. 2014 May 8;20(8):2644–2662. doi: 10.1111/gcb.12558

Table 2.

Carbon stocks and changes in the organic layer C pool for the first (NFSI I) and second (NFSI II) National Forest Soil Inventory under different substrate groups and forest stand types

Substrate	Tree species	C stocks NFSI I		C stocks NFSI II		ΔC	ΔC (UC)
Substrate	Tree species	n	[Mg ha⁻¹]	N	[Mg ha⁻¹]	[Mg ha⁻¹ yr⁻¹]	[Mg ha⁻¹ yr⁻¹]
1	CF	148	26.2 ± 1.2^a	152	28.5 ± 1.0^b	0.15 ± 0.08	0.11
1	MF	5	19.6 ± 7.2^a	5	11.2 ± 5.7^a	−0.62 ± 0.15	0.23
2	DF	100	8.0 ± 0.6^a	102	5.9 ± 0.5^a	−0.14 ± 0.04	0.07
	CF	216	21.5 ± 0.8^a	183	24.9 ± 1.0^a	0.23 ± 0.07	0.09
	MF	77	17.1 ± 1.2^a	79	17.2 ± 1.6^a	0.00 ± 0.11	0.10
3	DF	79	5.7 ± 0.4^a	95	4.5 ± 0.3^b	−0.09 ± 0.03	0.03
	CF	77	14.3 ± 0.6^a	50	9.6 ± 0.9^b	−0.30 ± 0.06	0.08
	MF	74	10.4 ± 0.7^a	78	6.1 ± 0.5^b	−0.28 ± 0.05	0.08
4	DF	116	10.7 ± 0.8^a	106	8.3 ± 0.6^b	−0.18 ± 0.06	0.07
	CF	342	26.4 ± 0.7^a	334	25.5 ± 0.7^b	−0.08 ± 0.05	0.07
	MF	187	18.9 ± 0.9^a	180	16.2 ± 1.0^b	−0.17 ± 0.06	0.08

n, number of observations; UC, uncertainty; 1, Dystrophic loose substrates; 2, Eutrophic loose substrates; 3, High base saturation; 4, Low base saturation; DF, Deciduous forest; CF, Coniferous forest; MF, Mixed forest.

± indicating variation by standard errors.

Different letters indicate a 0.05 significance level, tested by a two-way anova and the attended Tukey HSD test for each substrate group individually.