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Monitoring soil carbon in smallholder carbon projects: insights from Kenya

Author

Listed:
  • Adaugo O. Okoli

    (Hans-Ruthenberg-Institute of Agricultural Science in the Tropics, University of Hohenheim)

  • Athena Birkenberg

    (Hans-Ruthenberg-Institute of Agricultural Science in the Tropics, University of Hohenheim)

Abstract

Voluntary carbon market schemes facilitate funding for projects promoting sustainable land management practices to sequester carbon in natural sinks such as biomass and soil, while also supporting agricultural production. The effectiveness of VCM schemes relies on accurate measurement mechanisms that can directly attribute carbon accumulation to project activities. However, measuring carbon sequestration in soils has proven to be difficult and costly, especially in fragmented smallholdings predominant in global agriculture. The cost and accuracy limitations of current methods to monitor soil organic carbon (SOC) limit the participation of smallholder farmers in global carbon markets, where they could potentially be compensated for adopting sustainable farming practices that provide ecosystem benefits. This study evaluates nine different approaches for SOC accounting in smallholder agricultural projects. The approaches involve the use of proximal and remote sensing, along with process models. Our evaluation centres on stakeholder requirements for the Measurement, Reporting, and Verification system, using the criteria of accuracy, level of standardisation, costs, adoptability, and the advancement of community benefits. By analysing these criteria, we highlight opportunities and challenges associated with each approach, presenting suggestions to enhance their applicability for smallholder SOC accounting. The contextual foundation of the research is a case study on the Western Kenya Soil Carbon Project. Remote sensing shows promise in reducing costs for direct and modelling-based carbon measurement. While it is already being used in certain carbon market applications, transparency is vital for broader integration. This demands collaborative work and investment in infrastructure like spectral libraries and user-friendly tools. Balancing community benefits against the detached nature of remote techniques is essential. Enhancing information access aids farmers, boosting income through improved soil and crop productivity, even with remote monitoring. Handheld sensors can involve smallholders, given consistent protocols. Engaging the community in monitoring can cut project costs, enhance agricultural capabilities, and generate extra income.

Suggested Citation

  • Adaugo O. Okoli & Athena Birkenberg, 2024. "Monitoring soil carbon in smallholder carbon projects: insights from Kenya," Climatic Change, Springer, vol. 177(9), pages 1-28, September.
    • Handle: RePEc:spr:climat:v:177:y:2024:i:9:d:10.1007_s10584-024-03796-1
    DOI: 10.1007/s10584-024-03796-1
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    References listed on IDEAS

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    1. World Bank, 2021. "Soil Organic Carbon MRV Sourcebook for Agricultural Landscapes," World Bank Publications - Reports 35923, The World Bank Group.
    2. Theodora Angelopoulou & Athanasios Balafoutis & George Zalidis & Dionysis Bochtis, 2020. "From Laboratory to Proximal Sensing Spectroscopy for Soil Organic Carbon Estimation—A Review," Sustainability, MDPI, vol. 12(2), pages 1-24, January.
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