July 30-1030-Richard Lizotte
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This document summarizes the effects of conservation practices on eutrophication in Beasley Lake. Integrated best management practices including reduced tillage, vegetated buffers, and sediment ponds reduced nutrient runoff into the lake from surrounding crop fields. This led to reductions in lake nutrient concentrations, algal blooms, and instances of low dissolved oxygen over time. However, internal nutrient loading from lake sediments may still contribute to eutrophication, so additional practices could further improve conditions.
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July 30-1030-Richard Lizotte
- 1. FARMTO LAKE How Conservation Practices Affect Eutrophication
- 6. ReducedTillage Vegetated Buffers Sediment Pond Conservation Reserve BMPs
- 8. Spring Runoff TSS CRP Buffer Row Crop TotalSuspendedSedimentmg/L 10 100 1000 10000 100000 Spring Runoff NO3-N CRP Buffer Row Crop NO3-Nmg/L 0 1 2 3 4 Spring Runoff TN CRP Buffer Row Crop TotalNitrogenmg/L 0 2 4 6 8 10 12 Spring Runoff TP CRP Buffer Row Crop TotalPhosphorusmg/L 0 1 2 3 4
- 12. Beasley Lake Water Quality Total Suspended Solids Nutrients Chlorophyll a Phycocyanin Dissolved Oxygen
- 17. Concentrations?
- 18. Algal Nutrient Response Curves October 2018 November 2018 June 2019 July 2019 Nitrogen: NO3-N Phosphorus: PO4-3
- 19. Vmax Rate constant k 1 𝑘 Month Pigment 𝟏 𝒌 mg NO3-N/L October 2018 Algae 0.277 Cyanobacteria 0.241 November 2018 Algae 0.096 Cyanobacteria 0.095 June 2019 Algae 0.311 Cyanobacteria 0.212 July 2019 Algae 0.522 Cyanobacteria 0.546 Nitrate NO3-N
- 20. Month Pigment 𝟏 𝒌 mg NO3-N/L October 2018 Algae 0.277 Cyanobacteria 0.241 November 2018 Algae 0.096 Cyanobacteria 0.095 June 2019 Algae 0.311 Cyanobacteria 0.212 July 2019 Algae 0.481 Cyanobacteria 0.546 Nitrate NO3-N Year <0.100 mg NO3-N/L 1998 22% 1999 29% 2000 42% 2016 77% 2017 76% 2018 61%
- 21. Beasley Lake Phosphorus PO4 -3 mg/L 0.00 0.05 0.10 0.15 0.20 0.25 Phycocyanin(Cyanobacteria)g/L 0 10 20 30 40 50 60 70 Vmax Rate constant k 1 𝑘 Phosphate PO4-3 Month Pigment 𝟏 𝒌 mg PO4-3/L October 2018 Algae 0.048 Cyanobacteria 0.042 November 2018 Algae 0.052 Cyanobacteria 0.047 June 2019 Algae 0.063 Cyanobacteria 0.043 July 2019 Algae 0.108 Cyanobacteria 0.108
- 22. Phosphate PO4-3 Month Pigment 𝟏 𝒌 mg PO4-3/L October 2018 Algae 0.048 Cyanobacteria 0.042 November 2018 Algae 0.052 Cyanobacteria 0.047 June 2019 Algae 0.063 Cyanobacteria 0.043 July 2019 Algae 0.099 Cyanobacteria 0.108 Year <0.050 mg PO4-3/L 1998 32% 1999 17% 2000 41% 2016 84% 2017 91% 2018 65%
- 23. Are Current BMPs sufficient? Lag-Time Effects Long-Term Monitoring Flooding Events Internal Nutrient Loading/Cycling
- 24. Within-Lake Nutrients Algal Bloom Oxygen Stress Hypoxia Lake Sediment P PO4-3 release Phosphorus Cycle Algal Blooms Cyanobacteria Blooms Nitrogen Cycle Denitrification (?)
- 25. Conclusions • Integrated BMPs Reduced • Runoff Nutrient Loads • Lake Nutrient Concentrations • Lake Eutrophication • Less Intense Algal Blooms • Low Levels of Cyanobacteria • Infrequent Dissolved Oxygen Stress • Nutrient Limitation • Continued Reduction in NO3-N • Continued Reduction in PO4-3 • Within-Lake Nutrient Loads • Improvement with Additional BMPs