[1]YANG Bo.Long-Term Purification Effect of Surface Flow Constructed Wetland on Water Quality of Liaohe River[J].Research of Soil and Water Conservation,2021,28(01):373-379.
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Long-Term Purification Effect of Surface Flow Constructed Wetland on Water Quality of Liaohe River
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 01
Page number:
373-379
Column:
Public date:
2021-01-10
- Title:
- Long-Term Purification Effect of Surface Flow Constructed Wetland on Water Quality of Liaohe River
- Keywords:
- constructed wetlands; Liaohe; purifying water quality
- CLC:
- X524
- DOI:
- -
- Abstract:
- Plants are important components of constructed wetland ecosystem. Zizania caduciflora, Iris tectorum, Canna indica and Phragmites australis were selected to study the purification effect of constructed wetlands on water quality of Liaohe River under different plant configurations for four consecutive years(2015—2018). The removal rates of BOD5, CODCr, TN and TP by different types of vegetation in constructed wetlands from 2015 to 2018 had increased over the years. The removal rates of BOD5, CODCr, TN and TP were significantly higher than those of Canna indica and Iris tectorum(p<0.05)in different years, but there was no significant difference between the removal rates of Phragmites australis and Zizania aquatica(p>0.05), while there was no significant difference between removal rates of Canna indica and Iris tectorum(p>0.05). The aboveground biomass, underground biomass, N accumulation and P accumulation of constructed wetland had increased over the years. The aboveground biomass of Phragmites australis was significantly higher than that of Canna indica and Iris tectorum(p<0.05)in different years, and there was no significant difference between the biomass of Phragmites australis and Zizania aquatica(p>0.05), while there was no significant difference between the biomass of Canna indica and Iris tectorum(p>0.05). The contents of soil organic carbon, total nitrogen, total potassium, available phosphorus, alkali-hydrolyzed nitrogen of constructed wetland showed consistent change patterns, and had increased over the years. The contents of organic carbon, total nitrogen, total phosphorus, total potassium, available phosphorus and alkaloid nitrogen were significantly higher than those in Canna indica and Iris tectorum(p<0.05)in different years, but there was no significant difference between Phragmites australis and Zizania aquatica(p>0.05), and no significant difference between the contents of Canna indica and Iris tectorum(p>0.05). There was no significant difference in soil total phosphorus contents in different years(p>0.05). The soil microbial biomass carbon, nitrogen and phosphorus of the constructed wetlands changed in a consistent manner and had increased over the years. Soil microbial biomass of carbon, nitrogen and phosphorus of constructed wetlands Phragmites australis and Zizania aquatica were significantly higher than those of the constructed wetlands with Canna indica and Iris tectorum(p<0.05), and there was no significant difference between soil microbial biomass under the constructed wetland with Phragmites australis and Zizania aquatica(p>0.05), while there was no significant difference between Canna indica and Iris tectorum(p>0.05). There was no significant difference in soil microbial biomass phosphorus content in different years(p>0.05). Underground biomass, N accumulation, P accumulation, soil total nitrogen, total phosphorus were significantly positively correlated with TN and TP removal rates(p<0.05). Soil available phosphorus, alkali-hydrolyzed nitrogen, microbial biomass carbon and microbial biomass nitrogen were significantly positively correlated with BOD5 and CODCr removal rates(p<0.05).
- References:
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Last Update:
2021-01-15