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Carbon sequestration in European croplands
1School of Biological Sciences, University of Aberdeen, UK.
SEB Experimental Biology Series
|July 18, 2007
Summary
European croplands can significantly sequester soil carbon, offering a climate mitigation strategy under the Kyoto Protocol. However, measurement challenges and finite potential make it a riskier option than direct emission reductions.
Area of Science:
- Agricultural Science
- Environmental Science
- Climate Science
Background:
- The Marrakech Accords permit the inclusion of biospheric carbon sinks and sources in Kyoto Protocol emission reduction targets.
- Article 3.4 of the Kyoto Protocol allows forest, cropland, grazing land management, and re-vegetation activities to be included.
- European croplands are a significant, yet uncertain, source of atmospheric carbon loss, estimated at 78 Tg (C) per year for the EU.
Purpose of the Study:
- To assess the potential for European croplands to sequester soil carbon and reduce atmospheric carbon flux.
- To evaluate the feasibility of using cropland carbon sequestration to meet Kyoto Protocol emission reduction targets.
- To analyze the challenges related to measuring and verifying soil carbon changes for climate accounting.
Main Methods:
- Analysis of existing data on European cropland carbon fluxes and storage.
- Estimation of biological and achievable carbon sequestration potential in European croplands.
- Review of measurement, reporting, and verification (MRV) challenges for soil carbon changes.
Main Results:
- European croplands possess a biological potential to store 90-120 Tg (C) per year, with an achievable potential of around 20% due to constraints.
- Various management practices, including reduced tillage and organic amendments, can enhance soil carbon sequestration.
- Measuring and verifying soil carbon changes over short commitment periods (like 5 years) presents significant challenges, limiting verifiability.
Conclusions:
- European croplands offer substantial potential for carbon sequestration, but it is finite and non-permanent.
- Soil carbon sequestration is a riskier climate mitigation strategy than direct emission reduction due to measurement and permanence uncertainties.
- Despite risks, improved agricultural management for soil carbon storage offers co-benefits, making it attractive for integrated sustainability policies.
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