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Impacts of landscape attributes on carbon sequestration during the transition from conventional to conservation management practices on a Coastal Plain field

J.A. Terra, D.W. Reeves, J.N. Shaw and R.L. Raper
Journal of Soil and Water Conservation November 2005, 60 (6) 438-446;
J.A. Terra
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D.W. Reeves
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J.N. Shaw
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R.L. Raper
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ABSTRACT:

Field-scale experiments on degraded soils comparing management systems would facilitate a better understanding of the soil organic carbon (C) landscape dynamics associated with transition to conservation systems. We assessed the effects of soil management practices and terrain attributes on soil organic C in a 9 ha (22.2 ac) Alabama field (Typic and Aquic Paleudults). Treatments were established in strips across the landscape in a corn (Zea mays L.)-cotton (Gossypium hirsutum L.) rotation. Treatments included a conventional system (chisel plowing/disking without cover crops) with or without dairy manure, and a conservation system (no-till and cover crops) with and without manure. A soil survey, topography, soil electrical conductivity, initial soil organic C and soil texture were used to delineate management zones or clusters. After one rotation cycle (30 months), averaged across 240 positions distributed over the entire field, no-till or conventional tillage + manure increased soil organic C (0 to 5 cm; 0 to 2 in depth) by -50 percent compared to conventional tillage (7.34 and 7.62 vs. 5.02 Mg ha−1; 3.28 and 3.40 vs. 2.24 t ac−1, respectively); but no-till+manure increased soil organic C by 157 percent. Initial soil organic C content was the most common correlated variable with soil organic C changes (SOC) across the landscape for all treatments and conservation systems had greater soil organic C increases relative to conventional systems at low soil quality landscape positions. Our results show the potential to sequester C using high-residue producing conservation systems and manure is scale dependent, and may be higher than previously expected for degraded soils in the southeastern United States.

Footnotes

  • Jose A. Terra is a research agronomist at the National Institute of Agricultural Research in Uruguay. D. Wayne Reeves is a research leader for the U.S. Department of Agriculture Agricultural Research Service (USDA-ARS), Natural Resources Conservation Center in Watkinsville, Georgia. Joey N. Shaw is a soil scientist at the Department of Agronomy at Auburn University in Auburn, Alabama. Randy L. Raper is an agricultural engineer at the USDA-ARS, National Soil Dynamics Laboratory in Auburn, Alabama.

  • Copyright 2005 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 60 (6)
Journal of Soil and Water Conservation
Vol. 60, Issue 6
November/December 2005
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Impacts of landscape attributes on carbon sequestration during the transition from conventional to conservation management practices on a Coastal Plain field
J.A. Terra, D.W. Reeves, J.N. Shaw, R.L. Raper
Journal of Soil and Water Conservation Nov 2005, 60 (6) 438-446;

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Impacts of landscape attributes on carbon sequestration during the transition from conventional to conservation management practices on a Coastal Plain field
J.A. Terra, D.W. Reeves, J.N. Shaw, R.L. Raper
Journal of Soil and Water Conservation Nov 2005, 60 (6) 438-446;
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