TAILIEUCHUNG - Long - term impact of biogas production on soil organic carbon storage

The results demonstrated that BGRs did not affect SOC negatively over a period of ten years. The simulation predicted similar effect of BGRs and cattle slurry on SOC. The analysis of the cropping system showed that the changes in cropping system had greater impact on SOC than fertilization. | Journal of Agriculture and Environmental Sciences December 2018 Vol. 7 No. 2 pp. 12-22 ISSN 2334-2404 Print 2334-2412 Online Copyright The Author s . All Rights Reserved. Published by American Research Institute for Policy Development DOI URL https Long-Term Impact of Biogas Production on Soil Organic Carbon Storage Nadia Prays1 Uwe Franko2 Abstract Biogas residue BGR is a by-product of a biogas production which is used as organic fertilizer in agriculture. We hypothesized that replacing undigested organic fertilizers with BGR leads to a decrease in soil organic carbon SOC due to 1 carbon off take during the anaerobic digestion process and 2 the change in cropping system after biogas production is implemented. Nine fields that were amended with BG Rs were selected to study carbon fluxes using the CANDY CArbon and Nitrogen Dynamics model. Two scenarios were analyzed. First a simulation from 1973 to 2050 with a repeat of the cropping system and a crop rotation were used to evaluate the impact of BGR on soil. In the second scenario the BGR application was replaced with undigested cattle slurry using the same amount of N kgNha-1 . Additionally the cropping system from 1973 to 2016 was analyzed to highlight the most important drivers of SOC accumulation. The results demonstrated that BGRs did not affect SOC negatively over a period of ten years. The simulation predicted similar effect of BGRs and cattle slurry on SOC. The analysis of the cropping system showed that the changes in cropping system had greater impact on SOC than fertilization. Keywords bioenergy carbon sequestration modeling farm scale fertilization biogas residues 1. Introduction Biogas is an important renewable energy resource that decreases CO2 emissions and can substitute fossil fuels. In 2016 most of the approximately 8 000 operating German biogas plants were part of agricultural farms. These farms use cattle slurry and energy crops to convert biomass

• Luật học
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• Long term impact of biogas production
• Soil organic carbon storage
• Long term impact
• Cattle slurry on SOC
• Greater impact on SOC
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