Authors:
V. A. USOLTSEV, doctor of agricultural sciences, professor,
M. P. VORONOV, candidate of technical sciences, associate professor,
K. V. KOLCHIN, post-graduate student,
V. A. AZARENOK, doctor of agricultural sciences, professor,
Ural State Forest Engineering University (37 Sibirskiy tract Str., 620100, Ekaterinburg)
Abstract. For the first time in Russian literature the problem of harmonizing allometric models of tree biomass components (stem, branches, foliage, roots) by means of ensuring the principle of their additivity has been solved. It is implying that the sum of biomass values obtained by component equations should be equal to the value of total biomass received with the general equation. For this purpose the unique tree biomass database in a number of 1 065 spruce trees (Picea sp.) growing on the territory of Eurasia is compiled. Additive system of biomass component relations, as a transcontinental three-step model of proportional weighting is designed. On its basis the corresponding taxation table of the biomass component composition involving two inputs – the stem diameter at breast height and the tree height – is suggested. In contrast to the “aggregation” method of designing the additive model according to the principle “from particular to general”, an alternative, “disaggregation” three-step method is applied when using another principle “from general to particular”. The authors modified the latter by removing the correlation of residual variances. The proposed model and corresponding table for estimating tree biomass makes it possible to calculate spruce stands biomass (t/ha) on Eurasian forests as the first approximation when using measuring taxation. Because such transcontinental models and tables may have biases in local conditions for their application, in the next stage of this research more detailed, regional tree biomass models and tables through “split” proposed here common model for regional ones using dummy variables will be developed.
Keywords: Picea L., biosphere role of forests, biomass of trees, allometric models, sample plots, biological productivity, equations additivity, transcontinental table of tree biomass.
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