论文部分内容阅读
Mercury(Hg)contents in ten chemical fertilizers were determined,and the effect of calcium superphosphate(CSP)on the uptake and translocation of Hg in c seedlings was investigated by pot experiments.CSP was applied at the levels of 0,66.7,and 133.4 mg P2O5/kg to Hg-treated(2 mg/kg)and untreated soils.CSP had the highest Hg content(5.1 mg/kg),followed by the NPK compound fertilizer 15-5-5(15% N,5% P2O5,5% K2O)(1.2 mg/kg),then by nitrogen fertilizers(except for ammonia sulfate)and potassium fertilizers.Application of CSP did not obviously influence the biomass of c roots,but it significantly increased the biomass of c shoots in Hg-treated soil Application of CSP at the levels of 66.7 and 133.4 mg P2O5/kg did not obviously influence the uptake of Hg by c seedlings on soils without Hg treatment,but it decreased the Hg uptake of c seedlings significantly on Hg-treated soils.The transfer coefficient of Hg in c seedlings improved slightly on soils without Hg treatment,but decreased slightly on Hg-treated soils with the application of CSP.These results implied that CSP could ameliorate Hg toxicity to c seedlings by inhibiting the uptake and the translocation of Hg in plants on Hg-polluted soils.