Russian Journal of Ecosystem Ecology (Sep 2024)

CROWN STRUCTURE OF SALIX CINEREA L. (SALICACEAE) INDIVIDUALS: CLASSIFICATION OF SHOOTS AND SHOOT SYSTEMS, METAMER VARIANTS, ARCHITECTURAL MODULES

  • O.I. Nedoseko,
  • N.A. Leonova

DOI
https://doi.org/10.21685/2500-0578-2024-2-2
Journal volume & issue
no. 2

Abstract

Read online

The structural and functional organization of the crowns of boreal species of trees and shrubs, including willows, has not yet been sufficiently studied. The article analyzes the structure of the modular elements of the crown of S. cinerea. Materials and methods. The classification of shoots and crown shoot systems is based on three features: 1) the length of the internodes that make up the shoot, 2) the age of the shoot, 3) the presence of branching. The following classification of modular elements is used in the work: metamer, uniaxial shoot, three-year shoot system, branch from the trunk, crown as a whole. At the same time, the three-year shoot system is considered as an architectural module. The study of three-year-old shoot systems was carried out separately in female and male individuals, which revealed gender differences in the structural organization of their crowns. Results and conclusions. S. cinerea in its adult state can form life forms: a geoxyl shrub in two modifications – epigeogenic-geoxyl and hypogeogenic- geoxyl shrubs, as well as a life form of a semi-aquatic long-silorizome plantain. All life forms are confined to different environmental conditions. The life forms of the geoxyl shrub have 8 main variants of vegetative shoots of three types: short, medium-length and long. In individuals of S. cinerea of the life form of the semi-aquatic longsilorizome plantain, long shoots are not found in the crown, only 6 main variants of shoots belonging to two types have been identified: short and medium length. Medium-length shoots play the greatest role in the organization of the crowns of various life forms. Along with vegetative shoots in the crown of S. cinerea, vegetative generative shoots of regular renewal are isolated, the lower part of which remains in the crown until autumn and silleptic generative shoots from the vegetative.

Keywords