Augmentative Modelling: A Template for &lt;i&gt;Populus spp&lt;/i&gt;. Stand Biomass in Eurasia Region

Andreevich Usoltsev Vladimir,Petrovich Chasovskikh Viktor,Stepanovich Tsepordey Ivan,Omid Reza Shobairi Seyed

doi:10.4314/jasem.v24i5.15

Abstract

Today, estimating of biological productivity or carbon-depositing ability of forests is going on the global level, and its increase is one of the major factors of climate stabilization. In recent years, two trends in the harmonization of allometric models of tree biomass have been developing. The first of them is related to ensuring the additivity of the biomass component composition, and the second one – to the search for the so-called generic model applicable to a wide range of environmental conditions. However, all "generic" models give significant biases in their application in local conditions. In our modeling, we adhere to the principle of biomass additivity, split "generic" model into regional variants by introducing dummy variables, and build the model at the transcontinental level for the first time. When using the unique in terms of the volume of database on the level of stand of the genus Populus spp. in a number of 212 sample plots, the trans-Eurasian additive allometric models of biomass of standsfor Eurasian Populus forests are developed, and thereby the combined problem of model additivity and generality is solved. The additive model of forest biomass of Populus is harmonized in two ways: it eliminated the internal contradictions of the component and the total biomass equations, and in addition, it takes into account regional differences of forest stands not only on total, aboveground and underground biomass, but also on its component structure, i.e. it reflects the regional peculiarities of the component structure of biomass.  Keywords: genus Populus spp., biomass of forests, allometric models, sample plots, biological productivity

Highlights

In recent years, the world forest ecology is experiencing unprecedented information splash in the assessment of forest biological productivity in relation to climate change observed since 1960-80-ies (Budyko 1977)
The modern methods of modelling the biological productivity of trees and tree stands have been developed towards additivity of biomass components (Bi et al 2010, Dong et al 2015) and towards transition from "pseudo-generic" allometric models to really generic, involving regionalization of biomass model by introducing dummy variables (Fu et al 2012), that usually fulfilled on local sets of actual biomass of trees and tree stands
The first attempt to develop transcontinental harmonized allometric model of vicar species aspen and poplar forest stand biomass, which combine both mentioned by Jacobs and Cunia (1980) approaches, namely, ensuring the principle of additivity of biomass component composition and localizing of biomass additive model on regions of Eurasia by introducing dummy variables

Summary

Introduction

The world forest ecology is experiencing unprecedented information splash in the assessment of forest biological productivity in relation to climate change observed since 1960-80-ies (Budyko 1977). The first attempt to develop transcontinental harmonized allometric model of vicar species aspen and poplar (genus Populus spp.) forest stand biomass, which combine both mentioned by Jacobs and Cunia (1980) approaches, namely, ensuring the principle of additivity of biomass component composition and localizing (dismemberment) of biomass additive model on regions of Eurasia by introducing dummy variables.

Results

Conclusion