354-8 CO2 Emission In Soils Under Sewage Sludge Amendment In Afforested Areas.



Wednesday, October 19, 2011: 3:00 PM
Henry Gonzalez Convention Center, Room 006B, River Level

Tania Almeida1, Ladislau Martin-Neto2, Debora Milori1, Bruno Martins1, Alan Panosso3, Newton LaScala Júnior3 and Sergio Gaiad4, (1)Embrapa Instrumentation Center, Brazilian Agricultural Research Corporation-Embrapa, Sao Carlos, Brazil
(2)Embrapa Labex USA, Brazilian Agricultural Research Corporation- Embrapa, Beltsville, MD
(3)Faculdade de Ciências Agrárias e Veterinárias, UNESP-Jaboticabal, Jaboticabal, Brazil
(4)Embrapa Forest Center, Brazilian Agricultural Research Corporation-Embrapa, Colombo, Brazil
Main objective was evaluating effect of sewage sludge (SS) amendment in CO2 emissions in soils with different characteristics. Experimental areas were established in 2008 with eucalyptus plantation, with and without SS amendment in two different soils, one sandy and other with more clay (16-20%). Analysis of C02 emissions realized in 2011 showed that for sandy soils, with and without SS amendment, practically there were not differences, with mean value of 3.75 mmol m-2 s-1. For soils with more clay (16-20%) values of C02 emissions were different with, 5.59 mmol m-2 s-1 to area with SS amendment, in comparison to 4.13 mmol m-2 s-1 to area without SS amendment. These results of CO2 emissions were consistent with changes in soil carbon content in these different areas, mainly with a noticeable decrease in soil organic carbon in clay soil under SS amendment. Also data of laser-induced fluorescence (LIF) spectroscopy indicated increase of relative carbon compounds stability in the remaining soil organic carbon. This correlation between LIF data and CO2 emissions suggested that only more stable soil carbon compounds were not decomposed by probably increase in microorganism activity in areas under SS amendment in clay soil.
See more from this Division: S03 Soil Biology & Biochemistry
See more from this Session: Carbon, Nitrogen, and Microbial Responses to Cropping and Management Systems