| 摘要 |
[Objectives] To analyze the current status of heavy metal contamination in soils of vegetable cultivation bases located in Huichuan District, Zunyi City. [Methods] Soil samples from various depths within the vegetable cultivation bases of Guanba Village, Sidu Village, and Banqiao Village in Huichuan District, Zunyi City, were selected as the subjects of this study. The concentrations of five heavy metals, including lead (Pb), mercury (Hg), cadmium (Cd), arsenic (As), and chromium (Cr), were measured at different soil depths. The Nemerow comprehensive pollution index method was employed to assess heavy metal contamination, and the analysis was conducted in accordance with the farmland environmental quality evaluation standards for edible agricultural products. [Results] The concentrations of Cd and As at the sample collection sites were relatively elevated. The pollution level of Cd reached grade III or above, indicating moderate contamination in certain topsoil areas. Most As concentrations corresponded to grade II and grade III pollution levels. In contrast, Hg, Pb, and Cr concentrations remained within the safety standards established for agricultural products. However, Cd and As levels predominantly surpassed these safety thresholds. Notably, Guanba Village and Sidu Village exhibited significant pollution levels, warranting comprehensive investigations into the sources of contamination. [Conclusions] This study offers valuable insights for advancing the sustainable development of local agriculture and for the prevention and management of soil contamination. |
