Table 1 Effects of eCO₂ on soil properties at both depths

		Moisture	NO₃⁻-N	NH₄⁺-N	Total nitrogen	Total carbon
		(%, w/w)	(mg/kg)	(mg/kg)	(w/w, %)	(%, w/w)	TC/TN ratio
0–5 cm	aCO₂	24.0 ± 2.5^B	1.28 ± 0.11^A	30.4 ± 2.82^A	0.164 ± 0.011^A	2.43 ± 0.192^A	15.23 ± 0.90^A
	eCO₂	24.1 ± 2.7^b	0.89 ± 0.06^b	36.4 ± 4.07^a	0.165 ± 0.013^a	2.12 ± 0.148^a	13.85 ± 0.61^a
	P	0.712	0.030	0.418	0.328	0.042	0.813
5–15 cm	aCO₂	36.5 ± 2.7^A	1.04 ± 0.07^B	32.61 ± 1.90^A	0.155 ± 0.008^A	2.24 ± 0.258^A	13.37 ± 0.79^A
	eCO₂	38.5 ± 2.4^a	2.52 ± 0.59^a	31.34 ± 2.50^a	0.148 ± 0.007^a	1.91 ± 0.101^a	13.04 ± 0.51^a
	P	0.037	0.023	0.267	0.879	0.823	0.615

Soil variables from each depth were analyzed separately and significances between treatments (aCO₂ and eCO₂) or two soil depths were tested by t-test at the P< 0.05 level. A and B indicate significant changes between depths for aCO₂ and a and b for eCO₂.

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