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Effects of municipal solid waste compost and sewage sludge on mineralization of soil organic matter |
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| Authors: | Filipe Pedra Alfredo Polo Herminia Domingues |
| Institution: | a Laboratorio Quimico Agricola Rebelo da Silva, Apartado 3226,1301-903 Lisboa, Portugal b CSIC,Centro de Ciencias Medioambientales, Serrano, 115 dpdo, 28006 Madrid, Spain c DCEA, Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal d Estacao Agronomica Nacional, Avenida da Republica, Departamento de Solos, 2784-505 Nova Oeiras, Portugal |
| Abstract: | This work sets out to verify whether the application of municipal solid waste compost (MSWC) or treated urban sewage sludge (USS) organic amendments efficiently promote organic matter (OM) increases in a Haplic Podzol (PZha) and in a Calcic Vertisol (VRcc). For that purpose, carbon (C) mineralization and C kinetic parameters were studied, using a laboratory experimental incubation setup. The results showed that the addition of the amendments to the soils increased their mineralization capacities, and that the highest C mineralization rate was reached at the end of the first 2 d of incubation. The different characteristics of the soils seem to have influenced the C mineralization rates during the 28-d incubation. The USS induced higher C mineralization than the MSWC, and the PZha soil gave rise to higher C mineralization than VRcc. For all treatments, C mineralization adjusted well to an exponential plus linear kinetic model, suggesting that the organic C of the amendments was made up of two organic pools of differing degrees of stability. With the exception of the application of USS 60 t ha−1, all the treatments increased the OM content on both soils, or at least the OM remained constant throughout the incubation. |
| Keywords: | Organic amendments Soil Kinetics Carbon mineralization |
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