Table 2.

Spearman's rank correlation matrix of soil properties. Soil pH, bulk density, total N (NO₃ + NH₄), % N, % organic C and C : N ratios from table 1; N₂O emission rates in soil cores with (N⁺) and without (N⁻) added KNO₃ shown in figure 1; nirK, nirS, nosZ gene abundance from qPCR as in figure 2.

16S rRNA	1	1.00
% N	2	0.50*	1.00
% organic C	3	0.50*	1.00***	1.00
C : N	4	0.20	0.90***	0.90***	1.00
N2O (N−)	5	0.70**	0.90***	0.90***	0.70**	1.00
N2O (N+)	6	0.10	0.70**	0.70**	0.90***	0.40	1.00
total N	7	0.70**	0.90***	0.90***	0.70**	1.00***	0.40	1.00
bulk density	8	−0.45	−0.89***	−0.89***	−0.89***	−0.67*	−0.89***	−0.67*	1.00
nirK	9	0.50*	1.00***	1.00***	0.90***	0.90***	0.70**	0.90***	−0.89***	1.00
nirS	10	−0.10	−0.70**	−0.70**	−0.50*	−0.60*	−0.20	−0.60*	0.45	−0.70**	1.00
nosZ	11	−0.30	−0.10	−0.10	−0.30	0.00	−0.60*	0.00	0.45	−0.10	−0.60*	1.00
pH	12	0.10	−0.30	−0.30	−0.50*	−0.40	−0.30	−0.40	0.11	−0.30	0.00	0.10	1.00
		1	2	3	4	5	6	7	8	9	10	11	12

*p<0.1; **p<0.05; ***p<0.01.