One of the main issues with the East Route (ER) of the South-to-North Water Transfer Project (SNWTP) in China is water pollution. The Pingyin wetland, situated near the SNWTP, collects reclaimed water discharging from a sewage treatment plant. Selected aquatic plants were cultivated in the constructed wetland and their biomass, total nitrogen (TN) and total phosphorus (TP) contents and accumulation were studied to assess whether the selected plants were suitable for cultivation in the reclaimed water environment and to determine their nutrient removal rates. Most of the introduced species showed high vitality after 60 days growth, and plant biomass increased greatly from the early to the middle part of the growing season. The TN content for different plant species during the growing season varied from 30 -165 mg/g, while the TP contents varied from 5 -35 mg/g. The TN and TP contents of the introduced species were significantly higher than those of the local species. The main TN absorption organ was the plant leaves. The nutrient accumulation by the local species was significantly higher than that of the main introduced species since accumulation is determined mainly by the species biomass. The TN and TP removal of plants contributed 9.66% and 49%, respectively, to total nutrient removal in the constructed wetland.

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Water resources accounting aims to objectively evaluate the contribution of water to economic and social development and the negative effects of water utilization of economic social on water resources, through the establishment of the relationship between water and the economy. The computable general equilibrium (CGE) model contains water information is an ideal way to establish this relationship. Based on the comprehensive analysis of the CGE model in the field of water resources application methods, the paper proposes that water resources information can be built into the CGE model in the form of production factors and industry sectors, in order to truly establish the relationship between the water resources account and the national economic account. The CGE model for water resources accounting was built, on the data basis of the social accounting matrix (SAM) containing water resources accounts, by setting the economic subject, assuming the equilibrium relationship, and creating the computing functions. The study has realized the convergence of water resources and national economic accounting system, will enrich the research content of water resources accounting system, provide a reference for other resource special accounts and comprehensive environmental economic accounting, and some services for strict management and policy development of water resources. _________________________

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