308-10 Effect of Long-Term Application of Biosolids On Biological Soil Quality: C Mineralization, and Particulate and Non-Particulate Soil Organic C.

See more from this Division: S03 Soil Biology & Biochemistry
See more from this Session: Soil Carbon, Nitrogen and GHG Fluxes: I
Wednesday, November 3, 2010: 10:45 AM
Long Beach Convention Center, Room 104A, First Floor
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Guanglong Tian1, Alan Franzluebbers2, T.C. Granato1, A.E. Cox1 and C. O'Connor1, (1)Chicago Metrop. Water Reclamation, Cicero, IL
(2)USDA-ARS, Watkinsville, GA
Assessment of C mineralization and fractions in biosolids-amended soil can increase our knowledge on the impact of biosolids application on soil nutrient availability and C sequestration. Soil samples were collected in 2006 from 20 strip-mined fields at Fulton County, Illinois, which received biosolids application during 1972-2004. Since the strip-mined soil was depleted in SOC at the start of the biosolids application, it provides an ideal condition to quantify the change in SOC fractions. The C mineralization was determined using laboratory incubation and particulate organic C (POC) using wet sieving. Application of biosolids considerably increased the potential C mineralization, POC, and non-POC, and such effects increased with the increase in biosolids application rate. As the C mineralization and POC are directly related to soil nutrient supply, and the non-POC is the C associated with clay and represents more stabilized and humified C, these results imply that long-term application of biosolids can increase soil capacity to both supply plant nutrients and sequester C.
See more from this Division: S03 Soil Biology & Biochemistry
See more from this Session: Soil Carbon, Nitrogen and GHG Fluxes: I