Índices de qualidade das fibras das madeiras de Corymbia spp. Eucalyptus spp. para seleção de materiais genéticos destinados a produção de polpa celulósica

Wagner Patrício de Sousa Júnior; Ana Márcia Macedo Ladeira Carvalho; Angélica de Cássia Oliveira Carneiro; Iara Fontes Demuner; Rudson Silva Oliveira; Lilian Alves Carvalho Reis; Leila Aparecida Lopes; Sherellyn Daphnee Alves Moretti

doi:10.53661/1806-9088202549263840

Authors

Wagner Patrício de Sousa Júnior Instituto Federal do Norte de Minas Gerais, Salinas, MG, Brasil https://orcid.org/0000-0001-5264-0745
Ana Márcia Macedo Ladeira Carvalho Universidade Federal de Viçosa, Departamento de Engenharia Florestal, Viçosa, MG, Brasil https://orcid.org/0000-0002-5883-8987
Angélica de Cássia Oliveira Carneiro Universidade Federal de Viçosa, Departamento de Engenharia Florestal, Viçosa, MG, Brasil https://orcid.org/0000-0002-5992-3059
Iara Fontes Demuner Universidade Federal de Viçosa, Departamento de Engenharia Florestal, Viçosa, MG, Brasil https://orcid.org/0000-0002-2628-9637
Rudson Silva Oliveira Aperam bioenergia, Capelinha, MG, Brasil https://orcid.org/0000-0002-9659-9331
Lilian Alves Carvalho Reis Universidade Federal de Viçosa, Doutorado em Fisiologia Vegetal, Viçosa, MG, Brasil https://orcid.org/0009-0002-0121-6527
Leila Aparecida Lopes Sociedade de Investigações Florestais, Viçosa, MG, Brasil https://orcid.org/0009-0008-9874-2454
Sherellyn Daphnee Alves Moretti Universidade Federal de Viçosa, Mestrado em Ciência Florestal, Viçosa, MG, Brasil https://ror.org/0409dgb37 https://orcid.org/0000-0003-3197-5305

DOI:

https://doi.org/10.53661/1806-9088202549263840

Keywords:

Runkel ratio, Mechanical resistance of cellulose pulp, Fiber flexibility

Abstract

The selection of genetic materials for obtaining cellulosic pulp and paper production necessitates evidence of efficiency in terms of silvicultural performance and industrial processing. In this context, this study aimed to select genetic materials from Eucalyptus spp. and Corymbia spp. for pulp production. The selection was achieved through cluster analysis, based on the morphological traits of the main anatomical elements of the wood, the screened brown pulp yield, and fiber quality indices (Runkel ratio, slenderness ratio, Mulsteph coefficient, and flexibility coefficient). Sixteen genetic materials were evaluated, each represented by three trees of average diameter, collected at 81 months of age with a planting spacing of 6x1.5 m, from plantations located in the municipality of Itamarandiba - MG, Brazil. Axiovision 4.8 software was used to measure the dimensions of fibers and vessels under an optical microscope. Information regarding the screened pulping yield for these genetic materials was obtained from literature. Three distinct groups of genetic materials emerged from cluster analysis. In group I, hybrids with longer and less flexible fibers (Runkel ratio >1, wall fraction >50%, and flexibility coefficient <50%) predominated, making them more suitable for manufacturing absorbent papers. In contrast, groups II and III comprised genetic materials with higher screened yields (>52.0%), lower wall fractions (<50%), and other fiber quality indices indicating a predominance of more flexible fibers (flexibility coefficient >50% and slenderness ratio >51%). These fibers are primarily more suitable for producing tear- and burst-resistant papers, intended for packaging and bags.

Keywords: Runkel ratio; Mechanical resistance of cellulose pulp; Fiber flexibility