Nitrogen and Carbon Cycling in a Grassland Community Ecosystem as Affected by Elevated Atmospheric CO₂

Table 2

Effect of atmospheric CO₂ concentration on soil C mineralization during a 60-day soil incubation at three soil depth increments^†.

CO2 level	0–20 days			20–40 days			40–60 days
	Depth
	0–20 cm	20–50 cm	50–80 cm	0–20 cm	20–50 cm	50–80 cm	0–20 cm	20–50 cm	50–80 cm
(𝜇mol mol^−1)	(mg kg^−1)
385	57.52 a	63.94 a	36.84 a	59.15 a	67.15 a	59.44 a	210.76 a	263.46 a	229.40 a
690	92.86 a	41.98 a	66.94 a	100.55 b	55.80 a	72.29 a	199.20 b	217.40 a	246.32 a
980	87.93 a	70.15 a	34.26 a	124.98 c	42.52 a	69.40 a	417.46 c	169.43 a	256.82 a

^†Values represent means of three replications. Means within a column for each sampling date followed by the same letter do not differ significantly (𝛼=0.1).