Fractionation and Long‐Term Laboratory Incubation to Measure Soil Organic Matter Dynamics

Autor: Eldor A. Paul, Harold P. Collins, Sara F. Wright, S. Haile-Mariam
Rok vydání: 2008
Předmět:
Zdroj: Soil Science Society of America Journal. 72:370-378
ISSN: 1435-0661
0361-5995
DOI: 10.2136/sssaj2007.0126
Popis: Soil organic matter (SOM) in agricultural soils comprises a significant part of the global terrestrial C pool. It has often been characterized by utilizing a combination of chemical dispersion of the soil followed by physical separation. We fractionated soil samples under continuous corn (Zea mays L.) rotations at four long-term sites in the Corn Belt to determine the concentration ofC and N associated with soil fractions (light fraction [LF], particulate organic matter [POM], silt size, clay size, and Bradford reactive soil protein [BRSP]) and to identify the change in C concentration and δ 13 C signal of each fraction using laboratory incubations. Light fractions comprised 3 to 5% of the soil organic carbon (SOC), with no significant difference between conventional tillage (CT) and no-till (NT) treatments. The POM fraction accounted for 5 to 11% of the SOC in the soils with >30% clay and 17 to 23% for the soils with
Databáze: OpenAIRE
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