Ecological Habits And Landscpe Design Of Wetland Plants In Hangzhou City

As the cradle of civilization, wetlands are an ecosystem with special hydrological characteristics and city wetlands, called"kidney of the city", are the important ecological infrastructure in a city. With the increase of population and the speedup of urbanization, urban wetlands and biological diversity are decreasing and the ecological environment is being damaged. Thus, it is urgent and vital to protect urban wetlands.Through wetland plants, we can effectively protect and restore urban wetland ecosystem so as to realize the multifunction of city wetlands.Based on the investigation and analysis of the main urban wetlands and wetland plants in Zhejiang, especially in the city of Hangzhou. A quantificational study on the menace reaction of wetland plants to the environment is the base and precondition for building wetland plantscape and of vital significance to the protection and restoration of urban wetlands.The results of the study are as follows:1. A study on adversity physiology against pollution menace. Through the study on pollution menace to 24 kinds of wetland plants such as Arundo donax var.versicolor,Cyperus alternifolius,Alisma orientale,Typha angustifolia,Lythrum salicaria,Thalia dealbata,Sagittaria sagittifolia,Nymphaea tetragona,Canna generalis,Zizania latifolia,Typha latifolia,Pontederia cordata,Iris pseudacorus,Vallisneria natans and Ceratophyllum demersum, etc, the result shows that all wetland plants grow quite well in polluted water, content of nutrients in plants vary a lot and content of nutrients in plants increases largely after the plants grow in polluted water. Cyperus alternifolius and Hedychium coronarium have the strongest ability to absorb N while Typha latifolia and Iris ensata var. hortensis to absorb P. Typha angustifolia,Hydrocotyle vulgaris,Canna generalis are good at absorbing K while Zizania latifolia,Arundo donax var.versicolor,Cyperus alternifolius,Alisma orientale at absorbing Ka. Arundo donax var.versicolor,Thalia dealbata and Hygroryza aristata are good at absorbing Mg and the roots of Typha latifolia and Sagittaria sagittifolia are good at absorbing F. Content of Fe in laminae of Lythrum salicaria increases about 8 times...