Agrarian
Bulletin
of the Urals

Russian Journal of Agricultural Research

The publication is registered by the Ministry of the Russian Federation
for Affairs of the Press, Television and Radio Broadcasting and Mass Communication Media.
Registration certificate: PI number 77-12831 on May 31, 2002
Subscription index in catalog «Russian Press» - 16356
ISSN 1997 - 4868 (Print)

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Journal is included in the list of VAK (from 25.09.2017), No. 291

ISSN 2307-0005 (Online)
Key title: Agrarnyj vestnik Urala (Online)
Abbreviated key title: Agrar. vestn. Urala (Online)

Аграрный вестник Урала № 06 (160) 2017

Биология и биотехнологии

Азаренок В. А. доктор сельскохозяйственных наук, профессор Уральский государственный лесотехнический университет

Усольцев В. А. доктор сельскохозяйственных наук, профессор, Уральский государственный лесотехнический университет

Колчин К. В. аспирант Уральский государственный лесотехнический университет

УДК:581.5

ON POSSIBILITIES FOR APPLICATION OF GENERIC AND REGIONAL ALLOMETRIC MODELS WHEN ESTIMATING SPRUCE TREE BIOMASS

 Forests play animportant role in reducing the amount of greenhouse gases in the atmosphere andpreventing climate change. One way to quantify сarbon exchange in forest coveris estimating changes in its biomass and carbon pools over time. Biomassestimating on the unit of area starts with harvesting sample trees and weighingtheir biomass. It is known the strong and sustainable relationship between treebiomass and its diameter (simple allometry), or between tree biomass and anumber of mass-forming (morphometric) indices (multi-factor allometry). Atpresent, in different countries and continents, the studies of theapplicability of the so-called generic (generalized, common) allometric modelsare intensified that would give acceptable accuracy in estimating forest biomass.In the article on the basis of the compiled database of tree biomass of Picea at a number of 1065 trees,allometric models of the four modifications are designed, which include theblock of independent dummy variables. These models provide an opportunity togive regional estimates of tree biomass when using some known mass-formingindices (stem and crown diameter and tree height). Allometric models proposedare indicative of their adequacy for the actual data (coefficients ofdetermination are 0.814 to 0.984) and can be applied in regional estimating ofspruce tree biomass. However, generic allometric models built using the totalquantity of actual data give in different ecoregions too large standard errors(up to 221 %) and unacceptable both positive and negative biases (from +311 to-99 %), that excludes any possibility of their application at regional levels.


Keywords:

Picea L., allometric models, tree biomass, sample plots, regional differences, standard errors, biases.


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