long-term ecological research: eco-hydrology · long-term ecological research: eco-hydrology julia...
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![Page 1: Long-term Ecological Research: Eco-hydrology · Long-term Ecological Research: Eco-hydrology Julia Jones Geosciences. Oregon State University. H.J. Andrews LTER](https://reader036.vdocument.in/reader036/viewer/2022063008/5fbea5a8ddf2d029ee424b18/html5/thumbnails/1.jpg)
Long-term Ecological Research: Eco-hydrology
Julia JonesGeosciences
Oregon State UniversityH.J. Andrews LTER
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How to reconcileworld views?
Ecologists -• vertical fluxes of C, N, water• Biotic interactions with atmosphere and soils
Hydrologists, geomorphologists• horizontal fluxes of water, sediment, organics• Physical interactions - gravity v. resistance
Common to both• Time scales, spatial scales, budgets
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What are common questions?
Biotic v. abiotic controls on fluxes of C, N, water?
Land use, climate change and natural disturbance effects and feedbacks?
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Reciprocal Mechanisms
Q = P - ET - I - SW - GW
Streamflow = f(precipitation, water use by vegetation, vegetation structure, routing of water)
Photosynthesis and respiration = f(soil moisture and temperature, atmospheric moisture and temperature)
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What can LTER contribute?
Up to 70 year records of climate and streamflow in small watersheds (thousands of watershed-years)Multiple sites varying in climate, land use and disturbance historyProcess knowledge to formulate and test ecosystem questions
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Eco-hydrology: time scales
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Eco-hydrology Mechanisms
Cause ConsequenceDiel ET Habitat
Storm ET, I, SW Disturbance
Season Phenology, climate
Habitat
Succession, climate change
Veg. structure, composition
Habitat
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Diel Flows and Riparian Zone
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Floods and Vegetation Removal
Q
Time (hours)
Vegetation water use influences antecedent moisture, recession
Unvegetated
Vegetated
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Contrasting Forest Typeand Climate Effects on
Streamflow
Forest Soil SnowAndrews Evergreen Deep Yes
Hubbard Brook Deciduous Shallow Yes
Coweeta Deciduous Deep No
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Effects of Forest Removal by Season Over Succession
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Abs
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av
erag
e st
ream
flow
(mm
)Andrews Watershed 1 vs.
Watershed 2
Actual ETSnowmelt
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Andrews Watershed 1 vs. Watershed 2
Actual ETSnowmelt
Abs
olut
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in d
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av
erag
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(mm
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Andrews Watershed 1 vs. Watershed 2
Abs
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(mm
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Actual ETSnowmelt
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actual ET snowmelt
6-10 yrs, 1972-76
Andrews Watershed 1 vs. Watershed 2
Abs
olut
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in d
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flow
(mm
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Actual ETSnowmelt
1-5 yrs, 1967-71
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25-30 yrs, 1992-96
Andrews Watershed 1 vs. Watershed 2
Abs
olut
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in d
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(mm
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Actual ETSnowmelt
6-10 yrs, 1972-76
1-5 yrs, 1967-71
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Hubbard Brook Watershed 2 vs. Watershed 3
Abs
olut
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in d
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av
erag
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ream
flow
(mm
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Actual ETSnowmelt
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Hubbard Brook Watershed 2 vs. Watershed 3
Abs
olut
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in d
aily
av
erag
e st
ream
flow
(mm
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Actual ETSnowmelt
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Hubbard Brook Watershed 2 vs. Watershed 3
Abs
olut
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in d
aily
av
erag
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ream
flow
(mm
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1-5 yrs, 1965-69
Actual ETSnowmelt
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Hubbard Brook Watershed 2 vs. Watershed 3
Abs
olut
e ch
ange
in d
aily
av
erag
e st
ream
flow
(mm
)
1-5 yrs, 1965-69
Actual ETSnowmelt
6-10 yrs, 1970-74
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Hubbard Brook Watershed 2 vs. Watershed 3
Abs
olut
e ch
ange
in d
aily
av
erag
e st
ream
flow
(mm
)
1-5 yrs, 1965-69
Actual ETSnowmelt
6-10 yrs, 1970-74
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Coweeta Watershed 7 vs. Watershed 2
Abs
olut
e ch
ange
in d
aily
av
erag
e st
ream
flow
(mm
)
Actual ETSnowmelt (none)
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Coweeta Watershed 7 vs. Watershed 2
Abs
olut
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in d
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av
erag
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ream
flow
(mm
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Actual ETSnowmelt (none)
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Coweeta Watershed 7 vs. Watershed 2
Abs
olut
e ch
ange
in d
aily
av
erag
e st
ream
flow
(mm
)
Actual ETSnowmelt (none)
1-5 yrs, 1965-69
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Coweeta Watershed 7 vs. Watershed 2
Abs
olut
e ch
ange
in d
aily
av
erag
e st
ream
flow
(mm
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Actual ETSnowmelt (none)
6-10 yrs, 1970-741-5 yrs, 1965-69
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Coweeta Watershed 7 vs. Watershed 2
Abs
olut
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ange
in d
aily
av
erag
e st
ream
flow
(mm
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Actual ETSnowmelt (none)
6-10 yrs, 1970-741-5 yrs, 1965-69
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Evidence for Climate Variability and Ecosystem Response
Ann
ual P
reci
pita
tion
(cm
)
Andrews Coweeta Hubbard Brook
Run
off R
atio
(%)
Precipitation vs. Runoff: Long-term Trends
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Next Steps
Centralized data access: • Clim-DB, Hydro-DB
More sites, new sitesNew questions, new techniquesIntegrate modeling, process studies
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AcknowledgementsNSF LTER grants • Andrews, Coweeta, Hubbard Brook, Luquillo
U.S. Forest Service support • Andrews, Coweeta, Hubbard Brook, Luquillo
NSF award 1996-98 for LTER intersite hydrology comparisonsColleagues • Andrews, Coweeta, Hubbard Brook, Luquillo,
Harvard Forest LTERs