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Moving to higher tiers often requires moving from default emissions factors and parameters, using more relevant values from national or regional studies. This case study presents how a regional project covering European Mediterranean countries developed information on carbon stocks and fluxes for living biomass in cropland and grasslands to improve the LULUCF monitoring in this region with specific ecological conditions.

Primary objective of MediNet

The main objective of the MediNet1 (Mediterranean Network for Reporting Emissions and Removals in the Mediterranean Region) project was to propose new default coefficients for the reporting of emissions and removals from living biomass in cropland (permanent crops) and grasslands (shrublands).

Only Portugal and Italy were formally partners to the consortium, but all Mediterranean Member States contributed. The main carbon pools in cropland and grassland are living biomass and soil carbon. The project focused on permanent crops and shrubby grasslands and for agri-forests systems or systems involving tree or shrub hedges. As there are no inventories of biomass for permanent crops and grasslands in these areas, the main objective of the project was to identify “equivalent” sources of information to improve the default factors for biomass pools in the Mediterranean area.

Impact of MediNet on emission reporting

The outputs of MediNet have been used in most inventories of the Mediterranean Member States. These new emission factors for permanent crops were also incorporated to the 2019 IPCC Refinements. Paradoxically, this international recognition of the project’s outputs has – somewhat artificially – downgraded the inventories of these Member States from Tier 2 to Tier 1 as their “country-specific” emission factors became IPCC default values.

Figure 1: Area of intervention of the MediNet project

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