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Nitrogen Distribution in Soils of Constructed Wetlands Treating Lagoon Wastewater

^a USDA-ARS, Coastal Plains Soil, Water and Plant Research Center, 2611 W. Lucas Street, Florence, SC 29501
^b College of Agriculture and Life Sciences, Animal Waste Management Programs, Box 7927, North Carolina State Univ., Raleigh, NC 27695

View larger version (27K): [in a new window]   Fig. 1. Schematic of constructed wetlands.

View larger version (63K): [in a new window]   Fig. 2. Mean annual soil N concentrations by depth in Cells 1 and 2 of Wetland System 1 (WS1, Schoenoplectus/Scirpus/Juncus) and in Cells 3 and 4 of Wetland System 2 (WS2, Typha/Sparganium). Means for each soil depth followed by the same letter are not significantly different (P < 0.10) within the same year.

View larger version (26K): [in a new window]   Fig. 3. Surface water and soil pore water profiles of ammonium-N concentration with depth (1-cm interval) in Wetland System 1 (WS1, Cells 1 and 2, Schoenoplectus/Scirpus/Juncus) and Wetland System 2 (WS2, Cells 2 and 3, Typha/Sparganium). Solid horizontal lines at depth = 0 indicate the soil–water interface boundary. Each data point is the mean of duplicate samples.

View larger version (26K): [in a new window]   Fig. 4. Relationship of mean NH+4–N inflow concentration vs. mean NH+4–N pore water concentration (pooled by depth) of each wetland cell for Wetland System 1 (WS1, Schoenoplectus/Scirpus/Juncus) and Wetland System 2 (WS2, Typha/Sparganium).