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Carbon footprints and social carbon cost assessments in a perennial energy crop system: A comparison of fertilizer management practices in a Mediterranean area

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  • Solinas, Stefania
  • Tiloca, Maria Teresa
  • Deligios, Paola A.
  • Cossu, Marco
  • Ledda, Luigi

Abstract

Agriculture is strongly linked to climate change and has a two-sided relationship with climate change. Although climate change contributes to reducing agricultural productivity, the primary sector is responsible for the production of greenhouse gas (GHG) emissions; on the other hand, the primary sector could mitigate emissions to foster soil carbon sequestration. Specifically, perennial energy crop systems could produce relevant environmental and socio-economic benefits. This study aimed to highlight the potential efficacy of various fertilizer management strategies in reducing GHG emissions and increasing the social value obtained from carbon storage. Using two methodological approaches, namely, the carbon footprint (CF) and social carbon cost (SCC) methods, five nitrogen fertilization patterns (low input, LI; high input, HI; LI + biochar, LI + Bi; LI + cover crop, LI + CC; and LI + Bi + CC) were compared in an experiment on cardoon cultivation for three consecutive growing seasons. GHG release exceeded GHG removal and ranged from 0.20 (HI) to 0.14 (LI + CC) t CO2e per production unit. LI + CC reduced GHG emissions and optimized yield. The rates of carbon sequestration ranged from 72.7 (HI) to 26.2 (LI) t CO2e t −1 of biomass. Furthermore, the combined use of biochar and a cover crop had no positive effects on C sequestration or GHG emission reduction, unlike these treatments individually. In fact, LI + Bi provided the highest value for C storage (61.1 t CO2e t − 1 of biomass), and LI + CC had the best GHG balance (0.14 t CO2e per production unit). The monetary evaluation of C storage showed that HI would produce the greatest benefits until 2050 (i.e., 9 K US dollars per t CO2e). Although a single best option was not identified among the fertilizer management practices, identifying the optimal trade-offs among productivity, GHG emissions reduction and SCC value is important in ensuring that an energy crop will provide food security as well as environmental and socio-economic sustainability. Furthermore, a potential optimal solution could allow improvements in long-term crop system planning and land use and the development of effective strategies to combat climate change.

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  • Solinas, Stefania & Tiloca, Maria Teresa & Deligios, Paola A. & Cossu, Marco & Ledda, Luigi, 2021. "Carbon footprints and social carbon cost assessments in a perennial energy crop system: A comparison of fertilizer management practices in a Mediterranean area," Agricultural Systems, Elsevier, vol. 186(C).
    • Handle: RePEc:eee:agisys:v:186:y:2021:i:c:s0308521x20308507
    DOI: 10.1016/j.agsy.2020.102989
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    References listed on IDEAS

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    2. L. X. Xiong & X. Y. Li & J. J. Ning & Y. R. Dong & Y. Yan, 2023. "The effects of dynamic incentives on the recycling of livestock and poultry manure in a multiscenario evolutionary game," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 25(5), pages 4301-4333, May.

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