Comparison of calculation methods for estimating annual carbon stock change in German forests under forest management in the German greenhouse gas inventory

Table 5 Coefficients for calculating below ground biomass

Tree species	b0	Parameter	b1	RMSE (%)	Region	Source
Spruce	0.003720	DBH (cm)	2.792465	34.6	Solling	[22]
Pine	0.006089	DBH (cm)	2.739073	26.3	Barnim	[23]
Beech	0.018256	DBH (cm)	2.321997	49.0	Solling	[22]
Oak^a	0.028000	DBH (cm)	2.440000	50.0	Northeast France	[24]
Soft hardwoods^b (root biomass)	0.000010	DBH (mm)	2.529000	9.6	South Sweden	[25]
Soft hardwoods^b (root stump biomass)	0.000116	DBH (mm)	2.290300	15.9	South Sweden	[25]

RMSE root mean square error
^a For this function, no figure for RMSE [%] is available. Therefore the IPCC default value 50 % has been used, as described in the IPCC Guidelines and Good Practice Guidance
^b The mean RMSE [%] for both functions (root stump biomass + root biomass) is 24.2 %

ISSN: 1750-0680