TABLE 3.

Multiple regression analysis including C_org, pH, and NO₃ as independent factors

Parameter	Standardized coefficient (β)a			Model P value
	Corg	pH	NO3−
DNA yield	0.881***	0.017	−0.050	0.000
16S rRNA level	0.827***	−0.065	0.113	0.000
narG level	0.400*	0.694***	0.023	0.005
nirK level	0.689***	−0.272*	0.000	0.000
nirS level	0.065	0.077	0.275	0.381
nosZ level	0.697***	−0.244	−0.149	0.000

^aSignificance levels (P) of the multiple regression model are as follows: *, P < 0.05; ***, P < 0.001.