《Table 3 Calculation of soil heavy metal thresholds for safe planting of pakchoi》

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《"Derivation of soil Pb/Cd/As thresholds for safety of vegetable planting: A case study for pakchoi in Guangdong Province,China"》

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**and***denote significance at the 0.01 and 0.001 levels，respectively.

A total of 18 top layer soils（0–20 cm）of vegetable fields covering a wide variation in Pb/Cd/As concentrations were collected as the potting soils mainly from three main vegetable production cities of Shenzhen，Dongguan and Shaoguan in Guangdong Province.The soil physical and chemical properties and the Pb/Cd/As concentrations were shown in Table 1.The soil pH values ranged from 4.87 to6.34 and organic matter contents varied from 14.44 to 32.04 g kg-1，suggesting typical acidic soils in South China.