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Research ArticleResearch Section

Environmental effects of agricultural conservation: A framework for research in two watersheds in Oklahoma's Upper Washita River Basin

J.L. Steiner, P.J. Starks, J.A. Daniel, J.D. Garbrecht, D. Moriasi, S. McIntyre and J.-S. Chen
Journal of Soil and Water Conservation November 2008, 63 (6) 443-452; DOI: https://doi.org/10.2489/jswc.63.6.443
J.L. Steiner
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P.J. Starks
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J.A. Daniel
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J.D. Garbrecht
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D. Moriasi
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S. McIntyre
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J.-S. Chen
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Abstract

Agriculture in the Upper Washita River Basin represents mixed crop-livestock systems of the Southern Plains. Research in the Little Washita River Experimental Watershed and the Fort Cobb Reservoir Experimental Watershed addresses interactive effects of variable climate, land use, and management on environmental quality. The Little Washita River watershed provides opportunities to explore impacts of flood retarding impoundments within a watershed. The Fort Cobb Reservoir watershed provides opportunities to study effects of agricultural conservation on a large eutrophic reservoir. Analysis of 1940 to 2005 data from the Fort Cobb Reservoir watershed showed that precipitation increased 33%, corresponding runoff increased 101%, and sediment yield increased 183% when comparing multi-year wet periods to multi-year dry periods. Depth to groundwater exhibited seasonal and interannual variation. A rapid geomorphic assessment indicated that unstable stream channels dominate the stream networks. Phosphorus concentration in streams was correlated to multiple attributes of the contributing areas, including contributing area, slope, stream density, and channel stability. Anticipated outcomes are improved understanding of environmental effects of conservation, new approaches to mitigation of water quality problems, and tools to support strategic placement of conservation practices on the landscape to achieve environmental goals.

Footnotes

  • Jean L. Steiner is a supervisory soil scientist, Patrick J. Starks is a soil scientist, John A. Daniel is a geologist, Jurgen D. Garbrecht is a hydraulic engineer, Daniel Moriasi is a hydrologist, and Sherwood McIntyre is an ecologist for the Grazinglands Research Laboratory, USDA Agricultural Research Service, El Reno, Oklahoma. Jin-Song Chen is a former research associate with the team.

  • © 2008 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 63 (6)
Journal of Soil and Water Conservation
Vol. 63, Issue 6
November/December 2008
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Environmental effects of agricultural conservation: A framework for research in two watersheds in Oklahoma's Upper Washita River Basin
J.L. Steiner, P.J. Starks, J.A. Daniel, J.D. Garbrecht, D. Moriasi, S. McIntyre, J.-S. Chen
Journal of Soil and Water Conservation Nov 2008, 63 (6) 443-452; DOI: 10.2489/jswc.63.6.443

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Environmental effects of agricultural conservation: A framework for research in two watersheds in Oklahoma's Upper Washita River Basin
J.L. Steiner, P.J. Starks, J.A. Daniel, J.D. Garbrecht, D. Moriasi, S. McIntyre, J.-S. Chen
Journal of Soil and Water Conservation Nov 2008, 63 (6) 443-452; DOI: 10.2489/jswc.63.6.443
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