Page Banner

United States Department of Agriculture

Agricultural Research Service

Research Project: CONSERVATION EFFECTS ASSESSMENT FOR THE ST. JOSEPH RIVER WATERSHED

Location: National Soil Erosion Research Lab

Title: Seasonal Influence on Phosphorus (P) Sorption Capacities in Streams and Ditches in Eagle Creek Watershed

Authors
item Williams, C - PURDUE UNIVERSITY
item Joern, B - PURDUE UNIVERSITY
item Smith, Douglas
item Bowling, L - PURDUE UNIVERSITY
item Lembi, C - PURDUE UNIVERSITY

Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: September 4, 2007
Publication Date: November 5, 2007
Citation: Williams, C., Joern, B., Smith, D.R., Bowling, L., Lembi, C. 2007. Seasonal Influence on Phosphorus (P) Sorption Capacities in Streams and Ditches in Eagle Creek Watershed. American Society of Agronomy Annual Meeting Abstracts. November 4-8, 2007, New Orleans, LA. 2007 CDROM.

Technical Abstract: Internal P loading from sediments to waterbodies may be a significant source of P and may prevent the attainment of surface water nutrient criteria developed by the USEPA. Our objectives were to 1) relate surface water P concentrations to sediment P, 2) determine if differences in land use were related to ditch and stream water P concentrations and sediment P status and 3) determine if seasonal differences were associated with water and sediment P concentrations in the ditches and streams that contribute to a major drinking water reservoir for the city of Indianapolis, IN. Findings showed that there was often a relationship between sorption capacity of the sediment and water column P, but the relationship was not consistent. The potential mass of P that could be sorbed by the sediment before soluble P exceeded the proposed EPA nutrient criteria limit (0.076 mg P/L) was greatest for August samples. Extractable P (20 mM CaCl2) in sediment was consistently below the proposed EPA nutrient criteria for all samples and sampling months. This information is beneficial in quantifying P dynamics in different land use types.

Last Modified: 9/2/2014
Footer Content Back to Top of Page