College of Resources and Environmental Engineering, Guizhou University, Guiyang, People's Republic of China.
College of Agriculture, Guizhou University, Guiyang, People's Republic of China.
Environ Technol. 2022 Jan;43(1):10-20. doi: 10.1080/09593330.2020.1772375. Epub 2020 Jun 9.
The high geological background of heavy metal cadmium (Cd) in geochemical anomaly areas in Southwest China and the anthropogenic pollution superposition effect in some typical areas due to mining exploitation have attracted special attention for several decades. The accumulation and migration of Cd in the farmland soil-crop system was worth discussing. In this study, the representative yellow soil and limestone soil in Guizhou Province, as well as three types of pepper (Capsicum annuum L.) were selected to investigate Cd accumulation and migration regulation from soil to plants using pot tests at different Cd concentration levels. For red cluster pepper, line pepper and hybrid pepper, the accumulation capacity of Cd in various parts was similar as follows: Cd > Cd ≈ Cd > Cd. The differences in the Cd concentration between pepper varieties were as follows: Cd in line pepper roots was higher than that in red cluster pepper and hybrid pepper, but for leaves and fruits, the Cd concentration of red cluster pepper was higher than the others. A higher accumulation and lower transport capacity of Cd in yellow soil as well as a lower accumulation and higher transport capacity of Cd in limestone soil were achieved based on the results of enrichment coefficients and transport coefficients in yellow soil. The red pepper Cd concentration was higher than that of the other two types. The accumulation and transformation of Cd for peppers in yellow soil is more significant ( < 0.05), which results in a higher risk of migration through the food chain.
中国西南部地球化学异常区重金属镉（Cd）的高地质背景，以及采矿开发等一些典型地区人为污染的叠加效应，几十年来一直受到特别关注。农田土壤-作物系统中 Cd 的积累和迁移值得探讨。本研究采用不同 Cd 浓度水平的盆栽试验，选择贵州省有代表性的黄壤和灰岩土，以及 3 种辣椒（Capsicum annuum L.），研究 Cd 从土壤向植物的积累和迁移规律。对于红辣椒、线辣椒和杂交辣椒，各种部位对 Cd 的积累能力相似，即 Cd>Cd≈Cd>Cd。不同辣椒品种间 Cd 浓度的差异为：线辣椒根中的 Cd 含量高于红辣椒和杂交辣椒，而叶片和果实中的 Cd 浓度则高于其他品种。根据黄壤的富集系数和迁移系数的结果，黄壤中 Cd 的积累能力较高，迁移能力较低，而灰岩土中 Cd 的积累能力较低，迁移能力较高。红辣椒的 Cd 浓度高于其他两种类型。黄壤中辣椒对 Cd 的积累和转化更为显著（<0.05），这导致通过食物链迁移的风险更高。
