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Significant offset of long-term potential soil
carbon sequestration by nitrous oxide
emissions in the EU
Emanuele Lugato,
A. Jones, A. Leip, L. Montanarella
FAO-Rome
21-23 March, 2017
Soil Organic Carbon and EU policies
• Agriculture: Common Agricultural Policy (CAP) - Good
Agricultural and Environmental Condition – GAEC
• Climate: CO2 emission and removal should be accounted for the
cropland and grazing land management under the LULUCF
framework (Council and Parliament Decision on LULUCF (529/2013))
UNFCC COP PARIS
C sequestration
N2O flux(GWP 298 time higher than CO2)
Ground-based data model integration
Soil component
20’000 topsoil samples
main physico-chemical soil
properties
2009 completed
2015 to be analyzed
2018 forecasted
Land Use and Coverage Area
frame Survey
Methodology
Mitigating practice options starting in 2016, in comparison with a baseline of current agricultural practices:
• Integrated crop residue retention and lower soil disturbance management (IRS)
• Introduction of N fixing cover crops incorporated before thesuccessive main crop (CC), generally refereed as ‘greenmanure’
Reduction of the mineral N fertilization by 75% of N fixed
Scenario analysis
IRS CC
Results
sink
source
CO2
Net GHG
N2O
Net GHG fluxes by 2040
IRS
CC
2095-21002035-2040
Crop response
IRS
CC
Baseline – EUROSTATyields comparison
IRS and CCvs Baseline
Crop response
CC vs Baseline
Tonitto at al., 2006
legum
e N
input ra
te
Conclusions
• Sequestration ≠ mitigation
• Need to consider the coupled C and N cycles for the assessment of any mitigating strategy
• Improve the management effects on biogeochemical cycles in ESM
• More long-term integrated monitoring systems
Systematic review
Swedish Foundation for
Strategic Environmental
Research (Mistra)
http://www.eviem.se/en/projects/Soil-
organic-carbon-stocks/
