关键词: 蔬菜营养, 硝酸盐, 无公害蔬菜

Abstract: Heavy metal cadmium (Cd) is a very toxic element ubiquitous in the environment. The Cd in soil is easily absorbed by plants, and consequently, produces adverse effects on human health through food chain. Owing to the fact that the Cd transfer in soil-plant system and the adverse effects of Cd on human health are influenced by the interactions between Cd and some other metal elements, e.g., Ca, Cu, Fe, and Zn, the study on the mechanisms of the influences of these elements on Cd transfer through food chain and the accumulation of Cd in human body becomes a hotspot. In this study, a survey was performed on the vegetable field in a Cd-contaminated area in Guangxi. The results showed that in contaminated area, the concentrations of Cd, Ca, Cu, Fe, Pb, and Zn in vegetables were obviously higher than those in uncontaminated area, and different vegetable varieties had greater differences in the absorption and accumulation of Cd, Cu, Pb, and Zn. The transferring ability of these four metal elements in soil-plant system was Cd>Zn>Cu>Pb, and the transfer of Cd was affected by the elements in coexistence.

Key words: Vegetable nutrition, Nitrate, Non-pollution vegetables