Effect of Carbon Sequestration in Agricultural Production in Kabba/Bunu LGA of Kogi State, Nigeria

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🔬研究者:Offers a reproducible climate-adjusted SOC accounting methodology for tropical savannah systems.

🏢実務担当者:Demonstrates measurable sequestration rates for agroforestry and biochar that can support carbon credit project design.

🏛政策担当者:Highlights the potential of carbon-smart agriculture for NDCs and national climate action plans in developing countries.

Soil degradation and climate variability are weakening crop productivity in Nigeria’s derived savannah, while agriculture remains a major source of emissions. Carbon-smart practices can simultaneously restore soils and mitigate emissions, but their performance is climate-sensitive and requires climate-adjusted accounting. This study quantified climate-adjusted carbon sequestration potential and agronomic co-benefits of key farm practices in Kabba/Bunu LGA, using a 2004–2024 climate evidence framework and baseline SOC stocks measured across georeferenced farm clusters. A Kabba/Bunu climate extraction box (7.77–7.87° N, 6.02–6.12° E) was analysed using a reproducible workflow for CHIRPS rainfall and ERA5-Land temperature (2004–2024). Annual totals/means were derived, and SPI‑12 was computed to classify drought/normal/wet years. Baseline SOC stocks (0–30 cm) were measured across six farm clusters and three management systems (conventional tillage, reduced tillage, and agroforestry) using dry combustion and bulk density core methods. Practice-based sequestration over 400 ha and five years was estimated and converted to CO₂ equivalents using 3.67, then adjusted with a climate stress coefficient (SEC=0.96). Climate diagnostics indicate a warming trend (~0.03°C yr⁻¹) and strong rainfall variability (≈966–1,614 mm yr⁻¹), with recurrent drought years (e.g., 2015, 2017, 2018, 2023) and wet years (e.g., 2007, 2024). Baseline SOC stocks ranged ~39–55 t C ha⁻¹, with agroforestry > reduced tillage > conventional tillage. Climate-adjusted sequestration reached 931.2 t C (3,417.2 tCO₂eq) over five years across 400 ha; agroforestry (1,126.8 tCO₂eq) and biochar (793.0 tCO₂eq) contributed 56% of the total. Results demonstrate that carbon-smart agriculture can produce measurable mitigation while improving soil function, moisture retention and yield stability under climate stress. Scaling agroforestry, biochar and reduced tillage through extension support and incentives can accelerate SDG 2 (food security), SDG 13 (climate action) and SDG 15 (land restoration). Further research should implement continuous monitoring and model-based MRV to strengthen carbon finance readiness.

• openalex https://doi.org/10.5281/zenodo.19874518first seen 2026-05-17 04:55:21 · last seen 2026-05-29 05:19:48