419-3 Soil C Assessment and Mapping in the Central Sands of Wisconsin.

See more from this Division: SSSA Division: Pedology
See more from this Session: Pedology: II (includes student competition)
Wednesday, November 5, 2014: 1:35 PM
Long Beach Convention Center, Room 202C
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Alfred E. Hartemink, 1525 Observatory Drive, University of Wisconsin-Madison, Madison, WI, Kabindra Adhikari, University of Wisconsin-Madison, Madison, WI, Heather Watson, Evensdale Campus WVU, West Virginia University, Morgantown, WV and Nicholas Bero, Department of Soil Science, University of Wisconsin-Madison, Madison, WI
There is a need for rapid and accurate assessments of soil organic carbon. The central sands of Wisconsin are intensively cultivated with high levels of inorganic fertilizers and irrigation. The soils are sandy (>85% sand) and mostly classified as Psamments. We have collected 300 pedon and topsoil samples using random, grid and Latin hypercube  sampling designs to assess soil C contents and stocks.  A range of maps were available including fine resolution EMI (dualem) and 1.5 m  LiDAR images.  Topsoil thickness varied 17 to 72 cm (mean 28 cm) and C contents ranged from 0.6 to 1.1%. Maximum stocks were over 60 Mg/ha after 30 years of intensive cultivation and appear higher than in similar soils under grassland or pine forest. The implications of the sampling design in relation to the mapping of SOC in these sandy soils will be discussed.

See more from this Division: SSSA Division: Pedology
See more from this Session: Pedology: II (includes student competition)