Journal article
Contribution of streambanks to phosphorus export from Iowa
Journal of soil and water conservation, Vol.77(2), pp.103-112
03/01/2022
DOI: 10.2489/jSWC.2022.00036
Abstract
Phosphorus (P) from nonpoint upland and channel sources contributes to development of hypoxic conditions in receiving waters around the world. Streambanks are thought to be a potentially large contributor to sediment P loads in agricultural watersheds, but are often unaccounted for in P loss reduction strategies. In this analysis, we estimate the contribution of streambank sources to total P (TP) export from the state of Iowa using a multistep process and relate this to overall statewide P export. Using GIS mapping and field monitoring, we estimate that 35,200 m of 3.2 m high streambanks are actively eroding in Iowa rivers at a rate of 12.4 cm y(-1). With an average streambank soil TP concentration of 470 mg kg(-1) and bulk density of 1.17 g cm-3, approximately 7,681 Mg of TP is annually eroded from streambanks and delivered to Iowa rivers. Over an 18-year period, we estimate that streambanks contributed approximately 31% of the riverine TP export from Iowa. Despite limitations in our analysis, an improved understanding of streambank P contributions will help natural resource managers make appropriate recommendations for effective soil and water conservation practices that best reduce P loading to rivers. Our study is believed to be among the first to address the issue of streambank P at a scale that has confounded many state and regional nutrient assessments.
Details
- Title: Subtitle
- Contribution of streambanks to phosphorus export from Iowa
- Creators
- K. E. Schilling - University of IowaT. M. Isenhart - Iowa State UniversityC. F. Wolter - Iowa Dept Nat Resources, Des Moines, IA USAM. T. Streeter - Univ Iowa, Iowa Geol Survey, Iowa City, IA 52240 USAJ. L. Kovar - National Laboratory for Agriculture and the Environment
- Resource Type
- Journal article
- Publication Details
- Journal of soil and water conservation, Vol.77(2), pp.103-112
- Publisher
- Soil Water Conservation Soc
- DOI
- 10.2489/jSWC.2022.00036
- ISSN
- 0022-4561
- eISSN
- 1941-3300
- Number of pages
- 10
- Grant note
- INRC 2017-01; RB10-014 / Iowa Nutrient Research Center
- Language
- English
- Date published
- 03/01/2022
- Academic Unit
- Earth and Environmental Sciences; IIHR--Hydroscience and Engineering
- Record Identifier
- 9984383924602771
Metrics
29 Record Views