Fig 1.
Location of study area and sampling sites.
Table 1.
Classification criteria of potential ecological risk index.
Table 2.
Statistical summary of heavy metal concentrations in vegetable bases (mg/kg).
Fig 2.
Results of eight heavy metal geo-accumulation index.
(a. The black line and bar, lower and upper edges, bars and forks in or outside the boxes represent median and mean values, 25th and75th, 5th and 95th percentiles of all data, respectively; b. Percentage of sites at different pollution level).
Fig 3.
Environmental quality evaluation of vegetable bases soils.
a. Results of potential ecological risk assessment; b. Spatial distribution of the RI in the vegetable bases.
Fig 4.
Relationship between the observed and predicted heavy metal concentration by the PMF method.
Fig 5.
Source profiles and source contributions of soil heavy metal from PMF.
(a. factor 1; b. factor 2; c. factor 3; d. factor 4; e. factor 5; f. the mean contribution rate (%) of 5 factors).
Fig 6.
Spatial distribution of the different source intensities of heavy metals in the soil.