Table 3 Ecological risks from soil heavy metals in wheat and maize cropping systems.

From: Heavy metal ecological-health risk assessment under wheat–maize rotation system in a high geological background area in eastern China

Cropping system

Traffic source

Agricultural source

Industrial source

Natural source

Total

Wheat cropping system

11.82

10.73

10.53

10.20

43.28

Proportion

27.30%

24.80%

24.33%

23.57%

100.00%

Maize cropping system

19.26

16.87

27.94

14.39

69.13

Proportion

24.55%

21.50%

35.61%

18.34%

100.00%

Wheat–Maize

15.54

13.80

19.24

12.30

56.21

Proportion

27.65%

24.55%

34.22%

21.87%

100.00%

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