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Article

Long-Term Oxbow Lake Trophic State under Agricultural Best Management Practices

1
USDA-ARS National Sedimentation Laboratory, Oxford, MS 38655, USA
2
University of Mississippi Field Station, The University of Mississippi, Abbeville, MS 38601, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Per-Erik Mellander
Water 2021, 13(8), 1123; https://doi.org/10.3390/w13081123
Received: 20 March 2021 / Revised: 13 April 2021 / Accepted: 17 April 2021 / Published: 20 April 2021
A key principle of agricultural best management practices (BMPs) is to improve water quality by reducing agricultural-sourced nutrients and associated eutrophication. Long-term (1998–2016) lake summer trophic state index (TSI) trends of an agricultural watershed with agricultural best management practices (BMPs) were assessed. Structural BMPs included vegetative buffers, conservation tillage, conservation reserve, a constructed wetland, and a sediment retention pond. TSI included Secchi visibility (SD), chlorophyll a (Chl), total phosphorus (TP), and total nitrogen (TN). Summer TSI 1977 was >80 in 1998–1999 (hypertrophic) and decreased over the first 10 years to TSI 1977 ≈ 75 (eutrophic). TSI 1977 decrease and changing TSI deviations coincided with vegetative buffers, conservation tillage, and conservation reserve. The TSI(SD) decrease (>90 to <70) coincided with vegetative buffers and TSI(TP) decrease (>90 to <75) coincided primarily with conservation tillage and the sediment retention pond. TSI(Chl) increase (<60 to >70) coincided with conservation tillage and vegetative buffer. Results indicate watershed-wide BMPs can modestly decrease summer trophic state through increased water transparency and decreased TP, but these changes are off-set by increases in chlorophyll a to reach a new stable state within a decade. Future research should assess algal nutrient thresholds, internal nutrient loading, and climate change effects. View Full-Text
Keywords: eutrophication; vegetated buffers; wetlands; conservation tillage; row-crop agriculture eutrophication; vegetated buffers; wetlands; conservation tillage; row-crop agriculture
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MDPI and ACS Style

Lizotte, R.E., Jr.; Yasarer, L.M.W.; Bingner, R.L.; Locke, M.A.; Knight, S.S. Long-Term Oxbow Lake Trophic State under Agricultural Best Management Practices. Water 2021, 13, 1123. https://doi.org/10.3390/w13081123

AMA Style

Lizotte RE Jr., Yasarer LMW, Bingner RL, Locke MA, Knight SS. Long-Term Oxbow Lake Trophic State under Agricultural Best Management Practices. Water. 2021; 13(8):1123. https://doi.org/10.3390/w13081123

Chicago/Turabian Style

Lizotte, Richard E., Jr.; Yasarer, Lindsey M.W.; Bingner, Ronald L.; Locke, Martin A.; Knight, Scott S. 2021. "Long-Term Oxbow Lake Trophic State under Agricultural Best Management Practices" Water 13, no. 8: 1123. https://doi.org/10.3390/w13081123

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