Long-term Changes in Lamprey River Chemistry
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Long-term Changes in Lamprey River Chemistry William H. McDowell University of New Hampshire
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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. - PowerPoint PPT Presentation
Transcript of Long-term Changes in Lamprey River Chemistry
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 GaugeWet DepositionStream GaugeWell 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?
Kg ha-1 yr-1 2000 2001 2002 2003 2004 2005 2006DOC 31.5 24.0 15.0 27.6 36.2 38.5 37.0DIC 9.5 10.3 16.5 19.7Particulate C 1.89 4.77 4.16 5.95DON 1.17 1.33 0.50 0.71 1.68 1.23 1.61NO3-N 0.47 0.54 0.32 0.63 0.58 0.70 0.96NH4-N 0.09 0.19 0.08 0.08 0.12 0.12 0.10Particulate N 0.17 0.50 0.35 0.58PO4-P 0.04 0.03 0.02 0.02 0.04 0.02 0.03Cl 118 119 136 174SO4-S 12.4 9.9 11.4 23.3Na 71.5 60.6 86.5 108.7K 6.22 7.13 7.11 11.38Mg 6.26 5.94 7.59 10.67Ca 27.0 24.3 33.1 47.7SiO2 28.2 24.2 34.6 52.1TSS 15.2 42.3 35.8 54.6m runoff yr-1 0.54 0.46 0.26 0.49 0.58 0.66 1.06
Long-term Lamprey Sampling
Nitrate Over Time in the Lamprey River
?
1/00 1/01 1/02 1/03 1/04 1/05 1/06 1/07
m3 s
-1
0
50
100
150
200
250
NO
3-N
mg
L-1
0.0
0.1
0.2
0.3
0.4
0.5
0.6
Monthly Nitrate in the Lamprey River
01-99 01-00 01-01 01-02 01-03 01-04 01-05 01-06 01-07 01-08
NO
3-N
(m
g L
-1)
0.0
0.1
0.2
0.3
0.4Y = 0.000025 X - 60.7r ²= 0.086; p<0.01
1/00 1/01 1/02 1/03 1/04 1/05 1/06 1/07
m3 s
-1
0
50
100
150
200
250
DO
C m
g L
-1
0
2
4
6
8
10
12
14
Dissolved Organic Carbon Over Time in the Lamprey River
No significant trend with time
Surface water nitrate is best predicted by human population density
Log People km-2
1.0 1.5 2.0 2.5
Lo
g N
O3-
N k
g h
a-1 y
r-1
-1.5
-1.0
-0.5
0.0
0.5
1.0
20032000 Y = 1.41 X - 2.78
r2
= 0.77; p<0.01
Y = 1.59 X - 3.17r2 = 0.81; p<0.01
Lamprey Sub-basins
Surface water nitrate is also related to urban cover and agricultural land use
Log % Urban
-1 0 1 2
Lo
g N
O3-
N k
g h
a-1
yr-1
-1.5
-0.5
0.5
1.5
Y = 0.51 X - 0.47R ² = 0.39p < 0.01
Log % Agriculture
-2 -1 0 1 2
Y = 0.40 X - 0.40R ² = 0.25p < 0.01
Lamprey, Ossipee and Oyster Sub-basins
Dissolved Organic Matter is Related to Wetland Cover
% Wetland
0 5 10 15 20 25
DO
C m
g L
-1
0
3
6
9
12
DO
N (
mg
L-1
)
0.05
0.15
0.25
0.35
DONY = 0.0077 X + 0.12
R² = 0.31p < 0.01
DOCY = 0.32 X + 3.17
R² = 0.48p < 0.01
Lamprey, Ossipee and Oyster Sub-basins
Nitrogen Inputs and Outputs from the Lamprey River Watershed
FoodFertilizer
Rain and dry deposition
Input14.5 kg N ha-1 yr-1
Output0.8 kg N ha-1 yr-1
Retention94% (or 13.7 kg N ha-1 yr-1)
Stored or lost to atmosphere?
3.11.8
9.6
