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. 2012 May 5;367(1593):1235–1244. doi: 10.1098/rstb.2011.0314

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.