保定市河道公路绿化树种毛白杨的抗重金属能力

Resistance of Heavy Metal in Populus tomentosa along Stream Highway

对保定市河道公路不同年龄毛白杨根际土壤重金属及毛白杨各器官SOD活性、POD活性、CAT活性、叶绿素含量以及细胞膜透性进行研究。结果表明:河道公路两侧土壤重金属污染严重;污染区毛白杨SOD活性随着年龄增加而降低,POD活性和叶绿素含量随着年龄增加先增加后降低,CAT活性随着年龄的增加变化趋势不一致,而细胞膜透性随着年龄增加变化不明显;污染区不同年龄毛白杨SOD活性、POD活性、CAT活性、叶绿素含量以及细胞膜透性的化感指数变化趋势不一致;采用隶属函数值法对污染区毛白杨抗重金属特性分析得出,不同年龄毛白杨抗重金属能力表现为3年生>10年生>20年生>30年生,表明较大树龄的毛白杨抗重金属的能力有下降趋势。

Heavy metal content in the soil near roots of Populus tomentosa at different ages,and Superoxide dimutase （SOD）,Peroxidase（POD）,Catalase （CAT）,content of chlorophyll,permeability of cell membrane in the poplar various organs were studied. The trees located at sides of a road which was along a river,in Baoding,China. The results showed that the pollution of soil heavy was serious. SOD activity reduced with age of Populus tomentosa grown in the contaminative area. POD activity and content of chlorophyll increased at early stage and decreased later with age of Populus tomentosa, Variation of CAT activity had no relationship with the age of Populus tomentosa. Permeability of cell membrane was not difference over ages of Populus tomentosa. Variation pattern of allelopathic index of SOD,POD,CAT,Chlorophyll, permeability of cell membrane of different age Populus tomentosa in pollution area were inconsistent. Subordinate function value method （SFVM） was adopted in this paper to evaluate heavy resistance of Populus tomentosa in contaminative area comprehensively,the result indicated that the pollution capacity was 3 age 〉10 age〉 20 age 〉30 age,which suggested that resistance ability was reduced with age of Populus tomentos.