Response of the morphological and physiological characteristics of aquatic plants to long-term soaking in the process of constructed wetland wastewater treatment
人工湿地处理污水时水生植物形态和生理特性对污水长期浸泡的响应

Aquatic plants (phramites comunis, typha latifola) were soaked in wastewater and clean water to investigate their morphological and physiological characteristics changes in constructed wetland wastewater treatment.The peroxidase(POD) and catalase(CAT) activities of aquatic plants in wastewater and clean water were measured, and the response way of the aquatic plants to long-term soaking in wastewater was studied. The results show that the aquatic plants change their morphological and physiological characteristics dramatically with the variation of soaking time. The phramites comunis in wastewater had low-height, small-leaves and high-density compared with that in clean water: the plant height lowered obviously, with the average variation value of 71.1 cm; the leaf length and the maximum leaf width decreased, and the average variation values were of 11.3 cm and 0.62 cm, respectively; while the density of planting and planting root increased by 300%.The activities of POD and CAT in aquatic plants were also changed: the POD activities of typha latifola in wastewater increased obviously and was 73.51U·g-1·min-1 higher than that in clean water, while the CAT activities of phramites comunis and typha latifola decreased obviously, lower than that in clean water by 0.068mg·g-1·min-1 and 0.1071 mg·g-1·min-1, respectively.