The investigated parameters of the soil samples Rough sand ( 2,0 - 0,2 mm) Fine sand ( 0,2 –0,02 mm ) Dust ( 0,02 – 0,002 mm ) Colloid clay ( sub 0,002 mm ) Physical clay ( sub 0,01 mm ) pH in water Carbonate ( CaCO 3 ) Humus Phosphorus mobile ( P mobile ) recalc pH Potassium mobile (K mobile ) Zinc Copper Manganese Nickel Cadmium Iron Lead Physical-chemical parameters Biochemical parameters Microbiological parameters E1Phosphatase E2β-glucosidase E3Cellobiohydrolase E4 β-xylosidase E5Trypsin-like protease E6Chymotrypsin-like protease E7Palmitoyl-esterase E8Chitinase 1.Species richness of bacteria 2. Species richness of fungi 3. Diversity of important bacterial genera 4. Diversity of toxinogenic fungi

Physical-chemical parameters (processed with Excel and OpenStat softwares) pH

Physical-chemical parameters Humus

Physical-chemical parameters Phosphorus In the Romanian soils the amount of P is frequently much less in the lower layer than in the upper layer.

Physical-chemical parameters Potassium In the Romanian soils the amount of K is frequently much less in the lower layer than in the upper layer.

Physical-chemical parameters Cadmium

Physical-chemical parameters Copper

Physical-chemical parameters Zinc

Physical-chemical parameters Lead

Physical-chemical parameters Manganese

Physical-chemical parameters Iron

P-mobile – K-mobile regression in the Romanian soil samples X versus Y Plot X = VAR1, Y = VAR2 from file: Temporary.TEX Variable Mean Variance Std.Dev. VAR VAR Correlation = , Slope = 2.73, Intercept = Standard Error of Estimate = Number of good cases = 20

P-mobile – K-mobile regression in the Romanian soil samples X versus Y Plot X = VAR1, Y = VAR2 from file: Temporary.TEX Variable Mean Variance Std.Dev. VAR VAR Correlation = , Slope = 2.73, Intercept = Standard Error of Estimate = Number of good cases = 20

Multiple regression of heavy metals in the Romanian samples Variables Cu Mn Ni Cd Pb Zn Cu Mn Ni Cd Pb Zn Correlation matrix

Multiple regression of heavy metals in the Romanian samples