THE STUDY OF COMPARATIVE STRUCTURE OF Picea spp. and Abies spp. TREE BIOMASS ON THE TERRITORY OF EURASIA BY ADDITIVE AND CONVENTIONAL METHODS
V. A. Usoltsev1,2, K. V. Kolchin2, I. S. Tsepordey1, V. P. Chasovskikh2
1Botanical Garden, Russian Academy of Sciences, Ural Branch, 8 Marta str., 202а, Yekaterinburg, 620144 Russian Federation
2Ural State Forest Engineering University, Sibirskiy trakt, 37, Yekaterinburg, 620100 Russian Federation
Keywords: ель и пихта в ареале, гармонизированная по биомассе модель, регрессионные уравнения, согласованность фракционного состава, трансевразийская закономерность, spruce and fir in their natural habitat, the harmonized biomass model, regression equations, consistency of component composition, the trans-Eurasian pattern
Abstract
Forest biomass is a key ecosystem trait and an important component of the global carbon cycle. Biomass modelling is performed in terms of forest stands and sample trees. However, all current studies of this subject are carried out, firstly, within limited ecoregions and secondly, without harmonizing in relation to fractional composition of the biomass. Models harmonized in accordance with fraction composition of biomass are widespread and are referred to as additive ones. Among them, two groups of models are distinguished: one is focused on the calculation of equations separately for each fraction, followed by their modification in accord with a special algorithm so that the total result of these equations is equal to the result of the common equation. The second procedure of equation harmonizing applies the opposite algorithm, according to which the common equation is calculated, which is divided into partial ones according to a special scheme, and their total is equal to the final result of the common equation. The database on biomass of 1035 spruce and fir trees growing in their Eurasian habitats developed by the author, is used as a basis for revealing differences between equal-sized trees of two genera in the structure of biomass, while ensuring the principle of consistency in the second of these options. A harmonized model allowing to compare the biomass structure of trees of two genera in terms of a continental approach is proposed for the first time. It has been revealed that total, aboveground and underground biomass of fir trees exceeds that of spruce by13, 11 and 20 % respectively. However, there are some differences between Abies and Picea genera in the ratio of aboveground and underground biomass in the total biomass and in the ratio of the crown and stem biomass in the aboveground biomass, while any differences between two genera are not in the ratio of needles and branches in the crown biomass and in the ratio of wood and bark in the total stem biomass. The proposed model of additive biomass structure makes it possible to calculate spruce and fir stand biomass in Eurasian forests when using ground forest survey data.
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