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Data Extent

Data from: Soil organic carbon and isotope composition response to topography and erosion in Iowa

The dataset includes topographic information, soil properties, and 137Cs levels collected from a 15 ha cropland under soybean/maize (C3/C4) rotation in June 2002. The cropland is located in the central-western part of the Walnut Creek watershed, Story County, Iowa. 128 sampling locations were collected and three soil samples were obtained using a 3.2 cm-diameter push probe from the 0 to 30 cm soil layer within a 1 m × 1 m quadrat at each sampling location. Deeper soil samples were collected from 30 to 50 cm layers in locations where sediment deposition was observed. The three samples from each sampling location were mixed and analyzed to determine soil properties, SOC content and its carbon (C) isotope composition (C12 to C13 ratio), and 137Cs levels. For landscape topography of each sampling location, topographic metrics were derived from a digital elevation mode using LiDAR (Light Detection and Ranging) data. These data are useful in investigating the fate of eroded SOC in croplands and its responses to landscape topography.

Dataset Info

These fields are compatible with DCAT, an RDF vocabulary designed to facilitate interoperability between data catalogs published on the Web.
Li, Xia
McCarty, Gregory W.
Product Type
Spatial / Geographical Coverage Area
POLYGON ((-93.682846 41.954022, -93.678094 41.954022, -93.678094 41.95063, -93.682846 41.95063))
Spatial / Geographical Coverage Location
Central-western Walnut Creek watershed, Story County, Iowa
Temporal Coverage
Equipment or Software Used
Intended Use
These data are collected according to method described in Li et al. (2018), Journal of Geophysical Research-Biogeosciences, and can be used to study topography-controlled soil erosion and affected SOC and its carbon (C) isotope composition (C12 to C13 ratio) in a cropland under soybean/maize (C3/C4) rotation.
Ag Data Commons
Contact Name
McCarty, Gregory W.; Li, Xia
Contact Email
Public Access Level
Primary Article

Li, X., McCarty, G. W., Karlen, D. L., Cambardella, C. A., & Effland, W. (2018). Soil organic carbon and isotope composition response to topography and erosion in Iowa. Journal of Geophysical Research: Biogeosciences, 123(12): 3649-3667.

Related Article

Li, X., McCarty, G. W., Karlen, D. L., & Cambardella, C. A. (2018) Topographic metric predictions of soil redistribution and organic carbon in Iowa cropland fields. Catena, 160, 222-232.

Li, X., & McCarty, G. W. (2019). Application of Topographic Analyses for Mapping Spatial Patterns of Soil Properties. In: Earth Observation and Geospatial Analyses [Working Title], Pepe A., & Zhao Q. (eds.). London, UK: IntechOpen. [https://www.intechopen.com/online-first/application-of-topographic-analy...

Methods Citation

Ritchie, J. C., McCarty, G. W., Venteris, E. R., & Kaspar, T. C. (2007). Soil and soil organic carbon redistribution on the landscape. Geomorphology, 89, 163–171.

AgID: 10113/3756

Follett, R. F., Kimble, J., Leavitt, S. W., & Pruessner, E. (2004). Potential use of soil C isotope analyses to evaluate paleoclimate. Soil Science, 169(7), 471–488.

Conrad, O., Bechtel, B., Bock, M., Dietrich, H., Fischer, E., Gerlitz, L., Wehberg, J., Wichmann, V., & Böhner, J. (2015). System for Automated Geoscientific Analyses (SAGA) v. 2.1.4, Geoscientific Model Development, 8, 1991-2007.

Funding Source(s)
Natural Resources Conservation Service
Dataset DOI (digital object identifier)
Program Code
005:037 - Department of Agriculture - Research and Education
Bureau Code
005:00 - Department of Agriculture
Modified Date
Release Date
Ag Data Commons Keywords: 
  • Agroecosystems & Environment
  • Agroecosystems & Environment
  • Soil
  • Agroecosystems & Environment
  • Soil
  • Biogeochemistry
State or Territory: 
ISO Topic(s):