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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.
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
Motivation
Hurricane Matthew (2016)
Hurricane Sandy (2012)
(Dhillon and Inamdar 2013)
(Vargas 2012)
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
- In situ field measurements across topographic gradients
Fairhill State Park, MD
- 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)
- In situ field measurements
(Werner et al. in review)
- In situ field measurements
2015 2015
Werner et al (in preparation)
- In situ field measurements
Werner et al (in preparation)
- 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)
- 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.
Petrakis et al (in preparation)
- Automated measurements of multiple soil GHG
- Automated measurements of multiple soil GHG
Petrakis et al (in preparation)
- Concluding remarks