Characterization of heavy metal content in soil of dendrocalamus latiflorus and their origins in the main production areas of Guangxi

ObjectiveTo investigate the content of heavy metals in dendrocalamus latiflorus and soil of origin in the main production areas of dendrocalamus latiflorus in Guangxi， and to analyse their distribution characteristics.MethodsA total of 115 soil samples of dendrocalamus latiflorus and 115 samples of dendrocalamus latiflorus were collected in the four main dendrocalamus latiflorus production areas of Nanning， Guilin， Liuzhou and Baise in Guangxi. As， Hg， Cd， Mn， Ba， Ni， Cu， Cr， Pb and Ti as 10 heavy metal elements in dendrocalamus latiflorus and soil samples were analyzed. The pollution of heavy metals in soil of origin was analyzed by the single-factor pollution index method and the Nemero composite pollution index method， and the correlation between heavy metals in jatropha dendrocalamus latiflorus and heavy metals in soil of origin and bioconcentration factor （BCF） was explored.ResultsAll heavy metals in 115 dendrocalamus latiflorus samples did not exceed the limit values. In the soil samples from the production area， 16.5%， 3.5%， 0.9% and 1.7% of Cd， As， Cr and Ni respectively exceeded the risk screening values specified in the standard， while the elements Hg， Pb and Cu did not exceed the risk screening values， and the contamination index indicated that there was no obvious heavy metal contamination of the soil in the main production area of dendrocalamus latiflorus. The results of the correlation analysis showed that there were various complex correlations between the contents of each heavy metal element in dendrocalamus latiflorus and the contents of heavy metal elements in the soil of the corresponding origin. Jatropha shoots were generally weakly enriched for heavy metals （BCF<0.05）， with only Cu and Cd being relatively higher than the other elements.ConclusionNone of the heavy metal contents in dendrocalamus latiflorus exceeded the limit values， and no obvious heavy metal contamination was seen in the soil of the origin， and there were many complex correlations between the heavy metals in dendrocalamus latiflorus and the heavy metal contents in the soil of the origin.

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