Modeling of the Statistical Distribution of Tracheids in Conifer Rings: Finding Universal Criterion for Earlywood–Latewood Distinction

The quantitative description of growth rings is yet incomplete, including the functional division into earlywood and latewood. Methods developed to date, such as the Mork criterion for conifers, can be biased and arbitrary depending on species and growth conditions. We proposed the use of modeling o...

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Bibliographic Details
Published in:Plants (Basel) 2023-09, Vol.12 (19), p.3454
Main Authors: Belokopytova, Liliana V, Zhirnova, Dina F, Yang, Bao, Babushkina, Elena A, Vaganov, Eugene A
Format: Article
Language:English
Subjects:
Analysis
cell wall thickness
Cell walls
Chi-square test
Communication
Coniferous trees
Conifers
Criteria
Diameters
Distribution
earlywood
Growth conditions
Growth rings
latewood
Mathematical models
Modelling
Mork criterion
Mountains
Normal distribution
Pine trees
Plant cells and tissues
Probability distribution
quantitative woodanatomy
Ring structures
Skewness
Statistical analysis
Statistical distributions
transition wood
Wood
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Summary:The quantitative description of growth rings is yet incomplete, including the functional division into earlywood and latewood. Methods developed to date, such as the Mork criterion for conifers, can be biased and arbitrary depending on species and growth conditions. We proposed the use of modeling of the statistical distribution of tracheids to determine a universal criterion applicable to all conifer species. Thisstudy was based on 50-year anatomical measurements of Pinus sylvestris L., Pinus sibirica Du Tour, and Picea obovata Ledeb. near the upper tree line in the Western Sayan Mountains (South Siberia). Statistical distributions of the cell wall thickness (CWT)-to-radial-diameter (D) ratio and its slope were investigated for raw and standardized data (divided by the mean). The bimodal distribution of the slope for standardized CWT and D was modeled with beta distributions for earlywood and latewood tracheids and a generalized normal distribution for transition wood to account for the gradual shift in cell traits. The modelcan describe with high accuracy the growth ring structure for species characterized by various proportions of latewood, histometric traits, and gradual or abrupt transition. The proportion of two (or three, including transition wood) zones in the modeled distribution is proposed as a desired criterion.
ISSN:2223-7747
2223-7747
DOI:10.3390/plants12193454