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WATERSHED ECOSYSTEM NUTRIENT DYNAMICS (WEND)

WATERSHED ECOSYSTEM NUTRIENT DYNAMICS (WEND). Modeling Phosphorus (P) at a Watershed Scale: A Mass Balance Approach. WEND. A New Tool for Phosphorus (P) Management Using Off-the-Shelf Software Used to Balance the Input and Output of P into, out of, and within a Watershed.

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WATERSHED ECOSYSTEM NUTRIENT DYNAMICS (WEND)

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  1. WATERSHED ECOSYSTEM NUTRIENT DYNAMICS (WEND) Modeling Phosphorus (P) at a Watershed Scale: A Mass Balance Approach USDA, NRCS, Watershed Science Institute

  2. WEND • A New Tool for Phosphorus (P) Management Using Off-the-Shelf Software • Used to Balance the Input and Output of P into, out of, and within a Watershed USDA, NRCS, Watershed Science Institute

  3. Basic Watershed Concepts • Watersheds Store and Cycle P based on: • biological, physical, chemical mechanisms • management • land use development. • Phosphorus is stored in soils, sediments, biomass and wastes. USDA, NRCS, Watershed Science Institute

  4. Basic Watershed Concepts • Phosphorus cycles and changes form due to biological, physical and chemical mechanisms. • Phosphorus cycles and changes location within and among land uses (sectors) within a watershed. USDA, NRCS, Watershed Science Institute

  5. Sectors that Process Phosphorus • Agricultural • Cropland • Pasture • Animal Operations • Urban and Industrial • Woodland USDA, NRCS, Watershed Science Institute

  6. P movement into, out of and within these sectors can be modeled using mass balance and dynamic simulation techniques. USDA, NRCS, Watershed Science Institute

  7. Conceptual Model USDA, NRCS, Watershed Science Institute

  8. Four Watersheds Modeled to Date USDA, NRCS, Watershed Science Institute

  9. Models Developed for Different Land Uses and Animal Operations 1. The WEND-1 models the 275,000 ha (679,000 ac) Winooski River Watershed in Vermont, USA • Dairy • Silage Corn, • Hay, Pasture USDA, NRCS, Watershed Science Institute

  10. Models Developed for Different Land Uses and Animal Operations 2. The WEND-IBW models the 77,000 ha (190,000 ac) Inland Bays Watershed in Delaware, USA • Poultry • Corn-Wheat- Soybean Rotation USDA, NRCS, Watershed Science Institute

  11. Models Developed for Different Land Uses and Animal Operations 3. The WEND-LCW models the 23,800 ha (58,700 ac) Little Cobb River Watershed in Minnesota, USA • Swine • Oats, Soybeans, & Corn USDA, NRCS, Watershed Science Institute

  12. Models Developed for Different Land Uses and Animal Operations 4.The WEND-Eucha models the 93800 ha (231,700 ac) Lake Eucha Watershed in Arkansas and Oklahoma, USA • Poultry • Pasture USDA, NRCS, Watershed Science Institute

  13. Characteristics of Watersheds Modeled USDA, NRCS, Watershed Science Institute

  14. Characteristics of Watersheds Modeled USDA, NRCS, Watershed Science Institute

  15. USDA, NRCS, Watershed Science Institute

  16. Monitored Data vs. Modeled Estimates USDA, NRCS, Watershed Science Institute

  17. Management AlternativesSimulated with WEND • Erosion Control • Manure Export USDA, NRCS, Watershed Science Institute

  18. Management AlternativesSimulated with WEND • Increased Treatment of Point Sources • Animal Reduction USDA, NRCS, Watershed Science Institute

  19. USDA, NRCS, Watershed Science Institute

  20. USDA, NRCS, Watershed Science Institute

  21. USDA, NRCS, Watershed Science Institute

  22. USDA, NRCS, Watershed Science Institute

  23. Conclusions • WEND Models Are Valid For Evaluating P Management Scenarios For Watersheds • P Management Strategies Must Be Tailored To Fit Conditions in a Individual Watershed USDA, NRCS, Watershed Science Institute

  24. Conclusions • P Sources Change Over Time • A Reduction in Non-Point Source P Export to a Drainage Net May Take Years USDA, NRCS, Watershed Science Institute

  25. For Additional Information David Anderson NRCS Watershed Science Institute 402-437-5178x46 danderso@unlserve.unl.edu USDA, NRCS, Watershed Science Institute

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