Vladimir Andreevich Usoltsev, Seyed Omid Reza Shobairi and Viktor Petrovich Chasovskikh
Abstract
For the first time using the unique database of eight species of the genera Picea spp. and of eight species of the genera Abies spp. in a number of 670 and 255 sample plots correspondingly growing on the territory of Eurasia a comparative analysis of biomass (stem, branches, foliage, roots) structure of forest stands is fulfilled. The result represents the additive allometric model, harmonized on three levels: one of which provides the principle of additively of biomass components, the second one relates to the involving dummy variables, localizing the model along to ecoregions of Eurasia, and the third one harmonizes the structure of a transcontinental model of spruce and fir stands by involving the binary variable into biomass model. It is shown that the model demonstrates differences between spruce and fir stand biomass not only for its absolute values for stem, needles, branches and roots (as is typical for trivial independent models that includes only dummy variables), but also for their ratios, i.e. the differences in the biomass structure. Negative correlation of calculated indices of spruce and fir biomass with continentality index by V. Tsenker is shown, characterizing by a correlation coefficient -0.92 to total phytomass and -0.89 for above ground ones. The model can be developed further on the third level of harmonization, on which one can include a block of dummy variables coding distribution of actual biomass data between main forest-forming wood species in Eurasia.