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ARS Home » Midwest Area » Ames, Iowa » National Laboratory for Agriculture and The Environment » Agroecosystems Management Research » Research » Research Project #432279

Research Project: Phosphorus Contributions from Eroding Iowa Stream Banks

Location: Agroecosystems Management Research

Project Number: 5030-12210-003-66-N
Project Type: Non-Funded Cooperative Agreement

Start Date: Oct 1, 2016
End Date: Aug 31, 2019

Objective:
1) Quantify stream bed and bank erosion and resulting sediment and P flux from first-order, warm-water streams in Iowa; 2) Provide data to establish process-based relationships between stream bed and bank erosion and land management along pasture and cropland streams; and 3) Determine the relationship of P adsorption/desorption processes of soils and sediments within these watersheds, and use this information to evaluate the risk of P losses within these and similar Iowa streams.

Approach:
The research will include field measurements of bank erosion, sediment sampling, laboratory processing, and analysis of geospatial data. Onion Creek work will be extended using the new water-quality monitoring station near the mouth of the creek, installed in fall 2015 as part of previously-funded work. Measurements will also take place in the Nishnabotna River watershed in southwest Iowa. Soil samples will be taken from each major unit represented in eroding stream banks, and will be analyzed for P concentration and bulk density. Erosion rates will be estimated from aerial-photo analysis and converted to P source estimates using LiDAR-derived channel geometry and laboratory measurements of sediment P concentrations.