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Plant dry matter measurements (Table 3) showed that C content was slightly higher in the cattails from the wetland outlet than the inlet area. The wetlands are facilitated with gravity flow and the differences may be due to the bottom slope that could have caused a greater accumulation of water and nutrients in the outlet, resulting in a higher total nutrient accumulation in the harvested biomass. Maucieri et al. (2014) have also reported similar observations. Further, high levels of nutrients entering the wetland system denote higher plant biomass resulting in higher nutrient accumulations in the vegetation (Lee et al. 2014). Averaging the data from inlet and outlet, cattails were observed to accumulate 6.1 Mg of TN and 0.25 Mg of TC ha−1 yr−1 (Table 3). Maucieri et al. (2014) reported a dry matter organic carbon content of 3.9 Mg ha−1 in the aerial parts of common reed (Phragmites australis (Cav.)).

Table 3

TC and TN accumulation in cattail plants collected in 2013 in swine wastewater inlet and outlet locations of a constructed wetland cell

 Mg ha−1 yr−1
LocationTotal NTotal C
Inlet 5.1 (0.2) 0.2 (0.1) 
Outlet 7.1 (1.5) 0.3 (0.1) 
Averaged across depth 6.1 (0.85) 0.25 (0.1) 
 Mg ha−1 yr−1
LocationTotal NTotal C
Inlet 5.1 (0.2) 0.2 (0.1) 
Outlet 7.1 (1.5) 0.3 (0.1) 
Averaged across depth 6.1 (0.85) 0.25 (0.1) 

*Numbers in parentheses are standard errors.

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