TABLE 2.

Rates of acetylene reduction in microcosms containing sediment samples from PS

Treatment	Avg acetylene reduction rate (C2H4 nmol gdm−1 h−1) ± SDa
Unamended	25 ± 2.2
NH4+c	9.3 ± 0.81
ATUd	BDLb
NH4+ + ATU	0.60 ± 0.020

^aAssays were performed in triplicate.

^bBDL, below detection limit. The detection limit for C₂H₄ is 25 pmol gdm⁻¹ hour⁻¹.

^cNH₄⁺ represents NH₄(T) added as NH₄Cl at a 1 mM final concentration.

^dATU was used at a 1 mM final concentration.