. 2021 Dec 6;18(23):12848. doi: 10.3390/ijerph182312848

Table 1.

Correlations (Pearson’s) among STN and its fractions in 0–10 and 10–20 cm soil depths.

Parameter ^a	STN	PON	MBN	DON	NO₃⁻	NH₄⁺
0–10 cm
STN	1
PON	0.952 **	1
MBN	0.795 **	0.861 **	1
DON	0.800 **	0.747 **	0.631 *	1
NO₃^–	0.903 **	0.933 **	0.802 **	0.845 **	1
NH₄⁺	0.728 **	0.795 **	0.805 **	0.789 **	0.896 **	1
10–20 cm
STN	1
PON	0.901 **	1
MBN	0.752 **	0.839 **	1
DON	0.760 **	0.692 *	0.621 *	1
NO₃⁻	0.934 **	0.883 **	0.848 **	0.889 **	1
NH₄⁺	0.844 **	0.842 **	0.802 **	0.561	0.787 **	1

^a STN, soil total N; PON, particulate organic N; MBN, microbial biomass N; DON, dissolved organic N. ** Significant at p < 0.01, * Significant at p < 0.05.