Relationship between the physiological characters and purification ability of different plants in waters with two trophic levels Absorbability of wetland plants on N and P from eutrophic water Nutrient removal role of plants in constructed wetland on sightseeing water Effects of Eutrophic Water Irrigation on Physio-ecological Characteristics of Festuca arundinacea L. STUDY ON AQUATICD OFF FLAVORS IN EUTROPHIC DONGHU LAKE