TABLE 2.

Depth-integrated net rates of NO₃⁻ consumption and production

Treatment conditions	Depth interval (mm)	Rate of nitrification, denitrification, or assimilation (mmol of NO3− m−2 h−1)	Activity
104 μM NO3−, light	0.0–1.8	0.35	Assimilation
104 μM NO3−, light	2.0–4.2	0.36	Nitrification
104 μM NO3−, light	4.4–6.4	0.26	Denitrification
104 μM NO3−, dark	0.7–2.4	0.20	Denitrification
27 μM NO3−, light	0.0–0.7	0.24	Assimilation
27 μM NO3−, light	0.7–2.1	0.23	Nitrification
27 μM NO3−, light	2.1–2.7	0.18	Denitrification
27 μM NO3−, dark	0.4–1.8	0.08	Denitrification