Аграрный вестник Урала № 07 (161) 2017Биология и биотехнологии
TRANSCONTINENTAL ADDITIVE ALLOMETRIC MODEL AND WEIGHT TABLE FOR ESTIMATING SPRUCE TREE BIOMASS
For the first time in Russian literature the problem of harmonizing allometricmodels of tree biomass components (stem, branches, foliage, roots) by means ofensuring the principle of their additivity has been solved. It is implying thatthe sum of biomass values obtained by component equations should be equal tothe value of total biomass received with the general equation. For this purposethe unique tree biomass database in a number of 1 065 spruce trees (Picea sp.) growingon the territory of Eurasia is compiled. Additive system of biomass component relations,as a transcontinental three-step model of proportional weighting is designed. Onits basis the corresponding taxation table of the biomass component compositioninvolving 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 particularto general”, an alternative, “disaggregation” three-step method is applied whenusing another principle “from general to particular”. The authors modified thelatter by removing the correlation of residual variances. The proposed modeland corresponding table for estimating tree biomass makes it possible to calculatespruce stands biomass (t/ha) on Eurasian forests as the first approximationwhen using measuring taxation. Because such transcontinental models and tablesmay have biases in local conditions for their application, in the next stage ofthis research more detailed, regional tree biomass models and tables through“split” proposed here common model for regional ones using dummy variables willbe developed.
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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