Carbon mineralization in an arid soil amended with thermally-dried and composted sewage sludges |
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| Institution: | 1. College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, People’s Republic of China;2. Department of Life and Environmental Science, Hangzhou Normal University, Hangzhou 310036, People’s Republic of China;3. State Key Laboratory of Plant Physiology and Biochemistry, Zhejiang University, Hangzhou 310058, People’s Republic of China;1. Research Group of Soil Fertility and Nutrient Management, Department of Soil Management, Ghent University, Coupure Links 653, 9000 Gent, Belgium;2. Centre for Ecology and Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, LA1 4AP, UK;3. Department of Agricultural and Environmental Sciences, University of Udine, Via delle Scienze 206, 33100 Udine, Italy;1. College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, Hunan, 410128, PR China;2. Key Laboratory for Rural Ecosystem Health in Dongting Lake Area of Hunan Province, Changsha, 410128, PR China;3. Hunan Engineering Laboratory for Pollution Control and Waste Utilization in Swine Production, Changsha, 410128, PR China;1. Department of Soil and Crop Sciences, 307 University Avenue, Colorado State University, Fort Collins, CO 80523, USA;2. Natural Resource Ecology Laboratory, 1232 East Drive, Colorado State University, Fort Collins, CO 80523, USA;3. College of Life Sciences, Brigham Young University, Provo, UT 84602, USA;4. Department of Ecosystem Science and Sustainability, Colorado State University, Fort Collins, CO 80523, USA;1. UMR 7618 BIOEMCO, UMR CNRS-Université Paris VI et XII-IRD AgroParisTech, Paris et Thiverval-Grignon, France;2. Institute of Environmental Technology, VAST, Hanoi, Viet Nam;3. Institute of Chemistry, VAST, Hanoi, Viet Nam;4. BIOREN-UFRO, Universidad de La Frontera, Temuco, Chile;5. IRD, UMR 211 BIEMCO, UMR CNRS-Université Paris VI et XII-IRD AgroParisTech, Centre IRD Ile de France, Bondy, France |
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| Abstract: | Soil amendment with sewage sludge (SS) from municipal wastewater treatment plants is nowadays a common practice for both increasing soil organic matter and nutrient contents and waste disposal. However, the application of organic amendments that are not sufficiently mature and stable may adversely affect soil properties. Composting and thermal drying are treatments designed to minimize these possible deleterious effects and to facilitate the use of SS as a soil organic amendment. In this work, an arid soil either unamended or amended with composted sewage sludge (CSS) or thermally-dried sewage sludge (TSS) was moistened to an equivalent of 60% soil water holding capacity and incubated for 60 days at 28 °C. The C–CO2 emission from the samples was periodically measured in order to study C mineralization kinetics and evaluate the use of these SS as organic amendments. In all cases, C mineralization decreased after the first day. TSS-amended soil showed significantly higher mineralization rates than unamended and CSS-amended soils during the incubation period. The data of cumulative C–CO2 released from unamended and SS-amended soils were fitted to six different kinetic models. A two simultaneous reactions model, which considers two organic pools with different degree of biodegradability, was found to be the most appropriate to describe C mineralization kinetics for all the soils. The parameters derived from this model suggested a larger presence of easily biodegradable compounds in TSS-amended soil than in CSS-amended soil, which in turn presented a C mineralization pattern very similar to that of the unamended soil. Furthermore, net mineralization coefficient and complementary mineralization coefficient were calculated from C mineralization data. The largest losses of C were measured for TSS-amended soil probably due to an extended microbial activity. The results obtained thus indicated that CSS is more efficient for increasing total organic C in arid soils. |
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