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[1]WU Yuhan,YU Jun,WANG Ruihan.Effects of Sewage Purification by Different Plant Communities in the Constructed Wetland[J].Research of Soil and Water Conservation,2019,26(06):364-371.

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Effects of Sewage Purification by Different Plant Communities in the Constructed Wetland

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 06 Page number: 364-371 Column: Public date: 2019-10-17

Title:: Effects of Sewage Purification by Different Plant Communities in the Constructed Wetland

Author(s):: WU Yuhan¹, YU Jun¹, WANG Ruihan²; 1. Suzhou Polytechnic Institute of Agriculture, Suzhou, Jiangsu 215000, China;
2. College of Art and Design, Nanjing Forestry University, Nanjing 210037, China

Keywords:: constructed wetland; plant community; sewage; purification effects

CLC:: X524

DOI:: -

Abstract:: Hygrophyte is an important part of a constructed wetland system. Species composition of wetland plant communities are important in the water-cleaning functions of wetlands. Four common wetland plants (Zizania caduciflora, Iris tectorum, Acorus calamus and Potamogeton pectinatus) in natural wetlands were chosen. The effect of the different plant communities on the treatment of domestic sewage were compared. The results showed that the four different plant communities in constructed wetlands had different impact, and the concentrations of BOD₅, COD_Cr, TN, NH₄⁺-N, NO₃^--N, TP deceased with the time, decreased in the order:CK > Zizania caduciflora > Iris tectorum > Acorus calamus > Potamogeton pectinatus; the purification effects of BOD₅, COD_Cr, TN, NH₄⁺-N, NO₃^--N, TP increased with the time, decreased in the order:CK > Zizania caduciflora > Iris tectorum > Acorus calamus > Potamogeton pectinatus; the aboveground biomass ranged from 25.9~39.6 g/m², following the order:Zizania caduciflora > Iris tectorum > Acorus calamus > Potamogeton pectinatus, effects of Zizania caduciflora and Iris tectorum had no significant difference (p>0.05), effects of Acorus calamus and Potamogeton pectinatus had no significant difference (p>0.05); the belowground biomass ranged from 31.2~41.3 g/m², following the order:Zizania caduciflora > Iris tectorum > Acorus calamus > Potamogeton pectinatus, and presenting the significant difference (p<0.05); N and P accumulations in belowground were higher than aboveground, which decreased in the order:Zizania caduciflora > Iris tectorum > Acorus calamus > Potamogeton pectinatus, difference of P accumulation between the aboveground and belowground was not significant (p>0.05). The correlation analysis showed that there was the significant positive correlation between TP and P accumulations in water bamboo, irises, calamus and brassica. TN, NH₄⁺-N, NO₃^--N and N accumulations were significantly positively correlated. COD_Cr and BOD₅ were positively correlated with underground biomass, but not correlated with aboveground biomass and P accumulation. In total, the underground biomass plays an important role in the process of purifying water quality, and the plants with well developed root have the greater clean-up effect.

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