Alluvial soils are rich in mineral nutrients, and contain high heavy metals, especially Cd. The interactions of mineral nutrients with Cd in soil-rice grain systems on natural condition of alluvial plain are highlighted in this study. 110 pairs of rice grain and soil (0–20 cm) samples from the Pearl River Delta were investigated and measured. The results indicated that pH, organic matter, cation exchange capacity, clay, Ca, Cd, Fe, Mn and Zn are the most important soil characteristics controlling Cd uptake by rice grain. There are synergetic interactions between Cd and mineral elements in the soils, and antagonistic interactions between them in the rice grains. It could provide useful information for the risk assessment of heavy metals in the soils of alluvial plain.

冲积土壤富含矿物质营养，并含有高重金属，尤其是镉。本研究重点研究了冲积平原自然条件下土壤-稻谷系统中矿质养分与镉的相互作用。调查并测量了来自珠江三角洲的110对稻谷和土壤样品（0-20厘米）。结果表明，pH，有机质，阳离子交换容量，黏土，Ca，Cd，Fe，Mn和Zn是控制水稻籽粒吸收Cd的最重要土壤特征。土壤中Cd和矿质元素之间存在协同作用，而稻谷中Cd与矿物质之间存在拮抗作用。它可以为冲积平原土壤中重金属的风险评估提供有用的信息。