Study on the Ecological Process in an Urban Wetland Creation
城市地区重建湿地的生态过程研究

The dynamics of physical,chemical and biological processes was researched in an urban created wetland in Tianjin.The result showed that all introduced macrophytes survived and the aboveground biomass increased 13 fold for Phragmites australis,1.5 fold for Acorus calamus and 1.4 fold for Typha orientalis,respectively.And 11 other macrophytes were occurred in the basin.For the nutriments in the sediment,the organic matter decreased,total Kjeldahl nitrogen significantly decreased from(1?500)(mg/kg) to 720(mg/kg)(p<0.01),and total phosphorus slightly increased in created wetland.12 parameters of the water quality were determined.The water quality was improved in summer season,since dissolved oxygen increased,and other parameters,such as total nitrogen,chlorophyll a,and the number of algae decreased from inflow to outflow.The study indicated that the biodiversity naturally increated in created wetland.The created wetland played a role for the stand and improvement of water quality.