关键词: 绿色屋顶, 水量水质, 城市区域, 降雨径流

Abstract: By imitating different concentration Cd^{2 +} polluted water environment, this paper dealt with the changes of some biochemical and physiological characters and the damage of ultrastructure in leaves of Altemanthera philoxe-roides. The result showed that SOD and POD activity first increased in the low concentration pollution and then decreased with the concentration of pollution raised. The content of chlorophyll, chlorophyll a/b value, CAT ac-tivity and the content of soluble protein all declined continually. With the concentration of pollution increased,the ultrastructure of cell nuclei, chloroplast and mitochondria became deformed, the permutation of structure in-side disordered, swelled, membrane disrupted and vesiculated. The changes of some biochemical and physiological characters accorded with the damage of cell ultrastrueture.

Key words: green roof, water quantity and quality, urban region, rainfall runoff.