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Abstract
Historic agricultural practices throughout the Piedmont region of the southeastern United States from ~1820 to 1940 led to accelerated erosion. Practices, such as tilling, degraded soil quality altering hydrologic processes on the landscape by limiting infiltration and leading to overland flow and erosion. Erosion due to these practices has substantially redistributed sediment from upper to lower landscape positions, causing a change in the depth-to-argillic horizon along hillslopes. By mapping the depth to argillic horizon within watersheds that have a history of farming and watersheds with little evidence of agricultural disturbance, a better understanding of the effects of farming practices on erosion and sediment redistribution can be made. This study uses extensive soil sampling within historically farmed and unfarmed watersheds to map spatial variations in the depth to argillic horizon. In addition to sampling, Electro-magnetic Induction (EMI) is being tested and calibrated to clay content and other topographic characteristic (i.e. landscape position, aspect, percent slope) from which the depth to argillic horizon can be predicted. Current hillslope and watershed hydrologic models use characteristics from soil classification maps for parameterization, however, these soil maps may lack sufficient spatial detail and may not accurately represent landscapes that have been eroded from historical farming. The results from this study will improve understanding of previous erosion on sediment redistribution and will characterize the potential use of electromagnetic induction as an accurate and efficient means to predict the depth to the argillic horizon. This information will improve parameterization of hillslope and watershed hydrologic models.
Subject Keywords
Coverage
Spatial
Temporal
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Content
ReadMe.md
CCZO -- Soil Texture -- Argillic Horizon -- Calhoun CZO -- (2016-2017)
OVERVIEW
Description/Abstract
Historic agricultural practices throughout the Piedmont region of the southeastern United States from ~1820 to 1940 led to accelerated erosion. Practices, such as tilling, degraded soil quality altering hydrologic processes on the landscape by limiting infiltration and leading to overland flow and erosion. Erosion due to these practices has substantially redistributed sediment from upper to lower landscape positions, causing a change in the depth-to-argillic horizon along hillslopes. By mapping the depth to argillic horizon within watersheds that have a history of farming and watersheds with little evidence of agricultural disturbance, a better understanding of the effects of farming practices on erosion and sediment redistribution can be made. This study uses extensive soil sampling within historically farmed and unfarmed watersheds to map spatial variations in the depth to argillic horizon. In addition to sampling, Electro-magnetic Induction (EMI) is being tested and calibrated to clay content and other topographic characteristic (i.e. landscape position, aspect, percent slope) from which the depth to argillic horizon can be predicted. Current hillslope and watershed hydrologic models use characteristics from soil classification maps for parameterization, however, these soil maps may lack sufficient spatial detail and may not accurately represent landscapes that have been eroded from historical farming. The results from this study will improve understanding of previous erosion on sediment redistribution and will characterize the potential use of electromagnetic induction as an accurate and efficient means to predict the depth to the argillic horizon. This information will improve parameterization of hillslope and watershed hydrologic models.
Creator/Author
Ryland, Rachel C.
CZOs
Calhoun
Contact
Rachel Ryland, Department of Crop & Soil Sciences, University of Georgia, Athens, GA, rryland@uga.edu
SUBJECTS
Disciplines
Soil Science / Pedology
Topics
Soil Texture
Subtopic
Argillic Horizon
Keywords
Argyllic|Clay|Depth|Soil Texture|Slope|Aspect|Landscape Position|EMI
Variables
Slope(%)|Aspect(degree)|Tile Push Probe Depth(cm)|Depth to Bt|Landscape Position|Clay(%)|Sand(%)|Silt(%)|EMI
Variables ODM2
Aspect|Clay|Depth, soil|Electromagnetic induction geophysics, EMI|land classification|Sand|Silt|Slope
TEMPORAL
Date Start
2016-01-30
Date End
2017-03-15
SPATIAL
Field Areas
Calhoun CZO Research Area 2|Calhoun CZO Research Area 3|Calhoun CZO Research Area 4
Location
Calhoun CZO
North latitude
34.647929
South latitude
34.363355
West longitude
-81.962154
East longitude
-81.412756
REFERENCE
CZO ID
5982
Additional Metadata
Name | Value |
---|---|
czos | Calhoun |
czo_id | 5982 |
keywords | Argyllic, Clay, Depth, Soil Texture, Slope, Aspect, Landscape Position, EMI |
variables | Slope(%), Aspect(degree), Tile Push Probe Depth(cm), Depth to Bt, Landscape Position, Clay(%), Sand(%), Silt(%), EMI |
disciplines | Soil Science / Pedology |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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