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- Title
Hydrologic and Phosphorus Export Behavior of Small Streams in Commercial Poultry-Pasture Watersheds.
- Authors
Romeis, J. Joshua; Jackson, C. Rhett; Risse, L. Mark; Sharpley, Andrew N.; Radcliffe, David E.
- Abstract
Romeis, J. Joshua, C. Rhett Jackson, L. Mark Risse, Andrew N. Sharpley, and David E. Radcliffe, 2011. Hydrologic and Phosphorus Export Behavior of Small Streams in Commercial Poultry-Pasture Watersheds. Journal of the American Water Resources Association (JAWRA) 1-19. DOI: 10.1111/j.1752-1688.2011.00521.x Few watershed-scale studies have evaluated phosphorus export in streamflow from commercial poultry-pasture operations. Continuous streamflow and mixed-frequency water quality datasets were collected from nine commercial poultry-pasture (AG) and three forested (FORS) headwater streams (2.4-44 ha) in the upper Etowah River basin of Georgia to estimate total P (TP) loads and examine variability of hydrologic response and water quality of storm and nonstorm-flow regimes. Data collection duration ranged from 18 to 22 months, and approximately 1,600 water quality samples were collected. Significant ( p < 0.1) inverse relationships were detected between peak flow response variables and both drainage area and fraction of forest cover. Order-of-magnitude differences in TP and dissolved reactive P (DRP) concentration were observed between AG and FORS sites and among AG sites. TP yields of FORS sites ranged from 0.01 to 0.1 kg P/ha. Yields of AG sites ranged from 0.031 to 3.17 kg P/ha (median = 0.354 kg P/ha). With 95% confidence intervals, AG yields ranged from 0.025 to 13.1 kg P/ha. These small-watershed-scale yields were similar to field-scale yields measured in other studies in other regions. TP yields were significantly related to area-weighted Mehlich-1 soil test P concentrations ( p = 0.0073) and base-flow water sample P concentrations ( p ≤ 0.0005). Water quality sampling during base-flow conditions may be a useful screening tool for P risk-based management programs.
- Subjects
NONPOINT source pollution research; BEST management practices (Pollution prevention); WATERSHEDS; HYDROLOGICAL research; TOXICOLOGY of phosphorus; STREAMFLOW
- Publication
Journal of the American Water Resources Association, 2011, Vol 47, Issue 2, p367
- ISSN
1093-474X
- Publication type
Article
- DOI
10.1111/j.1752-1688.2010.00521.x