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Land use and nutrient patterns in upstream watersheds of St. Martin River

Land use and nutrient patterns in upstream watersheds of St. Martin River. Kris Beckert, Thomas Fisher, Roman Jesien, Ben Fertig, Judy O’Neil, Tim Carruthers, Bill Dennison. Methods. Monthly nutrient data obtained for 6 streams in St. Martin River watershed July 2006-Jan 2008

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Land use and nutrient patterns in upstream watersheds of St. Martin River

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  1. Land use and nutrient patterns in upstream watersheds of St. Martin River Kris Beckert, Thomas Fisher, Roman Jesien, Ben Fertig, Judy O’Neil, Tim Carruthers, Bill Dennison

  2. Methods • Monthly nutrient data obtained for 6 streams in St. Martin River watershed July 2006-Jan 2008 • Aerial photography used to re-draw land use polygons in GIS • Land use calculation for stream sub-watersheds in St. Martin River region • USGS average monthly discharge data for Birch Branch at Showell July 2006- Sept 2007 • Total Nitrogen and Total Phosphorus yearly loading • Regression analysis of land use vs. Dec-March nutrient concentrations

  3. St. Martin River 2005 Aerial Photography

  4. St. Martin River 2005 Aerial Photography

  5. Correction of Land Use Polygons • 2002 land use files obtained from Maryland Department of Planning • Overestimation of land use, especially feeding operations • Polygons re-drawn closer to aerial imagery Initial Feeding Operations Polygon

  6. Correction of Land Use Polygons • 2002 land use files obtained from Maryland Department of Planning • Overestimation of land use, especially feeding operations • Polygons re-drawn closer to aerial imagery New Feeding Operations Polygon Forest

  7. Stream Sites B5 B6 B3 B1 B2 USGS gage B8

  8. B1: Dam

  9. B2: Slab Bridge at Hotel Rd.

  10. B3: Carey Branch at Hotel Rd

  11. B5: Bunting Branch at Rt. 54

  12. B6: Unnamed Tributary *Lowest observed value ***Highest observed value

  13. B8: Church Branch *Lowest observed value ***Highest observed value

  14. Regressions: Nitrogen vs. Anthropogenic land use

  15. Regressions: Phosphorus vs. Anthropogenic land use

  16. Regressions: Nitrogen vs. Feeding Operations

  17. Regressions: Phosphorus vs. Feeding Operations

  18. Regressions: Nitrogen vs. Natural

  19. Regressions: Phosphorus vs. Natural

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