Abstract：
Phosphorus (P) plays an important role in immobilizing heavy metals (HMs), thereby preventing their accumulation, especially in edible parts of crops. In this study, vermicompost (VM) and chemical fertilizers (CFs) were used as soil amendments to increase the available P concentration in soil contaminated with cadmium (Cd) and nickel (Ni), with the aim of reducing their bioavailability, uptake, and bioaccessibility. Using CF and VM as soil amendments substantially increased the available P and exchangeable potassium concentrations in the soil. Furthermore, VM addition led to an increase in OM content and in exchangeable calcium and magnesium, resulting in the improved growth of lettuce. It also reduced the uptake of Cd and Ni in the two lettuce cultivars tested in the study. However, CF addition boosted the accumulation of Cd and Ni by increasing the soil acidity. CF addition, and especially VM addition, altered the chemical forms of Cd and Ni from active to inactive. Overall, the results of this study underscore the positive impact of using VM as a soil amendment on lettuce growth and the prevention of HM accumulation in edible parts of lettuce. VM addition led to decreased bioavailability, uptake, and bioaccessibility of HMs in soil, which could improve food safety and reduce potential risks associated with HM contamination.
摘要：
磷（P）在固定重金属（HMs）中起着重要作用，从而防止它们的积累，尤其是在作物的可食用部分。在这项研究中,vermicompost（VM）和化学肥料（CFs）被用作土壤改良剂，以增加镉（Cd）和镍（Ni）污染的土壤中的有效磷浓度。为了降低它们的生物利用度，摄取，和生物可及性。使用CF和VM作为土壤改良剂可显着增加土壤中的有效磷和可交换钾浓度。此外，添加VM导致OM含量和可交换钙和镁的增加，导致生菜生长的改善。它还降低了研究中测试的两个生菜品种对Cd和Ni的吸收。然而,CF的添加通过增加土壤酸度来促进Cd和Ni的积累。CF加法，特别是VM添加，改变了Cd和Ni的化学形式从活性变为非活性。总的来说,这项研究的结果强调了使用VM作为土壤改良剂对生菜生长和防止生菜可食用部分HM积累的积极影响。添加VM导致生物利用度降低，摄取，以及HMs在土壤中的生物可及性，这可以提高食品安全，降低与HM污染相关的潜在风险。
