# Commission Decision of 10 June 2010 on guidelines for the calculation of land carbon stocks for the purpose of Annex V to Directive 2009/28/EC (notified under document C(2010) 3751) (2010/335/EU), Division 5.1.2: Below ground living biomass

Extent: E+W+S+N.I.

For the calculation of CBGB one of the following two rules shall be used:
(1) CBGB = BBGB × CFB
where:
CBGB below ground carbon stock in living biomass (measured as mass of carbon per hectare);
BBGB weight of below ground living biomass (measured as mass of dry matter per hectare);
CFB carbon fraction of dry matter in living biomass (measured as mass of carbon per mass of dry matter).
For cropland, perennial crops and forest plantations the value for BBGB shall be the average weight of the below ground living biomass during the production cycle.
For CFB the value of 0,47 may be used.
(2) CBGB = CAGB × R
where:
CBGB below ground carbon stock in living biomass (measured as mass of carbon per hectare);
CAGB above ground carbon stock in living biomass (measured as mass of carbon per hectare);
R ratio of below ground carbon stock in living biomass to above ground carbon stock in living biomass.
Appropriate values for R set out in point 8 may be used.

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Source: https://www.legislation.gov.uk/eudn/2010/335/annex/division/5/division/5.1/division/5.1.2 (the official version)
Page: https://openlegislation.uk/eu-decision-2010-335/annex/division-5/division-5.1/division-5.1.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.