The ratio of crown diameter to stem diameter: generic models of forest-forming species of Eurasia
https://doi.org/10.53374/1993-0135-2024-1-36-42
Abstract
The crowns of trees were subjected to much less quantitative study than their stems, primarily because of their lower use value. However, the size of the crown, closely related to the photosynthetic ability of the tree, is an important parameter in the study of tree growth. In closed and thickened stands, measuring the diameter of the crown is less accurate and much more labor-consuming compared to other indicators. Therefore, the availability of allometric models for estimating the diameter of crowns reduces costs when obtaining new initial data. In literature, the ratio of crown diameter to stem diameter at breast height (relative crown diameter) was used to predict the size of the tree growth area and to develop thinning regimes, to predict the stand density at a given average stem diameter and to estimate the stem diameter by crown diameter measured using remote sensing methods. The purpose of our study is to calculate the generic allometric dependences of the relative diameter of the crown on the diameter of the tree stem for the main forest-forming species and genera of Eurasia. According to the actual measurement data of 5,497 model trees of 23 forest-forming species and genera (subgenera) of Eurasia, allometric models of the relationship between the relative diameter of the crown and the stem diameter at breast height were compiled for the first time. According to the ranking performed, species and genera are distributed according to the relative diameter of the crown in the following descending order: Juglans, Phellodendron, Maackia, Acer, Ulmus, Chosenia, Salix, Quercus, Carpinus, Tilia, Fraxinus, Robinia, Populus, Larix, Fagus, Betula, Haploxylon, Chamaecyparis, Abies, Picea, Alnus, Pinus, Cryptomeria. Models at the level of genera can be applied to those species for which data are not yet available within the genus.
Supporting agencies: The publication was prepared based on the results of the research carried out within the framework of the state task of the Botanical Garden, Ural Branch of RAS.
About the Authors
V. A. Usoltsev
Ural State Forest Engineering University; Botanical Garden, Ural Branch of RAS
Russian Federation
Russian Federation
37, Sibirskiy Trakt, Yekaterinburg, 620100
202а, 8 Marta Str., Yekaterinburg, 620144
N. I. Plyukha
Ural State Forest Engineering University
Russian Federation
Russian Federation
37, Sibirskiy Trakt, Yekaterinburg, 620100
I. S. Tsepordey
Botanical Garden, Ural Branch of RAS
Russian Federation
Russian Federation
202а, 8 Marta Str., Yekaterinburg, 620144
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For citations:
Usoltsev V.A., Plyukha N.I., Tsepordey I.S. The ratio of crown diameter to stem diameter: generic models of forest-forming species of Eurasia. Conifers of the boreal area. 2024;42(1):36-42. (In Russ.) https://doi.org/10.53374/1993-0135-2024-1-36-42
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