中文摘要：

红树植物一般生长于海滩,桐花树作为一种较普遍的红树植物物种,其在红树植物修复实验的研究中具有一定的代表性。本文将生长在河海交汇处（洛阳屿头）的桐花树树苗移入实验室,分别用浓度为Cr^6＋2.5mg/L、3.5mg/L、5.3mg/L,Ni^2＋1.0mg/L、2.5mg/L、5.0mg/L,Cu^2＋0.5mg/L、1.0mg/L、2.0mg/L的人工废水进行培养,在植株生长良好的前提下,浓度为Cr^6＋2.5mg/L、Ni^2＋5.0mg/L、Cu^2＋2.0mg/L培养下的植株修复效果良好,Cr^6＋、Ni^2＋、Cu^2＋在植物体内分布情况：根〉叶〉枝;Cu^2＋在桐花树在植物体内的富集系数相对其它元素最大,其次是Ni^2＋;该实验结果为今后研究红树植物用于河流、湖泊湿地系统提供一些参考。

英文摘要：

As a common mangrove plant which grows naturally along the beach, pittosporum tree has a certain representation in the field of mangrove restoration. In this experiment, the tree seedlings transplanted from the river confluence reaches were planted in artificial sewages. The ionic concentrations inside are outperformed as follow： Cr^6＋ 2.5mg/L, 3.5mg/L, 5.3mg/L, Ni^2＋ 1.0 mg/L, 2.5mg/L, 5.0mg/L, Cu^2＋ 0.5 mg/L, 1.0mg/L, 2.0mg/L. The results showed that： trees planted under the ionic concentrations of Cr^6 ＋ 2.5 mg/L, Ni^2＋ 5.0 mg/L, Cu^2 ＋ 2.0 mg/L exhibited better purifying effects. The conterntrationt order of Cr^6 ＋ , Ni^2 ＋ , Cu^2 ＋ in the plants are： roots〉 leaves〉 stems. Compared to the other two elements, accumulation coefficient of Cu^2＋ in pittosporum trees was the highest. And Ni^2＋ comes follow. This experiment was set out to provide some references for future study of mangrove plants applying in rivers, lakes, wetland system.