Soil P Storage Capacity in Agricultural Treatment Wetlands: Can a System Designed for N Reduction Also Retain P?
| Autor: | A. Maria Lemke, Jacob F. Berkowitz, Christine M. VanZomeren, Krista G. Kirkham |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
geography
geography.geographical_feature_category Ecology Floodplain Water flow Phosphorus chemistry.chemical_element Wetland 04 agricultural and veterinary sciences 010501 environmental sciences 01 natural sciences Soil conditioner Nutrient Agronomy chemistry Tile drainage Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental Chemistry Environmental science 0105 earth and related environmental sciences General Environmental Science |
| Zdroj: | Wetlands. 40:503-514 |
| ISSN: | 1943-6246 0277-5212 |
| Popis: | Increasing interest focuses on utilizing wetlands to reduce nutrient loading to surface waters. The current study examines soil P storage capacity in three treatment wetlands designed to decrease N loading from an agricultural tile drainage system in Illinois. Adjacent farm field and restored floodplain wetland soils were also evaluated. Results demonstrate that wetland soils sequestered P; however, the magnitude of P retention varied significantly across treatment systems and floodplain wetlands related to differences in soil properties. Soil P storage capacity increased in the direction of water flow, but varied across treatment wetlands; soils ranged from P sinks (5.8 ± 1.5 mg P kg−1) to potential P sources (−17.2 ± 2.0 mg P kg−1). Farm fields displayed the highest water soluble P levels (11.3 ± 1.5 mg P kg−1) and represented the largest potential source of P with a mean storage capacity of −48.6 ± 6.8 mg P kg−1. A phosphorus saturation ratio threshold value of 0.10 differentiated between potential P sources and sinks. Findings suggest wetlands receiving P loadings from tile drainage accumulate soil P over time, but maintaining P removal efficiency in treatment wetlands may require periodic management to decrease soil P concentrations via nutrient removal and/or soil amendments. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink