A Study on Heavy Metals Pollution in Soil and Fruits of Rosa roxburghii Tratt from the Planting Bases Located in the Karst Areas of Guizhou Province

Abstract

Both single pollution index and integrated pollution index methods were employed in the present research to assess the heavy metals pollution of soil in the threeRosa roxburghii TrattPlanting Bases (located in Qianxi County and Qixingguan region in Bijie, Longli County in Qiannan), the baseline values of heavy metals in soils in Guizhou Province, Environmental Quality Standard for Soils (GB15618-1995) and Conditions of Green Food-tech0.nical Environmental Quality for Production Area (NY/T391-2000 and GB/T18407.1-2001) were applied as references. National Food Safety Standard-Contaminants in foods was applied to evaluateRosa roxburghii Trattfruits. The results suggest that the studied soil samples conformed to Environmental Quality Second Level Standard for Soils and Green Food-technical Conditions. The overall quality of the soil conditions was uncontaminated, but point source pollution phenomenon existed. Hg, Pb and Cu pollution were the main factors contributing to the rise in comprehensive pollution index from the threeRosa roxburghii TrattPlanting bases. It was found that levels of As and Cu did not exceed the limited standard of the soil，while Hg, Cr, Cd and Pb exceeded the standard in different degrees in studiedRosa roxburghii Trattplanting bases. The rates of excessive quota of Hg, Cr, Cd and Pb in the studiedRosa roxburghii Trattfruits was 6.67%, 13.33%, 73.33% and 100%, respectively. The mean accumulation coefficient of Cd forRosa roxburghii Trattfruits was up to 1.20. The mean accumulation coefficients for concerned heavy metals were in the order of Cd > Cu > Pb > Hg > As> Cr. The relationships between concentrations of heavy metals in soil, leaf and stem samples were weak. However, significant correlations were found between concentrations of As in soil and leaf samples (r = 0.928), and concentrations of Cr between in soil samples and Cr in leaf samples (r = 0.733).