Investigation and accumulation characteristics of cadmium in Pueraria planting area of Jiangxi Province

In order to understand the content of heavy metal cadmium in the soil and plants of Pueraria planting areas, we conducted a field investigation combined with laboratory analysis for 18 areas of artificial Pueraria in Jiangxi Province, and revealed the accumulation characteristics transportation of cadmium by Pueraria; with an aim to provide theoretical basis for safety and quality control technology of Pueraria.The results showed that the available and total cadmium contents in the soil were 0.002~0.21 and 0.05~0.25 mg·kg^-1 respectively.The cadmium content in Puerariae, root and aboveground parts, main vine, lateral branch and leaf were 0.002~0.28, 0.14~1.38, 0.07~1.83, 0.04~1.80 and 0.05~1.91 mg·kg^-1 in the survey area, respectively.Pueraria, root and aboveground parts, main vine, lateral branch and leaf/soil enrichment coefficients were 0.97, 5.30, 5.84, 4.14 and 2.05, respectively.Root and aboveground parts, main vine, lateral branch and leaf/Pueraria translation coefficients were 11.64, 8.54, 6.16 and 3.56, respectively.The content of cadmium in different parts was in the order of main vine(0.71 mg·kg^-1)> root and aboveground parts (0.58 mg·kg^-1)>lateral branch(0.51 mg·kg^-1)> leaf (0.28 mg·kg^-1)>Puerariae(0.11mg·kg^-1), and the cadmium content in the main vine was significantly higher than that in the leaf and Puerariae(P < 0.05).Correlation analysis showed that soil available cadmium and total cadmium were significantly positively correlated with main vine, lateral branch and leaf.Pueraria was significantly positively correlated with root and aboveground parts, main vine and lateral branch.Considering soil cadmium content, cadmium content in Pueraria, transport coefficient and enrichment characteristics combined with cluster analysis, we concluded that the cadmium content in Pueraria was with the highest in areas such as Yushui, Xingguo and Dexing, while Yongfeng, Nancheng, Poyang and Shanggao was with lower values; Pueraria was with a strong enrichment effect on the heavy metal cadmium, so the area with high soil environmental quality would be selected to avoid high-risk planting areas.