Wood Inter- and Intra-annual Chemical Variation

A special issue of Forests (ISSN 1999-4907). This special issue belongs to the section "Wood Science and Forest Products".

Deadline for manuscript submissions: 26 August 2024 | Viewed by 172

Special Issue Editors

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Guest Editor
Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal
Interests: chemometrics; near infrared spectroscopy; wood science; wood chemistry; wood products; Eucalyptus; lignin; PY-GC-MS; Fourier transform infrared spectroscopy; forestry; lignocellulose degradation; lignocellulosic conversion; biofuel production; biomass conversion; hydrothermal treatment; wood anatomy
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal
Interests: wood chemistry; lignin methods; pyrolysis PY-GC/MS and PY-GC/FID; Fourier transform infrared spectroscopy; plant biotechnology; principal component analysis

Special Issue Information

Dear Colleagues,

Wood formation is a continuous process of cell proliferation, specialization, expansion, and death, regulated by both external (photoperiod and temperature) and internal (phytohormones) factors, as well as their interactions. Annual growth rings, especially evident in the temperate zone of softwood trees, are a good example of seasonal rhythm formation associated with changes in the environment. Besides this earlywood/latewood change, the formation of juvenile and mature wood is mainly associated with internal changes, namely the maturity of the cambium. Except for a steep decrease in the extractive content and the lower lignin content in mature wood, very little is known about the variation in wood chemistry between and within growth rings. One of the main drawbacks is the large sample amount required by wet chemical methods. The development of analytical pyrolysis capable of discriminating minute chemical differences and requiring samples in the microgram range is a fine example. Spectroscopic methods can also play an important role in reducing the actual knowledge gap regarding the variation in the chemical composition at this fine level.

This will be used for the development of dendrochemistry at the biochemical level, as well as our understanding of the environment in wood chemistry.

We invite authors to contribute to this Special Issue with results on inter or intra-annual variation, as well as methodologies that could be potentially useful for this end.

Dr. José Carlos Carvalho Rodrigues
Dr. Ana Alves
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Forests is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.


  • annual growth rings
  • earlywood/latewood
  • juvenile/mature wood
  • wood chemistry
  • analytical pyrolysis
  • vibrational spectroscopy
  • extractives
  • lignin content and composition
  • cellulose
  • hemicelluloses

Published Papers

This special issue is now open for submission, see below for planned papers.

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Lignin content and the S/G ratio of Eucalyptus globulus vary more between trees within countries than between countries, regardless of age differences.
Authors: Ana Alves; José Rodrigues
Affiliation: Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa
Abstract: This study investigated the natural variation in lignin content and S/G ratio of Eucalyptus globulus from native Australian (AU) trees and introduced trees from Argentina (AR), Portugal (PT), and Uruguay (UY). Even though Klason lignin content (18–24%) and S/G ratio (1.58–2.41) varied considerably between trees, the differences between countries were smaller but significant: AU (20.5%; 1.97), PT (20.2%; 2.02), AR (21.7%; 1.94), and UY (21.7%; 2.16). Based on normalized data, Principal Component Analysis (PCA) of lignin pyrolysis products shows that AU and AR are in the same group and are different from PT along PC 1 (24%), which is different from UY along PC 2 (20%). The main variation along PC 1 (48%) based on mean-centred data is due to the tree-to-tree variation of the most important lignin peak, S4 (syringol, 4-propenyl-trans), which accounts for 14% of the total lignin peaks. Higher percentages of S10 (sinapinaldehyde), S1 (syringol), and S5 (syringaldehyde), which together made up 24% of lignin peaks, are primarily responsible for the differentiation of PT from AU/AR along PC 2 (21%). Age does not affect the S/G ratio, and it is unlikely to be responsible for the lignin structural differences between countries.

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