Silver Ecotoxicity Estimation by the Soil State Biological Indicators

Table 1

Change in environmental indicators of soils in the south of Russia with silver pollution over 10 days of the experiment.

Soil type	The silver content in the soil, mg/kg
	Control	1	10	100	LSD0.05
The total number of bacteria, billion in 1 g of soil
Ordinary chernozem	5.1	4.5	3.9	2.6	0.3
Sierosands	2.8	2.1	1.7	1.4	0.2
Brown forest soil	1.9	1.5	1.0	0.9	0.1
LSD0.05		0.3	0.2	0.2
Catalase activity, ml O2per 1 g of soil for 1 min
Ordinary chernozem	11.3	10.7	10.4	10.1	0.9
Sierosands	2.9	2.5	2.3	2.1	0.2
Brown forest soil	2.9	2.4	2.3	2.1	0.2
LSD0.05		0.4	0.4	0.4
The activity of dehydrogenases, mg TFF per 10 g of soil in 24 hours
Ordinary chernozem	26.1	25.1	23.6	11.6	2.2
Sierosands	21.5	18.1	13.2	12.8	1.7
Brown forest soil	20.7	16.3	12.0	8.6	1.5
LSD0.05		2.1	1.7	1.2
Length of the radish roots, %
Ordinary chernozem	100	95	92	83	11
Sierosands	100	99	88	76	12
Brown forest soil	100	95	76	71	10
LSD0.05		10	9	8
Integral indicator of the biological state of soils, %
Ordinary chernozem	100	97	90	73	11
Sierosands	100	87	73	61	10
Brown forest soil	100	85	70	58	9
LSD0.05		11	9	8