The soil Cd and Pb risk threshold based on quality safety of Panax notoginseng
To ensure green planting and quality safety of Panax notoginseng,the soil risk threshold of Panax notoginseng safety pro-duction in China was discussed.Physicochemical properties of soil,content and available contents of Cd and Pb in soil,and contents of Cd and Pb in the main root of Panax notoginseng were analyzed.The relationship between Cd,Pb in the main root of Panax notogin-seng and soil physical and chemical properties as well as total and available Cd,Pb in soil was analyzed by linear correlation analysis.The regression equation between total available Cd,Pb in soil and Cd,Pb in the main root of Panax notoginseng was established by the regression model,and the soil available Cd and Pb threshold was inversely estimated.The results showed that the over standard rates of Cd and Pb in soil samples were 83.64％and 16.36％,respectively.The soil Cd pollution was serious and the soil Pb was at a clean level.The Pb content in the main root of Panax notoginseng did not exceed the standard,and the exceeding rate of Cd content was 29.09％.Soil pH was negatively correlated with Pb in the main root of Panax notoginseng.There was a significant positive correla-tion and a extremely significant positive correlation between Cd in the main root of Panax notoginseng and the soil Cd content and the soil available Cd,respectively.Pb in the main root of Panax notoginseng was significantly positively correlated with Pb content and available Pb in soil.Based on the limitation standard of Cd and Pb in the main root of Panax notoginseng,the threshold value of soil available Cd and soil available Pb was 0.27 mg/kg and 70.66 mg/kg,respectively.
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