| Autor: |
Garcia Chance LM; Water Treatment Technology Laboratory, South Carolina Water Resources Center, Clemson University, 509 Westinghouse Rd., Pendleton, South Carolina 29670, United States.; Department of Plant and Environmental Sciences, E-143 Poole Agricultural Center, Clemson University, Clemson, South Carolina 29634, United States., Majsztrik JC; Water Treatment Technology Laboratory, South Carolina Water Resources Center, Clemson University, 509 Westinghouse Rd., Pendleton, South Carolina 29670, United States., Bridges WC; School of Mathematical and Statistical Sciences, Clemson University, O-110 Martin Hall, Box 340975, Clemson, South Carolina 29634, United States., Willis SA; Water Treatment Technology Laboratory, South Carolina Water Resources Center, Clemson University, 509 Westinghouse Rd., Pendleton, South Carolina 29670, United States., Albano JP; USDA-ARS Horticultural Research Laboratory, 2001 South Rock Rd., Fort Pierce, Florida 34945, United States., White SA; Water Treatment Technology Laboratory, South Carolina Water Resources Center, Clemson University, 509 Westinghouse Rd., Pendleton, South Carolina 29670, United States.; Department of Plant and Environmental Sciences, E-143 Poole Agricultural Center, Clemson University, Clemson, South Carolina 29634, United States. |
| Abstrakt: |
Irrigation return water from container plant nurseries often contains elevated levels of nitrogen (N) and phosphorus (P). Floating treatment wetlands (FTWs) are one solution for removing nutrients from irrigation return flow. This study assessed how FTW planting strategy (monoculture vs mixed planting) influenced removal of N and P. Tanks containing FTWs received water with ∼22.3 N and 3.12 mg·L -1 P water-soluble fertilizer every 7 days for two, 8-week experiments. Experimental treatments were a control (open water); monoculture plantings ( Iris ensata 'Rising Sun', Canna ×generalis 'Firebird', Agrostis alba , Carex stricta , or Panicum virgatum ); or mixed plantings [2 mixtures: partial (monocots only) or a complete mixture of all plants]. For FTWs established in all treatments (except control), N and P removal from solution was additive, with a similar mass of N and P removed. However, when assessing nutrient uptake within plant tissues in FTWs, Panicum virgatum performed better (absorbed more N) within mixtures, a possible synergistic effect, while Iris ensata 'Rising Sun' performed poorly (fixed less N) within the complete mixture, a possible antagonist effect. Nutrient assimilation within plant tissues did not correlate with overall remediation performance for monocultures or mixtures, as tissue accumulation varied by nutrient and mixture. |
