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Long-term Changes in Lamprey River Chemistry

Long-term Changes in Lamprey River Chemistry. William H. McDowell University of New Hampshire. Precipitation Gauge Wet Deposition Stream Gauge Well Field. Withdrawal. James Farm. WHB. Lamprey. Lamprey at Packers Falls. Thompson Farm. North River. Burley Demeritt.

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Long-term Changes in Lamprey River Chemistry

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  1. Long-term Changes in Lamprey River Chemistry William H. McDowell University of New Hampshire

  2. Precipitation Gauge Wet Deposition Stream Gauge Well Field Withdrawal James Farm WHB Lamprey Lamprey at Packers Falls Thompson Farm North River Burley Demeritt Sewage Treatment Plant Lamprey River Hydrologic Observatory

  3. Research Questions • Are there long-term trends in Lamprey River chemistry driven by suburbanization? • Can variability in sub-basin surface water and groundwater chemistry be predicted by watershed attributes? • What drives long-term N balance in the Lamprey River watershed?

  4. Long-term Lamprey Sampling

  5. ? Nitrate Over Time in the Lamprey River

  6. Monthly Nitrate in the Lamprey River

  7. Dissolved Organic Carbon Over Time in the Lamprey River No significant trend with time

  8. Surface water nitrate is best predicted by human population density Lamprey Sub-basins

  9. Surface water nitrate is also related to urban cover and agricultural land use Lamprey, Ossipee and Oyster Sub-basins

  10. Dissolved Organic Matter is Related to Wetland Cover Lamprey, Ossipee and Oyster Sub-basins

  11. Nitrogen Inputs and Outputs from the Lamprey River Watershed Input 14.5 kg N ha-1 yr-1 Food Retention 94% (or 13.7 kg N ha-1 yr-1)Stored or lost to atmosphere? 3.1 Fertilizer 1.8 9.6 Rain and dry deposition Output 0.8 kg N ha-1 yr-1

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