Allometric models and tables for estimating the biomass of dead branches of growing trees by remote sensing
https://doi.org/10.53374/1993-0135-2023-1-56-64
Abstract
In a changing climate, the relevance of assessing the full carbon budget of forest ecosystems and the carbon pool of all their components, including dead branches of growing trees, has increased. In the published data on the biomass of trees, the proportion of dead branches in the aboveground biomass varies from 1 to 22 %, but attempts to identify factors explaining such a wide range of it are quite rare. In this study, the first attempt was made to develop allometric models designed to estimate the mass of dead branches (MDB) of growing pine trees by the measured crown diameter and height of trees of natural stands and plantations in the conditions of the steppe zone. The basis of the study was 357 model trees obtained on 40 sample plots. The allometric model of the MDB, which includes such independent variables as crown diameter, tree height and the origin of the stand, explains 84 % of the variability of the MDB at the level of p < 0.001. The value of the MDB in large trees can reach 15–20 kg, while in plantations this value is twice as high as in natural stands. In percentage terms, the value of MDB in relation to aboveground biomass increases with increasing tree size in natural stands from 2 to 6 % and in plantations from 3.5 to 11 %, and on average for natural stands and plantations is 5–6 %. The contributions of crown diameter, tree height and the origin of the stand to explain the variability of the MDB were 19, 62 and 19 %, respectively. When aboveground biomass was included in the MDB model as an additional independent variable, the contributions of crown diameter, tree height, aboveground biomass and the origin of the stand to explain the variability of the MDB were 18, 33, 17 and 32 %, respectively. The proposed allometric models can be used in estimating the MDB of Scots pine based on аirborne or terrestrial laser sensing. When calculating carbon pools in Scots pine forests of the steppe zone, it is necessary to make an amendment to the pool estimate in the form of a 5–6 % increase by the value of the MDB.
About the Authors
V. A. Usoltsev
Ural State Forest Engineering University ; Botanical Garden of the Ural Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
37, Siberian tract, Yekaterinburg, 620100
202a, 8 Marta Str., Yekaterinburg, 620144
I. S. Tsepordey
Botanical Garden of the Ural Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
202a, 8 Marta Str., Yekaterinburg, 620144
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Review
For citations:
Usoltsev V.A., Tsepordey I.S. Allometric models and tables for estimating the biomass of dead branches of growing trees by remote sensing. Conifers of the boreal area. 2023;41(1):56-64. (In Russ.) https://doi.org/10.53374/1993-0135-2023-1-56-64
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