Stability of soil organic matter under long-term biosolids application |
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| Institution: | 1. UNESP – Univ. Estadual Paulista, Campus de Jaboticabal, Dep. of Soil Science, Via de Acesso Prof. Paulo Donato Castellane s/n, 14884-900, Jaboticabal, SP, Brazil;2. CTBE/CNPEM – Brazilian Bioethanol Science and Technology Laboratory/Brazilian Center for Research in Energy and Materials, Rua Giuseppe Máximo Scolfaro 10000, Polo II de Alta Tecnologia, 13083-100 Campinas, Sao Paulo, Brazil,;3. University of Florida, Range Cattle Research and Education Center, 3401 Experimental Station, Ona, FL 33865, USA;1. Sustainable Use, Management, and Reclamation of Soil and Water Research Group, Department of Agrarian Science and Technology, Universidad Politécnica de Cartagena, Paseo Alfonso XIII, 48, 30203 Cartagena, Spain;2. Department of Soil Science and Plant Nutrition, Faculty of Agriculture, Campus of Osmanbey, Harran University, 63000 Sanliurfa, Turkey;3. CEBAS-CSIC, Centro de Edafología y Biología del Segura, Consejo Superior de Investigaciones Científicas, Campus Universitario de Espinardo, Espinardo, Murcia, Spain |
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| Abstract: | Little is know on the impact of biosolids application on soil organic matter (SOM) stability, which contributes to soil C sequestration. Soil samples were collected in 2006 at plow layer from fields that received liquid and dry municipal biosolids application from 1972 to 2004 at the cumulative rate of 1416 Mg ha?1 in mined soil and 1072 Mg ha?1 in nonmined soil and control fields that received chemical fertilizer at Fulton County, western Illinois. The biosolids application increased the soil microbial biomass C (SMBC) by 5-fold in mined soil and 4-fold in nonmined soil. The biosolids-amended soils showed a high amount of basal respiration and N mineralization, but low metabolic quotient, and low rate of organic C and organic N mineralization. There was a remarkable increase in mineral-associated organic C from 6.9 g kg?1 (fertilizer control) to 26.6 g kg?1 (biosolids-amended) in mined soil and from 8.9 g kg?1 (fertilizer control) to 23.1 g kg?1 (biosolids-amended) in nonmined soil. The amorphous Fe and Al, which can improve SOM stability, were increased by 2–7 folds by the long-term biosolids application. It is evident from this study that the biosolids-modified SOM resists to decomposition more than that in the fertilizer treatment, thus long-term biosolids application could increase SOM stability. |
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