10.6084/m9.figshare.5213092.v1 R. Ma R. Ma X. Zhou X. Zhou J. Shi J. Shi Heavy metal contamination and health risk assessment in Critical Zone of Luan River Catchment in the North China Plain Geological Society of London 2017 P 2 profiles Luan River Catchment forest method content graph parameter Critical Zone P 1 health risk assessment maize importance Heavy metal contamination North China Plain manganese Gini index Geology 2017-07-17 14:32:03 Journal contribution https://geolsoc.figshare.com/articles/journal_contribution/Heavy_metal_contamination_and_health_risk_assessment_in_Critical_Zone_of_Luan_River_Catchment_in_the_North_China_Plain/5213092 These graphs quantitatively describe importance of thirteen parameters for manganese, iron and lead content in maize for P1 and P2 profiles using the Gini index of random forest method.