Use of ^𝟏𝟓N Natural Abundance and N Species Concentrations to Assess N-Cycling in Constructed and Natural Coastal Wetlands

Table 2

Characteristics of sediment organic matter for Grave’s Dock (GD), Chechessee Marsh (CM), and Oyster Rake (OR).

Site	Month	Depth (cm)	N (%)	𝛿^15N (‰)	C (%)	𝛿^13C (‰)	C : N
GD	Jan	0–10	0.22	3.6	2.52	−19.7	11.76
		30–40	0.18	3.8	2.33	−19.5	12.66
	Apr	0–10	0.25	3.7	2.68	−20.1	10.87
		30–40	0.20	4.0	2.48	−20.5	12.16
	Oct	0–10	0.20	4.2	2.42	−20.4	12.14
		30–40	0.21	4.6	2.49	−19.9	12.08
CM	Jan	0–10	0.09	3.6	1.14	−19.4	12.81
		30–40	0.11	4.1	1.47	−19.5	13.67
	Apr	0–10	0.17	4.0	2.36	−18.5	13.66
		30–40	0.15	3.7	2.15	−19.8	14.78
	Oct	0–10	0.16	4.2	1.82	−19.3	11.34
		30–40	0.11	4.7	1.49	−19.9	13.38
OR	Oct	0–10	0.01	2.8	0.13	−25.8	15.06
		20–30	0.02	0.6	0.44	−26.4	19.30