Soil Carbon Accumulation and CO₂ Flux in Experimental Restoration Plots, Southern Iceland: Comparing Soil Treatment Strategies

Table 1

Summary results of soil carbon analysis and soil CO₂ flux measurements. = 50 for control and lupine; = 75 for grass and GBW (grass-birch-willow). Mean shown ± standard error. SD = standard deviation. Soil carbon stock calculated as kg m⁻² elemental carbon. CO_2soil measurement in μmol m⁻² sec⁻¹.

Treatment		A Csoil %	B Csoil %	Soil C stock	CO2soil
Control	Mean	0.35 ± 0.02	0.36	0.43 ± 0.02	0.59 ± 0.06
	SD	0.11		0.14	0.58
	Range	0.13–0.58		0.20–1.06	0.01–2.65
Grass	Mean	0.48 ± 0.02	0.38	0.33 ± 0.01	0.52 ± 0.04
	SD	0.18		0.11	0.33
	Range	0.28–1.11		0.02–0.62	0–1.67
GBW	Mean	0.64 ± 0.03	0.52	0.5 ± 0.02	0.49 ± 0.06
	SD	0.24		0.18	0.48
	Range	0.34–1.32		0.25–1.21	0–3.73
Lupine	Mean	0.67 ± 0.03	0.61	0.65 ± 0.03	2.9 ± 0.23
	SD	0.23		0.21	1.61
	Range	0.18–1.23		0.26–1.22	0.28–7.06