Abstract：
Elucidating the absorption and translocation of heavy metal(loid)s by common vegetables across different growth environments and stages is crucial for conducting accurate environmental risk assessments and for associated control. This study investigated temporal variations in the absorption and translocation capacities of pak choi (Brassica rapa L.) for As, Cd, Cr, Cu, Pb, and Zn in polluted soils during the plant growth cycle under greenhouse and open-field cultivation modes. Results showed high root metal(loid) bioconcentration factors and root-to-shoot translocation factors for Cd (0.25 and 1.44, respectively) and Zn (0.26 and 1.01), but low values for As (0.06 and 0.88) and Pb (0.06 and 0.87). The Cd concentration in the aerial edible parts peaked during the early slow growth period, whereas other heavy metal(loid)s peaked during the later stable maturity period. Root bioconcentration and root-to-shoot translocation factors did not significantly differ between cultivation modes. However, greenhouse cultivation exhibited lower average Cd and Zn concentrations in the edible parts and cumulative uptake amounts of most metal(loid)s than open-field cultivation during the typical harvest period spanning days 60 and 90. Short-term transitioning from open-field to greenhouse cultivation may reduce health risks associated with heavy metal(loid) intake via pak choi consumption. These findings facilitate sustainable agricultural practices and food safety management.
摘要：
阐明普通蔬菜在不同生长环境和阶段对重金属（类）的吸收和转运对于进行准确的环境风险评估和相关控制至关重要。这项研究调查了白菜（BrassicarapaL.）对As的吸收和转运能力的时间变化，Cd,Cr,Cu,Pb,在温室和露地栽培模式下，植物生长周期中污染土壤中的锌和锌。结果表明，Cd（分别为0.25和1.44）和Zn（0.26和1.01）的根金属（类）生物富集因子和根至茎易位因子较高，但As(0.06和0.88)和Pb(0.06和0.87)的值较低。地上可食用部分的Cd浓度在早期缓慢生长期间达到峰值，而其他重金属(loid)在后期的稳定成熟期达到顶峰。种植模式之间的根生物富集和根-茎易位因子没有显着差异。然而,在60天和90天的典型收获期，温室栽培在可食用部分中的平均Cd和Zn浓度以及大多数金属（类）的累积吸收量均低于露天栽培。从露天种植到温室种植的短期过渡可能会减少与通过小白菜摄入重金属（类）相关的健康风险。这些发现促进了可持续农业实践和食品安全管理。
