| A pot experiment was set up to test the remediation effects in a Cu and Cd contaminated soil by applying of apatite（dosages of 0.6% and 1.2%） and lime（dosages of 0.2% and 0.4%）. The results showed that soil solution and soil pH was significantly increased with application of lime and apatite, and both followed the order 0.4% lime>0.2% lime>1.2% apatite>0.6% apatite>control. The content of soil solution Cu and Cd and availability Cu and Cd in soil apparently decreased with application of apatite and lime, and the decrease magnitude increased with increasing dosages of lime and apatite. With application of lime and apatite, biomass of Pennisetum sp. increased, and content of Cu and Cd in above part and root decreased. The highest biomass of in above part（61.45 g） and root（10.31 g） of Pennisetum sp.were found in 0.4% lime treated soil. Our results showed that apatite is more sustainable to sustain low availability of Cu and Cd with increasing simulation time than that in lime treated soil. However, lime at the dosage of 0.4% is more effective to remove heavy metal by uptake of Pennisetum sp. than that in apatite treated soil. |
