The Variations in the Soil Enzyme Activity, Protein Expression, Microbial Biomass, and Community Structure of Soil Contaminated by Heavy Metals

Table 2

The Pearson correlation coefficients between the microbial parameters and the concentrations of heavy metals.

	Acid phosphatase	Dehydrogenase	Microbial biomass C	Protein
Cu
CaCl2	−0.500	−0.597*	−0.632*	−0.705*
EDTA	−0.576*	−0.628*	−0.834**	−0.884**
DTPA	−0.568	−0.649*	−0.839**	−0.874**
Total	−0.586 *	−0.594 *	−0.729 **	−0.866 **
Zn
CaCl2	−0.400	−0.584*	−0.604*	−0.543
EDTA	−0.554	−0.685*	−0.683*	−0.596*
DTPA	−0.613*	−0.734**	−0.748**	−0.698*
Total	−0.531	−0.680 *	−0.716 **	−0.653 *
Pb
CaCl2	−0.239	−0.485	−0.303	−0.219
EDTA	−0.586*	−0.709**	−0.624*	−0.643*
DTPA	−0.719**	−0.760**	−0.583*	−0.669*
Total	−0.569	−0.693 *	−0.604 *	−0.645 *
Cd
CaCl2	−0.379	−0.515	−0.551	−0.542
EDTA	−0.486	−0.544	−0.679*	−0.814**
DTPA	−0.425	−0.539	−0.726**	−0.794**
Total	−0.528	−0.494	−0.576 *	−0.817 **

Note: **correlation is significant at the 0.01 level (2-tailed).
*Correlation is significant at the 0.05 level (2-tailed).