The Effect of Heavy Metal on Red soil-Packchoi(Brassica chinensis) System around Different Enterprises

Bioavailability and transformation of heavy metals in soils and its effect on the trait of vegetable around the polluting enterprises characterized by electroplating,chemical and iron steel industry in Nanchang peri-urban areas were discussed in this paper.The results indicated that Cu content of 53.57% and Cd content of 100% in the soil samples exceeded the second grade of Standards for Soil Environmental Quality of China.The main fractionations of the heavy metals in the soil were the residual form and Fe-Mn oxide combined form.The fractionation of soluble and exchangeable form which could be easily absorbed by plant was small.Cu content in pakchoi was below the Hygienic Standards for Food Security of P.R.China,while Cd content of 7.14% in the vegetable was above the standards(n=28).In addition,there was significant correlation between the soil and packchoi system.We selected some samples to analyze the trait index,whose physiochemical properties were approximately same.The results indicated that the moisture content in the pakchoi was determined by the nutrient and the moisture content in soil.The content of chlorophyll and peroxides(POD) in the plant can indicate stress of the Cu and Cd in the soils.