Ecological Benefits
- By employing the Fuzzy Comprehensive Evaluation method and the Comprehensive Index Evaluation method, a comparative analysis of the water quality of the Hou Tan Ecological Water System at the 2010 Shanghai World Expo throughout the year was conducted. Both evaluation results indicated that the water quality was purified from Class V of the Huangpu River to Class I–II at the outlet of the Hou Tan Ecological Water System, objectively reflecting the overall trend of water quality changes.
Data Source:
Dong Y Zhang Y, Wang C et al. Evaluation of Water Quality in the Hou Tan Ecological Water System of the Shanghai World Expo Using Two Methods [J]. Jiangsu Agricultural Sciences, 2013, 41(1): 348-351.
- Through the ecological purification effect of the Hou Tan wetland, the water quality was improved from Classes V–IV to III–II; the main pollution indicator of the Hou Tan wetland is Total Nitrogen (TN), which varies with the concentration of Nitrate-Nitrogen (NO3-N); the differences in Iwq between the two stages are significant (p<0.05), and the proportion of target water quality increases over time, indicating a transition of the wetland ecosystem from adaptability to stability.
- The construction method of this wetland ecosystem and the water quality regulation process have a significant effect on water purification and have a promising application prospect.
Data Source:
Dong Y, Zhang Y, Liu X, et al. Study on the Construction of Wetland Ecosystem and Water Quality Regulation Effects in the Hou Tan Wetland of the Shanghai World Expo Park [J]. Wetland Science, 2013, 11(2):8.
- After the completion of the Hou Tan Wetland Park in 2007, a total of 138 plant species belonging to 51 families and 108 genera were recorded. The vegetation is composed of dominant groups such as Poaceae, Asteraceae, Polygonaceae, and Brassicaceae, reflecting the basic floristic characteristics of the early stage of biological community succession in the Shanghai region.
Data Source:
Zhang Y, Luo K, Zuo B, et al. Preliminary Analysis of Vegetation Characteristics in the Hou Tan Wetland of the Shanghai World Expo Park [J]. Shanghai Journal of Agriculture, 2007, 23(3):8.
- The submerged plant community system in the Hou Tan wetland has a significant effect on the restoration of nutrients in the sediment. The coverage and biomass of the submerged plant community show obvious seasonal changes, generally increasing, and are positively correlated with the organic matter (OM), Total Nitrogen (TN), and Total Phosphorus (TP) in the sediment; after the sediment is restored, the quality fractions of OM, TN, and TP are reduced by 61.9%–79.7%, 78.7%–83.9%, and 32.3%–42.7% respectively compared to the background values; the organic index of the sediment is reduced from Grade IV (organic pollution) to Grade II (cleaner), reducing the risk of eutrophication in the water body.
Data Source:
Dong Y, Huo H, Xie W, et al. Ecological Restoration Effect of Submerged Plant Community System on Sediment in Hou Tan Wetland, Shanghai [J]. Journal of Safety and Environment, 2013, 13(2): 147-153.
- A total of 18 species of intertidal benthic animals were identified in the Hou Tan Park wetland in 2006 and 2007, with the richest species number in the summer. The benthic bio-index can be used to evaluate the wetland water environment in different seasons, but the evaluation results are affected by the pollution status of the water source.
Data Source:
Zhang Y, Huang W, Luo K. Community Characteristics and Environmental Analysis of Macrobenthos in Hou Tan Wetland of the Shanghai World Expo Park [J]. Wetland Science, 2007, 5(4):326-333.
- A total of 53 species of benthic animals were identified in the Hou Tan Wetland Park from 2009 to 2011, and five biological indices all increased to varying degrees compared to the earlier period, reflecting an improvement in the wetland water quality, which has significantly improved compared to before its construction.
Data Source:
Hu Z, Wang S, Zhang Y, et al. Community Characteristics of Benthic Animals and Water Quality Evaluation in Hou Tan Wetland of the Shanghai World Expo Park [J]. Acta Scientiae Circumstantiae, 2013, 33(4): 1080-1088.
- A total of 23 species of copepods were identified in the Hou Tan wetland from 2009 to 2010, belonging to 6 families and 11 genera, which is richer than in nearby waters, with the highest number in summer and the lowest in winter, showing a clear monthly replacement, indicating that the wetland environment is favorable for the survival of copepod communities.
Data Source:
Chen L Wu Y, Jing Y, et al. Community Characteristics of Copepods and Their Response to Environmental Factors in Hou Tan Wetland of the Shanghai World Expo Park [J]. Environmental Science, 2012, 33(11):8.
- The analysis of physicochemical indicators such as nitrogen and phosphorus nutrients, organic matter content, pH value, and moisture content in the sediment of the water body in Hou Tan Wetland Park of the Shanghai World Expo Park showed that the organic matter was 32.1–47.6 g/kg, total nitrogen was 648–916 mg/kg, and total phosphorus was 545–720 mg/kg. The average organic pollution index of the sediment was 0.245, more than 5 times the evaluation standard, indicating Grade III fertility pollution, which is more serious. The reason is that tributaries such as Bailianjing, which bring water into the park, are seriously affected by upstream industrial pollution, affecting the water body of the park itself.
Data Source:
Tang S, Gong L, Wang J, et al. Analysis of Sediment Characteristics and Pollution Indexes in Hou Tan Wetland Park of the Shanghai World Expo Park [J]. Water Science and Technology and Economy, 2022, 28(01):24-27.