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Results of the combined two-phase multi source inventory of carbon stock and carbon stock changes in four test areas across Europe

The statistical analysis of the carbon stock estimates were applied in the four test sites Catalonia in Spain, Salzburg in Austria, Thuringia in Germany and Hyytiala in Finland. Individual single tree data were available through bilateral contracts between the data providers in the countries and the University of Hamburg. Soil information was provided by partner 9 (University Genth) but could not be merged and up scaled together with the tree information due to different sampling locations. Biomass expansion procedures were provided by partner 5 (METLA). In most of the cases the carbon stocks estimated with BEFs are smaller than the carbon stock estimates obtained by biomass functions. Only in some age classes the BEF based estimates exceeded those obtained by functions. The average carbon stock per hectare is about 108 t/ha in the Finnish, 151t/ha in the Spanish, 210t/ha in the German, and 248t/ha in the Austria test site. The applied combined 2 phases EO/ in situ carbon stock inventory concept proved to be superior to inventory concepts that utilize only in-situ (terrestrial) data. The combined approach consistently resulted in smaller sampling errors and thus more reliable carbon stock estimates.

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