Distribution of juvenile wood in two stems of Larixlaricina

Abstract

The distribution and vertical variation of juvenile wood was studied in an 81-year-old dominant tree and an 83-year-old suppressed tree of Larixlaricina (Du Roi) K. Koch. Two criteria, growth ring width and tracheid length, were used to demarcate the boundary of juvenile wood. The width of juvenile wood, expressed in centimetres and the number of growth rings, decreased noticeably from the base to the top of the tree. The volume of juvenile wood decreased in a similar pattern. These decreasing trends had a strong negative correlation with the year of formation of cambial initials at a given tree level. The length of these cambial initials decreased with increasing age of formation of the cambial initials. In the juvenile wood zone, there was a positive linear regression between the growth ring number (age) and the tracheid length. The slopes of these regression lines at various tree levels increased as the age of the year of formation of the cambial initials increased. At a given tree level, the length of tracheids increased from the pith to a more uniform length near the bark. However, the number of years needed to attain a more uniform tracheid length decreased from the base to the top of the tree. These relationships suggest that the formation of juvenile wood is related to the year of formation of the cambial initials. Consequently, the juvenile wood is conical in shape, tapering towards the tree top.

Comparison of the Structure of Juvenile and Mature Wood of Larix decidua Mill. from Fast-Growing Plantations in Poland

“…Based on the literature (Yang et al 1986;Helińska-Raczkowska and Fabisiak 1999;Nawrot et al 2014), the boundary between juvenile and mature wood was determined using the criterion of the width of annuals rings and latewood proportion in annual rings. Furthermore, based on previous studies (Yang et al 1986;Bao et al 2001), the differences in anatomical structure, especially the differences in structural elements' size, tracheid wall thickness, and the radial lumen diameter in earlywood and latewood, were also taken into account as additional criteria.…”

“…Furthermore, based on previous studies (Yang et al 1986;Bao et al 2001), the differences in anatomical structure, especially the differences in structural elements' size, tracheid wall thickness, and the radial lumen diameter in earlywood and latewood, were also taken into account as additional criteria.…”

Variation in Wood Quality in White Spruce (Picea Glauca (Moench) Voss). Part I. Defining the Juvenile–Mature Wood Transition Based on Tracheid Length

“…However, as mentioned above, the estimated TA varies with WQA [10][11][12][13] and the analytical method [8,9]. In addition, for a given species, TA varies with tree height [14,15] and across locations [16].…”

Theoretical Description of the Fourier Transform of the Absolute Amplitude Spectra and Its Applications

“…However, most of these methods considered only a limited number of characteristic features of the wood stem (one or two). For example, for a long time, the researchers were focused on the measurements of the annual ring width, the specific gravity, tracheid length and microfibril angle (Fujisaki 1985, Fukazawa 1967, Matyas and Peszlen 1997, Ota 1971, Yang et al 1986, Zhu et al 2000. The method based on the nonlinear, segmented regression method of tracheid length and microfibril angle (Cook andBarbour 1989, Zhu et al 2005) has provided a common and simple tool for analyzing of the growth variation, while at the same time it was not restricted to certain groups of species or types of data.…”