International Scholarly Research Notices

Research Article

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

Table 1

Selected soil physicochemical properties and the soil concentrations of heavy metals.


	CK			Distance from the smelter
Soil number				800 m			400 m			200 m
	1	2	3	1	2	3	1	2	3	1	2	3

pH	5.94	5.76	5.72	7.57	7.34	6.23	6.61	8.00	6.56	6.52	6.95	7.10
Organic matter (%)	4.76	5.36	4.69	4.06	4.64	3.23	6.84	5.42	6.21	7.65	6.78	6.13

Cu (mg·kg⁻¹)
CaCl₂	0.10	0.05	0.05	0.17	0.28	0.17	0.68	0.68	0.33	1.54	0.81	0.65
DTPA	4.45	4.78	5.16	33.41	48.67	21.59	124.29	85.39	102.08	138.29	129.54	110.12
EDTA	8.13	8.05	8.72	83.51	107.06	36.40	200.03	143.65	154.78	293.92	238.30	200.66
Total	52	46	46	314	414	175	711	746	511	1147	794	624

Zn (mg·kg⁻¹)
CaCl₂	0.96	0.93	1.14	0.46	0.44	5.93	12.32	8.44	8.74	46.02	20.69	13.48
DTPA	3.44	3.75	4.46	18.36	25.56	17.83	55.86	62.40	41.71	179.49	148.50	139.94
EDTA	5.33	5.69	6.77	43.45	63.33	30.84	75.43	121.80	63.59	680.38	394.31	468.81
Total	116	113	111	260	364	187	599	596	545	2472	1456	1421

Pb (mg·kg⁻¹)
CaCl₂	0.60	0.65	0.57	0.59	0.59	0.57	0.58	0.59	0.63	0.70	0.61	0.60
DTPA	3.38	4.21	4.25	6.46	13.06	5.58	25.79	89.79	23.99	71.09	101.70	78.98
EDTA	8.60	9.73	9.56	16.79	29.97	10.68	71.45	169.41	56.51	360.61	233.78	174.38
Total	83	76	75	94	176	77	281	616	230	1199	770	557

Cd (mg·kg⁻¹)
CaCl₂	0.04	0.05	0.05	0.03	0.04	0.28	0.31	0.24	0.25	0.55	0.30	0.19
DTPA	0.22	0.21	0.21	0.35	0.69	0.57	1.63	1.13	1.41	1.73	1.15	0.99
EDTA	0.23	0.24	0.24	0.50	0.99	0.78	1.92	1.79	1.65	2.32	1.45	1.25
Total	1.29	1.52	1.14	2.54	4.17	3.16	5.82	7.26	5.29	7.15	4.79	4.11

Cr (mg·kg⁻¹)
CaCl₂	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.
DTPA	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.
EDTA	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.	N.D.
Total	96	115	115	108	154	116	67	63	75	44	73	87

Note: values presented in the table are the arithmetic mean of three replicates. N.D.: not detected.