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Accounting for long-term soil fertility effects when assessing the climate impact of crop cultivation

Author

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  • Henryson, Kajsa
  • Sundberg, Cecilia
  • Kätterer, Thomas
  • Hansson, Per-Anders

Abstract

Soil organic carbon (SOC) dynamics influence the climate impact of crop cultivation, both through affecting net carbon exchange between the soil and the atmosphere and through affecting soil fertility. Higher soil fertility can enhance yield, and consequently make more plant residues available for carbon sequestration in the soil. This feedback mechanism between SOC and yield is commonly not included when assessing the environmental impact of crop production using system analysis tools like life cycle assessment (LCA). Therefore, this study developed a modelling framework where the SOC-yield feedback mechanism is included in climate impact assessment of crop cultivation, and which could be applied in LCAs. The framework was constructed by combining a model for SOC dynamics, yield response to SOC changes in a Swedish long-term field experiment and climate impact assessment. The framework employs a dynamic approach, with a time-distributed emissions inventory and a time-dependent climate impact assessment model, complemented by the most common climate metric, global warming potential (GWP). A case study applying the framework to barley cultivation was performed to explore the quantitative effect of including the feedback mechanism on the calculated climate impact. The case study involved simulating a fertiliser-induced 10% yield increase during one year and assessing the climate impact over 60 years. In this specific case, the effect of solely including SOC dynamics without the yield response to SOC decreased climate impact per kg barley by about three-fold more than only accounting for the 10% temporary yield increase. When the feedback mechanism was included, the estimated climate impact decreased five-fold more than when SOC changes were not included. These results show that SOC changes can affect the climate impact of cultivation, not only through affecting net CO2 exchanges between soil and atmosphere, as previously acknowledged by other studies, but also through changing the system performance. The quantitative results obtained in this study show that this could be an important aspect to include in order to avoid introducing systematic error when assessing the long-term climate impact of crop management changes that affect yield or SOC dynamics.

Suggested Citation

  • Henryson, Kajsa & Sundberg, Cecilia & Kätterer, Thomas & Hansson, Per-Anders, 2018. "Accounting for long-term soil fertility effects when assessing the climate impact of crop cultivation," Agricultural Systems, Elsevier, vol. 164(C), pages 185-192.
    • Handle: RePEc:eee:agisys:v:164:y:2018:i:c:p:185-192
    DOI: 10.1016/j.agsy.2018.03.001
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    References listed on IDEAS

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    1. Karlsson, Hanna & Ahlgren, Serina & Strid, Ingrid & Hansson, Per-Anders, 2015. "Faba beans for biorefinery feedstock or feed? Greenhouse gas and energy balances of different applications," Agricultural Systems, Elsevier, vol. 141(C), pages 138-148.
    2. Wang, Yuhui & Zhou, Guangsheng & Jia, Bingrui, 2008. "Modeling SOC and NPP responses of meadow steppe to different grazing intensities in Northeast China," Ecological Modelling, Elsevier, vol. 217(1), pages 72-78.
    3. Harald Dyckhoff & Tarek Kasah, 2014. "Time Horizon and Dominance in Dynamic Life Cycle Assessment," Journal of Industrial Ecology, Yale University, vol. 18(6), pages 799-808, December.
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    1. Martin A. Bolinder & Felicity Crotty & Annemie Elsen & Magdalena Frac & Tamás Kismányoky & Jerzy Lipiec & Mia Tits & Zoltán Tóth & Thomas Kätterer, 2020. "The effect of crop residues, cover crops, manures and nitrogen fertilization on soil organic carbon changes in agroecosystems: a synthesis of reviews," Mitigation and Adaptation Strategies for Global Change, Springer, vol. 25(6), pages 929-952, August.
    2. Raphael Butler Jumbo & Frédéric Coulon & Tamazon Cowley & Ikeabiama Azuazu & Emmanuel Atai & Imma Bortone & Ying Jiang, 2022. "Evaluating Different Soil Amendments as Bioremediation Strategy for Wetland Soil Contaminated by Crude Oil," Sustainability, MDPI, vol. 14(24), pages 1-22, December.

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