中文摘要：

采用盆栽试验研究了模拟Cr、Pb、cd、Hg、Co复合污染对长药景天生理的影响及其对重金属的吸收。结果表明，在低浓度污染下，长药景天的CAT和SOD活性显著增高，但在中、高浓度污染下。CAT和SOD活性显著下降。所有浓度梯度污染处理均使POD活性下降。叶绿素含量增加，蛋白质含量下降，而可溶性糖含量无变化。MDA含量在高浓度污染胁迫下显著升高。随土壤中重金属含量的增加，长药景天根系中重金属含量增加，但Cr和Pb向地上部分迁移很少，而Cd、Hg和Co向地上部分迁移的能力较强．其中低浓度污染条件下，根、叶、果穗中Hg的富集系数都在1以上，Hg含量以叶片中最高，其次是果穗。长药景天对Co的富集能力较强，在轻、高污染条件下，其根、叶和果穗对Co的富集系数均大于1，长药景天的果穗对几种重金属的富集系数相对较高。

英文摘要：

The physiological responses and metal absorption in combined treatment of chromium, lead, eadium, mercury and cobalt by the plant of Sedum spectabile Boreau were studied in pot experiments in the experimental garden of Shenyang Normal University,Liaoning province, China. The results showed that CAT and SOD activity increased at low concentration of metal treatment while decreased significantly at medium and high metal concentration treatment. All the treatments with different concentrations could cause the decrease of POD activity, increase of content of chlorophyll and decrease of content of protein. The contents of MDA increased under sever heavy metal stress. No significant difference in content of soluble sugar was obtained. With the increasing of heavy metal, the content of metal in roots increased. Cr and Pb were seldom transported to the aboveground parts after the metal was absorbed by root, Cd, Hg and Co could be easily transported to aboveground parts relatively. The bio-concentration factor （BCF） for Hg in root, leaf and spike was above 1.0 at low concentration treatment and the peak value of the content of Hg existed in leaf. The BCF for Co was above 1 in root, leaf and spike at low and high metal concentration treatment. The BCF for all the metals was relatively high in spike.