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Watershed 27
Physical Characteristics
STREAM: Hard Luck Creek
AREA: 39 ha
FIRST RECORD: 11/02/1946
NOTCH: 120 V-notch
ELEV. at WEIR: 1061 m
MAX ELEVATION: 1454 m
MAX DISCHARGE: 5.65 m3sec-1km-2
ASPECT: NNE
Parameters from Swank and Crossly (1988)
Average Annual Nutrient (kg ha-1) and Water (cm) Budget:
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Input
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Output
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Net Difference
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Water
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265
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187
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+78
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NO3-N
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4.38
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0.34
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+4.04
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NH4-N
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2.54
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0.07
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+2.47
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PO4-P
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0.12
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0.03
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+0.09
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SO4-S
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13.17
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7.06
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+6.11
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Cl
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9.44
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9.21
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+0.23
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K
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1.86
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4.3
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-2.45
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Na
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5.16
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9.07
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-3.91
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Ca
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3.31
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6.8
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-3.49
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Mg
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1.17
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3.87
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-2.70
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SiO2
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0.46
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65.5
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-65.04
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Volume-Weighted Mean Annual Concentrations (mg L-1) 1973-83:
NO-3-N = 0.02
NH+4-N = 0
PO3-4-N = 0
Cl- = 0.49
K+ = 0.23
Na+ = 0.49
Ca2+ = 0.36
Mg2+ = 0.21
SO2-4-S = 0.38
SiO2 = 3.51
Some Physiographic and Mean Hydrologic Characteristics:
Land Slope (%) = 55
Record Length (yr) = 35
Mean Annual Precipitation (cm) = 245.08
Mean Annual Runoff (cm) = 173.74
Precipitation Runoff (cm) = 71.34
Hursh's Runoff Coefficient = Mean Annual Runoff/Mean Annual Precipitation
= 0.71
Initial Flow Rate (l/s/km2) = 36.3
Quickflow Before Peak (cm) = 17.65
Quickflow After Peak (cm) = 34.15
Delayed Flow (cm) = 121.94
Storm Duration (hr) = 29.93
Time To Peak (hr) = 9.31
Absolute Peak (l/s/km2) = 242.6
Recession Time (hr) = 20.62
Mean Runoff Events/Year = 68
Response Factor: (Qflow Before Pk + Qflow After Pk) / Mean Annual
Precipitation = 0.21
Hursh's Storm Runoff Ratio: (Qflow Before Pk + Qflow After Pk)/Mean Annual
Runoff = 0.3
Summary of Treatments
Control, but partially defoliated by fall cankerworm infestation from
1972 to 1979.
Aquatic Research
Dissolved Organic
Carbon (DOC) in stream water.
Discharge for WS18 and WS27 measured with 120 degree sharp-crested
V-notch weirs:
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Watershed 18 daily stream discharge.
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Watershed 27 daily stream discharge.
Terrestrial Research
Microclimate (Gradient).
Nitrogen Transformation (Gradient).
Litterfall (Gradient) Group 1
Litterfall (Gradient) Group 2
Litterfall (Gradient) Group 3
Litterfall (Gradient) Group 4
Litterfall (Gradient) Group 5
Litterfall (Gradient) Group 6
Litterfall (Gradient) Group 7
Dendrometer Bands (Gradient).
Soil
Moisture (TDR Gradient).
Annual
rates of fine root appearance and disappearance (Gradient).
Seasonal dynamics of fine root length (Gradient).
Fine
root length (Raw Data Gradient).
Root
Mass (Raw Data Gradient).
Canopy
Gradient Thrufall.
Canopy
Gradient Frass.
Soil
Chemistry along the canopy gradient.
Tree
population dynamics along environmental gradients.
Microclimate (Gap).
Dendrometer Bands (Gap).
Soil
Moisture (TDR Gap).
Photosynthetic Active Radiation (PAR Gap).
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