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Influence of Soil Moisture and Land Use History on Denitrification End-Products

^a W.K. Kellogg Biological Station and Dep. of Crop and Soil Sciences, Michigan State Univ., 3700 E. Gull Lake Drive, Hickory Corners, MI 49060
^b Dep. of Geological Sciences, 206 Natural Science Building, Michigan State University, East Lansing, MI 48823

View larger version (29K): [in a new window]   Fig. 1. Volumetric mixing ratios of nitrous oxide during soil incubations with C2H2 (arrows) or without. Successional incubations (left panels) show similar patterns regardless of moisture history. For short-wet cropped soil (lower right) accumulation of N2O only (no arrow) was only slightly less than total denitrification (with arrow) in marked contrast to long-wet cropped soil (upper right). Error bars represent standard errors (n = 3).

View larger version (28K): [in a new window]   Fig. 2. Summary of N gas production. Total denitrification (N2O + N2 by C2H2 inhibition) is represented by the height of bars. The N2O production (in the absence of C2H2) is represented by the shaded area. The N2 production is inferred by difference (unshaded area). Even though total denitrification did not differ significantly between moisture histories for cropped soils, the short-wet incubations produced significantly more N2O and less N2. Error bars represent standard error of total denitrification and N2O production (n = 3).

View larger version (20K): [in a new window]   Fig. 3. Isotopic character of N2O in labeled jars at the end of incubations (with ambient N2O for reference). Filled and open symbols represent long-wet and short-wet treatments, respectively; shape corresponds to replicate. Points lying on or near the equilibrium curve indicate samples approximately in isotopic equilibrium with respect to 15N distribution among molecular masses, suggesting derivation from an isotopically uniform pool. Higher effective enrichment of successional soils relative to cropped soils reflects a smaller contribution from native soil NO-3.