Variation in the Basic Density of Woods Produced in the Brazilian Semiarid Region Subjected to Different Irrigation Regimes
Author:
Santos Márcia Ellen Chagas dos1ORCID, Melo Rafael Rodolfo de1ORCID, Correia Diva2, Sousa João Alencar de2, Santos Alisson Moura3ORCID, Silva Ana Karla Vieira da1ORCID, Paula Edgley Alves de Oliveira1, Alves Allyson Rocha1, Scatolino Mário Vanoli1, Rusch Fernando1ORCID, Mascarenhas Adriano Reis Prazeres4ORCID, Pimenta Alexandre Santos5, Stangerlin Diego Martins6
Affiliation:
1. Department of Agronomic and Forestry Sciences-DCAF, Federal University of the Semiarid Region—UFERSA, Mossoró 59625-900, RN, Brazil 2. Brazilian Agricultural Research Corporation-Embrapa Tropical Agroindustry, Fortaleza 60511-110, CE, Brazil 3. Brazilian Agricultural Research Corporation-Embrapa Forestry, Colombo 83411-000, PR, Brazil 4. Department of Forestry Engineering, Federal University of Rondônia—UNIR, Rolim de Moura 76801-059, RO, Brazil 5. Jundiaí Agricultural School-EAJ, Federal University of Rio Grande do Norte—UFRN, Macaíba 59280-000, RN, Brazil 6. Institute of Agricultural and Environmental Sciences-ICAA, Federal University of Mato Grosso—UFMT, Sinop 78550-728, RN, Brazil
Abstract
The present work aimed to evaluate the wood of fourteen genetic materials (nine species, between native and exotic, and five clones of Eucalyptus) cultivated under two post-planting irrigation regimes in the Brazilian semiarid region. For each genotype, six trees (11 years old) were selected and subjected to two initial irrigation regimes (up to 12 months and up to 36 months) after planting. Discs of different stem heights were taken: 0% (base), breast height (DBH), 20%, 40%, 60%, 80%, and 100%. Samples were extracted along the radial axis of each disk at three regions (the pith-adjacent region, intermediate region, and bark-adjacent region). Samples were subsequently saturated in water to determine their density via the water displacement method. The irrigation systems caused changes in the pattern of radial and longitudinal variation in the clones regarding the proportion of woody material in the stem. Among the native species, Angico stood out with a high density and little juvenile wood, and Pau d’arco, with a low density and a high rate of juvenile wood. Among the exotic species, Nim presented a high density and a low rate of juvenile wood, and Chichá presented a high rate of juvenile wood and a low density. In the Eucalyptus hybrids, VE38 stood out with a high density. Overall, there was an influence from irrigation management, observed with greater intensity in exotic species for Mahogany and Acacia and for the VE41 and AEC1528 clones of Eucalyptus. The values of basic densities in the trees varied from 0.35 to 0.85 g·cm−3. There was good adaptation of native and exotic species and clones to the planting area in the Semiarid region.
Funder
Development Agency of the State of Ceará Banco do Nordeste do Brasil Brazilian Agricultural Research Corporation—Embrapa Coordinate Improvement of Higher Education Personnel Brazilian National Council for Scientific and Technological Development
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