coupling solid-aqueous-gas phases of carbon and nitrogen across topographic gradients and extreme...
TRANSCRIPT
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Coupling Solid-Aqueous-Gas Phases Of Carbon And Nitrogen Across Topographic Gradients And
Extreme Weather Events
Rodrigo VargasDepartment of Plant and Soil Sciences
University of Delaware
CoPI: Shreeram Inamdar Collaborators: Angelia Seyffeth, Jinjun Kan, Josep Barba
Students: Sandra Petrakis, Daniel Warner
Contact: [email protected]
AFRI and NIWQP PD meetingOctober 12-13, 2016Washington, D.C.
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Overall goal:
To understand how weather variability (especially extreme weather events) influences the key ecosystem processes of nutrient and soil GHG fluxes in ex-urban forests.
Approach:- In situ field measurements across topographic gradients- Experiment of extreme water pulses on soils- Automated measurements of multiple soil GHG
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Motivation
Hurricane Matthew (2016)
Hurricane Sandy (2012)
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(Dhillon and Inamdar 2013)
(Vargas 2012)
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Conceptual diagram of how topographic position will influence GHG fluxes, soilwater content, C and N pools, and variance. The size of the symbol represents the relative magnitude of the variable
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- In situ field measurements across topographic gradients
Fairhill State Park, MD
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- In situ field measurements
CO2 (Emissions):• Soils => 64%• CWD => 8%• Stems => 28%
CH4 (Consumption):• Soils => 99%• CWD => 1%• Stems => -4%
(Werner et al. in review)
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- In situ field measurements
(Werner et al. in review)
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- In situ field measurements
2015 2015
Werner et al (in preparation)
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- In situ field measurements
Werner et al (in preparation)
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- Experiment of extreme water pulses on soils
Petrakis et al (in review)
Location Name Soil texture
Upslope Upland Forest Site 1 Sandy loam
Mid-slope Upland Forest Site 2 Loam
Wetland Wetland Loamy sand
Creek Creek Sand
244% for CO2 (Creek)>5x104 % for CH4 (Wetland) >5x104 % for N2O (Forest)
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- Experiment of extreme water pulses on soils
Petrakis et al (in review)
Creek soil contributed the most to a 20-year global warming potential
Forest Site contributed the most to the 100-year GWP (53.7%) as a result of large N2O emissions.
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Petrakis et al (in preparation)
- Automated measurements of multiple soil GHG
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- Automated measurements of multiple soil GHG
Petrakis et al (in preparation)
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- Concluding remarks