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Root and Shoot Biomass Growth of Constructed Floating Wetlands Plants in Saline Environments

Author

Listed:
  • Oriana Sanicola

    (Stormwater Research Group, University of the Sunshine Coast, Sunshine Coast, QLD 4558, Australia)

  • Terry Lucke

    (Stormwater Research Group, University of the Sunshine Coast, Sunshine Coast, QLD 4558, Australia)

  • Michael Stewart

    (Stormwater Research Group, University of the Sunshine Coast, Sunshine Coast, QLD 4558, Australia)

  • Katharina Tondera

    (IMT Atlantique, Process Engineering for Environment and Food, Université Bretagne Loire, F-44307 Nantes, France)

  • Christopher Walker

    (Stormwater Research Group, University of the Sunshine Coast, Sunshine Coast, QLD 4558, Australia
    Covey Associates Pty Ltd., Maroochydore, QLD 4558, Australia)

Abstract

Constructed Floating Wetlands (CFWs) are increasingly being used globally in freshwater environments such as urban lakes and ponds to remove pollutants from urban stormwater runoff. However, to date there has been limited research into the use and performance of these systems in saline environments. This study compared the root and shoot biomass growth and nutrient uptake of five different plant species, Chrysopogon zizanioides , Baumea juncea , Isolepis nodosa , Phragmites australis and Sarcocornia quinqueflora , in three different saltwater treatments over a 12-week period. The aim of the study was to identify which of the plant species may be most suitable for use in CFWs in saline environments. Plant nutrient uptake testing revealed that Phragmites australis had the greatest percentage increase (1473–2477%) of Nitrogen mass in the shoots in all treatments. Sarcocornia quinqueflora also had impressive Nitrogen mass increase in saltwater showing an increase of 966% (0.208 ± 0.134 g). This suggests that the use of Phragmites australis and Sarcocornia quinqueflora plants in CFWs installed in saline water bodies, with regular harvesting of the shoot mass, may significantly reduce Nitrogen concentrations in the water. Isolepis nodosa had the greatest percentage increase (112% or 0.018 ± 0.020 g) of Phosphorous mass in the shoots in the saltwater treatment. Baumea juncea had the greatest percentage increase (315% or 0.026 ± 0.012 g) of Phosphorous mass in the roots in the saltwater treatment. This suggests that the use of Isolepis nodosa and Baumea juncea plants in CFWs installed in saline water bodies may significantly reduce Phosphorous concentrations in the water if there was a way to harvest both the shoots above and the roots below the CFWs. The study is continuing, and it is anticipated that more information will be available on CFW plants installed in saline environments in the near future.

Suggested Citation

  • Oriana Sanicola & Terry Lucke & Michael Stewart & Katharina Tondera & Christopher Walker, 2019. "Root and Shoot Biomass Growth of Constructed Floating Wetlands Plants in Saline Environments," IJERPH, MDPI, vol. 16(2), pages 1-11, January.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:2:p:275-:d:198976
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    References listed on IDEAS

    as
    1. Christopher Walker & Katharina Tondera & Terry Lucke, 2017. "Stormwater Treatment Evaluation of a Constructed Floating Wetland after Two Years Operation in an Urban Catchment," Sustainability, MDPI, vol. 9(10), pages 1-10, September.
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