Neal Blair will oversee a portion of the C-biogeochemistry on the project. Tasks include: Theme ϕ - Active Root Zone MIRZ experiments 1. Broad spectrum biomarker analyses (lignin, lipids, carbohydrates, proteins) of soil core samples (107 samples total from 4 cores) will be made. The information obtained, along with those made by others in the group, will help define the contributions of plant roots and microbes to the subsurface C-cycle. Theme γ - River Corridor Depocenter (floodplain) cores 1. Radiocarbon (14C) measurements will be made on plant debris (e.g. wood) in cores (50 samples from 10 cores) to establish core chronology and age models. Debris samples will be picked from sediment, cleaned, and analyzed at the NOSAMS Radiocarbon facility. 2. Organic carbon and total nitrogen concentrations, and 13C/12C and 15N/14N isotope ratios will be measured on sectioned cores (600 samples from 15 cores) to determine C and N burial fluxes when combined with the radiocarbon measurements above, and to constrain the sources of organic inputs. 3. Broad spectrum biomarker analyses (lignin, lipids, carbohydrates, proteins) of soil core samples (200 samples total from 5 cores) will be made. These measurements will be used with the isotope information above to identify the sources of organic C to the floodplain soils/sediments and to evaluate diagenetic (weathering) processes. 4. Whole core scanning for magnetic susceptibility, high resolution line imagery, color, and XRF will be performed on select cores to identify depositional events, sources of sediment and diagenetic effects. The scanning will either be done at Northwestern in the Quaternary Lab facility or at LacCore depending on scanner availability at the time of core collection. Theme γ - River Corridor Storm events 1. Sediment concentrations will be measured on water samples collected during storm events (256 samples from 2 storm events). This information along with water discharge obtained by the ISWS will be used to calculate sediment flux. 2. Organic carbon and total nitrogen concentrations, and 13C/12C and 15N/14N isotope ratios will be measured on suspended sediments (256 samples from 2 storm events) to determine organic C and total N content as well as sources. 3. Broad spectrum biomarker analyses (lignin, lipids, carbohydrates, proteins) of soil core samples (256 samples total from 2 storms) will be made. These measurements will be used with the isotope information above to identify the sources of organic C. 4. FTIR spectra will be collected (256 samples total from 2 storms) to evaluate changes in mineralogy and organic C composition over the course of the storms. Measurements will be spread out over the lifetime of the project. Blair will also supervise data interpretation with the supported PhD student and collaborators. He will also oversee manuscript preparation and submission for this portion of the project.
|Effective start/end date||9/1/20 → 8/31/25|
- University of Illinois at Urbana-Champaign (101348-18067//EAR-2012850)
- National Science Foundation (101348-18067//EAR-2012850)
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