Effect of cadmium stress on growth, absorption, and accumulation in green manure “Chafei 1#”

The growth, absorption, and accumulation of Chafei 1# (Cassia sophera) under different cadmium (Cd) concentrations (0, 5, 10, 20, 40, 80, 120, 160 mg·kg-1) were investigated using the pot experiment. The results showed that upon adding 0~160 mg·kg-1 Cd in soil, the growth of various organs were significantly inhibited along with increasing concentrations of Cd. There were significant positive correlations between Cd content in organs and Cd stress, and Cd content in organs and available Cd content (P<0.05). The order of Cd content in various organs was root>stem>leaf; in addition, most of the Cd was fixed by the roots in the soil, so less Cd was transported from the soil to the upper part, indicating that the roots of Chafei 1# were vulnerable to Cd toxicity. Although the Chafei 1# was treated with a high concentration of Cd, in a short time, there was an obvious enrichment in Cd as Cd stress increased, as the content in the root, stem, and leaf were 113.85, 20.15, and 7.0 mg·kg-1, respectively. Therefore, Chafei 1# could be planted in polluted areas as soil remediation plants, which are of great significance to environmental protection and in control measures for polluted cultivated land.