2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 10:15 AM - 10:30 AM | SURFACE WATER AVAILABILITY CAN REGULATE WATER QUALITY AND NUTRIENT RETENTION IN AQUATIC AGROECOSYSTEMS | 410 B
SURFACE WATER AVAILABILITY CAN REGULATE WATER QUALITY AND NUTRIENT RETENTION IN AQUATIC AGROECOSYSTEMS
Surface water quantity in agricultural landscapes is changing due to increased irrigation demands, changing precipitation patterns, and advancing water use strategies. Understanding the implications of surface water depth on aquatic ecosystem structure and function is key to maintaining biodiversity and water quality, and potentially optimizing services such as nutrient retention. Continuous water quality and hydrologic monitoring, and a series of discrete experiments occurred in three shallow lake/stream systems in heavily agricultural northwest Mississippi from 2011 to 2017. Lake and stream water depth and runoff patterns were important drivers of dissolved oxygen and nutrient dynamics in these hypereutrophic, highly turbid systems. Generally, lower water levels led to overall greater benthic primary production and lower water column nutrients, but also produced overall lower and more variable dissolved oxygen concentrations. Runoff pollutants, particularly sediment, carbon, and nitrogen, were important triggers of state changes in primary producer distribution and abundance, hypoxia, and denitrification potential within lakes. As water management strategies increasingly manipulate surface water storage and move water across watersheds, there is potential to manage surface water quantity to maximize aquatic ecosystem services, while maintaining multi-use goals in agricultural landscapes.
- Landuse
- Multi-stressors
- Primary Production
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Presenters/Authors
Justin Murdock
(), Tennessee Tech University, jnmurdock@tntech.edu;
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Martin Locke
(), USDA-ARS, martin.locke@ars.usda.gov ;
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Richard Lizotte
(), USDA, Agricultural Research Service, National Sedimentation Lab , richard.lizotte@ars.usda.gov;
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Jason M. Taylor
(), USDA, Agricultural Research Service, National Sedimentation Lab, jason.taylor@ars.usda.gov;
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