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Long-term Effects of Tillage and Corn Stalk Return on Soil Carbon Dynamics

^a Dep. of Ecology and Evolutionary Biology, University of Connecticut, 75 N. Eagleville Rd., U-3043, Storrs, CT 06269
^b Dep. of Plant Science, University of Connecticut, 1376 Storrs Rd., U-4067, Storrs, CT 06269

View larger version (29K): [in a new window]   Fig. 1. Soil organic C expressed as (A) concentration (g C kg–1 soil) or (B) mass (Mg C ha–1 soil) for no-till (NT) or conventional (moldboard plow) tillage (CT) with residues returned (+) or residues removed (–). Error bars represent standard error. Means with the same letter are not significantly different at a probability of 0.05. Statistics performed separately for the 0- to 15-cm depth.

View larger version (31K): [in a new window]   Fig. 2. Relic C3-C expressed as (A) concentration (g C kg–1 soil) or (B) mass (Mg C ha–1 soil) for no-till (NT) or conventional (moldboard plow) tillage (CT) with residues returned (+) or residues removed (–). Error bars represent standard error. Means with the same letter are not significantly different at a probability of 0.05. Statistics performed separately for 0- to 15-cm depth.

View larger version (21K): [in a new window]   Fig. 3. Corn-derived C4-C expressed as (A) concentration (g C kg–1 soil) or (B) mass (Mg C ha–1 soil) for no-till (NT) or conventional (moldboard plow) tillage (CT) with residues returned (+) or residues removed (–). Error bars represent standard error. Means with the same letter are not significantly different at a probability of 0.05. Statistics performed separately for the 0- to 15-cm depth.

View larger version (15K): [in a new window]   Fig. 4. Corn C inputs and corn-derived C remaining in upper 15 cm of soil after 28+ yr of continuous management for no-till (NT) or conventional (moldboard plow) tillage (CT) with residues returned (+) or residues removed (–). Error bars represent standard error. Error bars are not included for "corn input over 28 yr" because values were estimated from yield data. Means with the same letter are not significantly different at a probability of 0.05.