till and (b) moldboard-plowed plots. Open triangles indicate measurements made during the period when soil water content was below 0.15 m3 m-3 (Day 200–225)

View larger version (19K): [in a new window]   Fig. 8 Cumulative decomposition of maize residues during the 1997 growing season in no-till and moldboard-plowed plots. A total of 520 g m-2 of residue C was returned to the field in the fall of 1996. Error bars indicate standard deviations (n = 4)

View larger version (25K): [in a new window]   Fig. 9 Microbial biomass C in the 15-cm surface soil layer during the 1997 growing season in control, no-till, and moldboard-plowed plots. Error bars indicate standard deviations (n = 4)

View larger version (11K): [in a new window]   Fig. 10 Decomposition rate of the maize residues as a function of the microbial biomass C derived from maize. The regression equation does not include the data point for no-till Day 253