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Redistribution of Soil Organic Carbon in Low-gradient Systems Resulting from Interplay of Aggregate Dynamics and Erosion

Event Type
Department of Geography & GIS
Lecture Hall 2079 Natural History Buildubg
Oct 1, 2021   3:00 - 4:00 pm  
Dr. Shengnan Zhou, Department of Crop Sciences, UIUC
This event is free and open to public
Department of Geography & GIS
Originating Calendar
Geography and Geographic Information Science

The spatial distribution of SOC is controlled by aggregate breakdown and transport under effects of soil characteristics, rainfall patterns, topography, and management. Capturing the interplay of aggregate dynamics and erosion requires a novel and holistic approach exploring aggregates breakdown, formation, and transport mechanisms across scales. The Intensively Managed Landscape Critical Zone Observatory (IMLCZO) in Midwest US was designed for studies to understand critical zone processes considering glacial and management legacies. This research examined SOC variability in two IMLCZO sites (Clear Creek, Iowa, and Upper Sangamon River, Illinois) concerning the influence of glaciation-remnant topography. Focusing on the low-gradient Upper Sangamon, aggregate turnover by raindrop impact and wetting-drying cycles and subsequent transport by surface runoff were investigated in field conditions using rare earth element tracing and simulated rainfall. This research advanced our understanding of erosional redistribution of SOC and soil management in IMLs.

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