Fig 1.
Number of the soil samples in the collected data records
Table 1.
Statistical information of the heavy metal pollution rate.
Table 2.
Percentages of the data records with the pollution rates in different ranges.
Table 3.
Pearson correlation coefficients between pollution rates of heavy metals in arable soil.
Table 4.
The averages of heavy metal pollution rates in the non-ferrous mining and smelting areas (%).
Table 5.
The averages of heavy metal pollution rates in the non-metallic mining and smelting areas (%).
Fig 2.
Heavy metal pollution rates from potential sources.
Fig 3.
Pollution rate of farmland soil by heavy metals on a provincial scale
Fig 4.
Percentages of affected grain production in each province accounting for the total grain production in China.