Table 3.

Control-background (C-bkgrd) remineralization rates μmol C ml⁻¹_ws day⁻¹ and OM reactivity (k × 10⁻⁴ day⁻¹) of the different sediment used: average under oxic (ox) and anoxic (anox) conditions

Sediment sample (cm)	C-bkgrd OM Remineral		Bkgrd OM reactivity (k)		Percentage of tracer carbon respired				Enhanced OM decomposition
									Percentage of tracer remineralization				Percentage of bkgrd remineralization
	Ox	Anox	Ox	Anox	Ox		Anox		Ox		Anox		Ox		Anox
					1×	10×	1×	10×	1×	10×	1×	10×	1×	10×	1×	10×
Subtidal 0–2	0.26	0.21	4.4	3.7	19	26	16	23	393	108	531	27	8	29	10	7
Subtidal 18–20	0.08	0.13	0.9	1.6	11	15	20	25	11	51	300	62	0.4	25	12	31
Intertidal 0–2	0.44	–	16.3	–
Day 7					19.7		–		120	–			22	–
Day 14					29.9		–		91	–			14	–
Day 21					33.2		–		119	–			15	–

Also given is the percent of the tracer OM respired in the different treatments that received a single low (1×) and tenfold (10×) load of tracer amendment

In the last column, enhanced OM decomposition (priming of indigenous OM) is presented as both percentage of tracer carbon respired and as percentage of C-background OM remineralization rates, again with 1× versus 10× addition under oxic and anoxic conditions

All values are average of n = 3