Values of biological factors.

BAC1 (Biological Accumulation Coefficient) the ratio of THg concentration in S. virgaurea to its concentration in soil (0–0.2 m); BAC2 (Biological Accumulation Coefficient) the ratio of THg concentration in Poaceae sp. to its concentration in soil (0–0.2 m); EFsoil (Enrichment Factor), relative abundance of a chemical element in a soil compared to the relative abundance respect to local background (50 μg kg-1); EFprof (Enrichment Factor) in soil profile Hg soil (0–0.2 m)/Hg soil(0.2–0.5 m); MF (Mobility ratio) expresses the ratio of metal concentration in soil (0–0.2 m),to its concentration groundwater Values of biological factors.