The importance of accounting method and sampling depth to estimate changes in soil carbon stocks

Table 6 Crediting outcomes of calculating SOC stocks with ESM versus FD at 0–15, 15–30, and 30–60 cm, using BCarbon’s “difference between means” methodology

Experiment	Treatment	ESM depth (cm)	ESM 50% LCL^a (t CO2_e ha⁻¹)	FD 50% LCL^a (t CO2_e ha⁻¹)	Number of credits for 50 ha field over 20 year crediting period using ESM	Number of credits for 50 ha field over 20 year crediting period using FD
Century Maize	CMT	0–15	−0.16	−16.59	0	0
	CMT	15–30	−2.53	−10.26	0	0
	CMT	30–60	−12.68	−15.26	0	0
	CMT + WCC	0–15	13.37	−3.07	668	0
	CMT + WCC	15–30	2.11	−8.98	105	0
	CMT + WCC	30–60	−20.34	−25.60	0	0
	OMT	0–15	33.74	13.03	1687	651
	OMT	15–30	13.56	3.70	678	185
	OMT	30–60	0.41	8.42	21	421
Century Wheat	IW	0–15	1.59	−7.09	80	0
	IW	15–30	−3.00	−9.78	0	0
	IW	30–60	−2.71	1.62	0	81
	IW + N	0–15	2.60	−9.73	130	0
	IW + N	15–30	−1.88	−4.30	0	0
	IW + N	30–60	−6.09	2.81	0	141
	RW	0–15	−7.02	−20.48	0	0
	RW	15–30	−4.16	−5.57	0	0
	RW	30–60	−8.10	−0.21	0	0
	RW + N	0–15	0.36	−15.26	18	0
	RW + N	15–30	−3.79	−1.90	0	0
	RW + N	30–60	−2.78	5.64	0	282
	RW + WCC	0–15	1.13	−14.38	56	0
	RW + WCC	15–30	−1.21	−3.53	0	0
	RW + WCC	30–60	−14.08	−5.40	0	0
WICST	Maize	0–15	−49.19	−39.73	0	0
	Maize	15–30	−50.56	−48.77	0	0
	Maize	30–60	−59.55	−66.60	0	0
	MS	0–15	−16.97	11.03	0	551
	MS	15–30	−32.17	−32.20	0	0
	MS	30–60	−17.74	−37.10	0	0
	MSW	0–15	−28.51	−14.50	0	0
	MSW	15–30	−31.26	−30.01	0	0
	MSW	30–60	−32.08	−42.12	0	0
	MAAA	0–15	−8.63	−2.57	0	0
	MAAA	15–30	−31.66	−34.30	0	0
	MAAA	30–60	−27.31	−30.00	0	0
	MOA	0–15	−9.32	0.12	0	6
	MOA	15–30	−21.53	−27.29	0	0
	MOA	30–60	−26.26	−28.80	0	0

ISSN: 1750-0680