TABLE 3.

Rates of nitrification and NO₃⁻ reduction in sediment enriched with differentially ¹⁵N-labeled NH₄NO₃^a

Carbon treatment	mg of N produced liter−1 day−1 by:
	Nitrification	NO3− reduction
Control	0.06	1.10
Glycine	0.04	1.64
Acetate	0.01	0.30
Formate	0.00	0.00
Glucose	0.08	2.57

^aRates of nitrification and NO₃⁻ reduction (averaged over 48 h) were measured during incubation with sediment enriched with differentially ¹⁵N-labeled NH₄NO₃ and supplemented with different carbon substrates at 1.0 g of C liter⁻¹.