CADMIUM AVAILABILITY AND UPTAKE BY RAPE (BRASSIA CAMPESTRIS L.) GROWN IN CONTAMINATED SOILS APPLIED WITH ORGANIC AMENDMENTS

Soil cadmium (Cd) pollution has become a serious environmental focus of attention of the worldwide. Cd availability in soils and uptake by rape (Brassia campestris L.) grown in Cd-contaminated soils after supplied the mixture of wheat or corn straw and chicken manure as organic amendments (labeled as WC and CC) into soils were studied. Results showed that WC amendments application generally promoted the dry matter of rape tissues at the first 50 days and significantly improved antioxidant enzymes activity of rape leaves regardless of planting period. Application with WC amendment might be more advantageous in decreasing Cd uptake by rape than CC amendment. It was worth mentioning that Cd contents in roots, stems and leaves reduced by 50.84% and 63.14% at the second 50 days when supplied WC amendment of 12.0g kg-1 of TOC into soils. Application with WC amendment could effectively decline the Cd availability on account of the Cd form redistribution from exchangeable Cd to unavailable Cd. Additionally, significantly negative correlations (P