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Watershed Response to Legacy Phosphorus and Best Management Practices in an Impacted Agricultural Watershed in Florida, U.S.A

Author

Listed:
  • Yogesh P. Khare

    (The Everglades Foundation, Science Department, 18001 Old Cutler Road Suite 625, Palmetto Bay, FL 33157, USA)

  • Rajendra Paudel

    (The Everglades Foundation, Science Department, 18001 Old Cutler Road Suite 625, Palmetto Bay, FL 33157, USA)

  • Ruscena Wiederholt

    (The Everglades Foundation, Science Department, 18001 Old Cutler Road Suite 625, Palmetto Bay, FL 33157, USA)

  • Anteneh Z. Abiy

    (The Everglades Foundation, Science Department, 18001 Old Cutler Road Suite 625, Palmetto Bay, FL 33157, USA)

  • Thomas Van Lent

    (The Everglades Foundation, Science Department, 18001 Old Cutler Road Suite 625, Palmetto Bay, FL 33157, USA)

  • Stephen E. Davis

    (The Everglades Foundation, Science Department, 18001 Old Cutler Road Suite 625, Palmetto Bay, FL 33157, USA)

  • Younggu Her

    (Tropical Research and Education Center, Department of Agricultural and Biological Engineering, University of Florida, Homestead, FL 33031, USA)

Abstract

Soil phosphorus (P) built up due to past management practices, legacy P, in the Lake Okeechobee Watershed (LOW) in south-central Florida, U.S.A., is often discussed as the root cause of lake eutrophication. Improvement of the lake’s water quality requires the identification of critical P sources and quantifying their contributions. We performed a global sensitivity analysis of the Watershed Assessment Model (WAM), a common evaluation tool in LOW environmental planning, using the Morris method. A pre-calibrated WAM setup (Baseline) of the LOW sub-watershed, Taylor Creek Nubbin Slough (TCNS), was used as a test case. Eight scenarios were formulated to estimate the contributions of various P sources. The Morris analysis indicated that total phosphorus (TP) loads were highly sensitive to legacy P in improved pastures, the major land use covering 46.2% of TCNS. The scenario modeling revealed that legacy P, inorganic fertilizers, and other sources contribute 63%, 10%, and 32%, respectively, to the Baseline TP load of 111.3 metric tons/y to the lake. Improved pastures, dairies, citrus, and field crops are the top TP load contributors. Our results have important implications for water quality improvement plans in the LOW and highlighted the need for accurate spatial mapping of legacy P and incorporation of such information in modeling efforts for watersheds demonstrating legacy P problems.

Suggested Citation

  • Yogesh P. Khare & Rajendra Paudel & Ruscena Wiederholt & Anteneh Z. Abiy & Thomas Van Lent & Stephen E. Davis & Younggu Her, 2021. "Watershed Response to Legacy Phosphorus and Best Management Practices in an Impacted Agricultural Watershed in Florida, U.S.A," Land, MDPI, vol. 10(9), pages 1-22, September.
    • Handle: RePEc:gam:jlands:v:10:y:2021:i:9:p:977-:d:637108
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    References listed on IDEAS

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    1. Paul J. A. Withers & Colin Neal & Helen P. Jarvie & Donnacha G. Doody, 2014. "Agriculture and Eutrophication: Where Do We Go from Here?," Sustainability, MDPI, vol. 6(9), pages 1-23, September.
    2. Xiao, Sinan & Lu, Zhenzhou & Xu, Liyang, 2016. "A new effective screening design for structural sensitivity analysis of failure probability with the epistemic uncertainty," Reliability Engineering and System Safety, Elsevier, vol. 156(C), pages 1-14.
    3. Shi, Wen & Chen, Xi, 2019. "Controlled Morris method: A new factor screening approach empowered by a distribution-free sequential multiple testing procedure," Reliability Engineering and System Safety, Elsevier, vol. 189(C), pages 299-314.
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