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

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Presentation transcript:

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

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

Research Questions 1.Are there long-term trends in Lamprey River chemistry driven by suburbanization? 2.Can variability in sub-basin surface water and groundwater chemistry be predicted by watershed attributes? 3.What drives long-term N balance in the Lamprey River watershed?

Long-term Lamprey Sampling

Nitrate Over Time in the Lamprey River ?

Monthly Nitrate in the Lamprey River

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

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

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

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

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