Application Research On The Aquatic Plants Improve The Self-purification Capacity For The Landscape Water

Aquatic plants as the urban landscape significant constituents, not only has the important landscape effect, but also the multiple ecological significance. If we didn't handle properly, it affected the ornamental value directly, and polluted circumjacent environment, also increased the environmental burden. We carried out the experiment for those characteristics that water surface was small, pollutant concentration was low, the plant configuration requested to created a good view of landscape, and then chose several normal aquatic plants which can show the good view of landscape like Pontederia cordata, Eleocharisdulcis, Iris pseudacorus, Spianthes aristotelia as the test plants. Through tested the several important indexes in different water, including chromaticity, oxygen levels, nitrogen and phosphorous, to see their changes of several important indexes. Analyzing the different effects of aquatic plants to the water quality, hope that provide for the future urban water plant landscape as the construction model. The main research contents below:(1)Through the related the concepts of urban water scenery and comb the research progress, determine the research methods and main contents.(2)in the meanwhile, we collected related survey data and analyzed, fully understood the present situation, the existing water city of aquatic plants configuration and the growth of comparison,in order to understood the cause of water quality, made the analysis of the water in four seasons and planed the experiment. For explore the water design with plants which suit for humanity environment and purifying water highly, we simulated the only factor aquatic plants which effected the water landscape, at the same time provided the basis data for the ecological function and landscape function of water in the urban landscape of economical management.(3)We choose Pontederia cordata, Eleocharisdulcis, Iris pseudacorus, Spianthes aristotelia to observing and testing for 50 days, the effects of four aquatic plants on chromaticity, oxygen levels, nitrogen and phosphorous of the tested water were analyzed. The results show that the DO contents order of four kinds of aquatic plants was E leocharisdulcis> Spianthes aristotelia> Iris pseudacorus> Pontederia cordata; the water turbidity order was Spianthes aristotelia> Eleocharisdulcis> Iris pseudacorus> Pontederia cordata; the TP content order was Spianthes aristotelia> Irisp seudacorus> Ponteder ia cordata> E leocharis dulcis; the TN content order was Spianthes aristotelia> E leocharisdulcis> Pontederia cordata> Iris pseudacorus. The PH values of the four water bodies were among 7.5 to 8.5. Iris pseudacorus and Pontederia cordata grew better than others. Pontederia cordata had the minimum water turbidity, so it had the most significant landscape effect.