Efeito da disponibilidade hídrica e da aplicação de potássio e sódio nas características anatômicas do lenho juvenil de Eucalyptus grandis
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Data
2015
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Resumo
The availability of water and fertilizer in forest stands promotes changes in cambial activity
of trees, causing significant changes in wood anatomical features and wood formation. The study aimed
to evaluate the wood anatomical characteristics of Eucalyptus grandis trees at 24 and 36 months with reduced
rainfall and nutrition of K and Na. Treatments were defined by two water regimes (100% and 66% of rainfall,
artificial reduction with polyethylene tarps) and three types of nutrition: K (4,5 kmol/ha), Na (4,5 kmol/ha)
and control. 3 eucalyptus trees were selected per treatment and age, totaling 36 sampled trees, and discs
samples of wood at 1.3 m height (DBH) were evaluated in relation to anatomical characteristics. The results
showed that treatments nutrition x water availability induced changes in width, wall thickness and lumen
diameter of the fiber at 24 months and did not alter the vessel dimensions in wood of E. grandis trees. The effect of isolated application of K and Na does not influence the wood anatomical characteristics of E. grandis,
except for width, lumen diameter and wall thickness at 24 months. The reduction of the rainfall, with installation
of polyethylene tarp, does not significantly influence the dimension of the fibers and the vessels of wood in
the eucalyptus trees. The results may be used as subsidies for the adoption of silvicultural practices in forest
plantations in areas with water stress, as well as the partial replacement of K by Na.
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Palavras-chave
Nutrição, Formação do lenho, Estresse hídrico induzido, Nutrition, Wood formation, Induced water stress
Citação
FREITAS, Paola de Castro e; SETTE JR., Carlos Roberto; CASTRO, Vinicius Resende de; CHAIX, Gilles; LACLAU, Jean Paul; TOMAZELLO FILHO, Mario. Efeito da disponibilidade hídrica e da aplicação de potássio e sódio nas características anatômicas do lenho juvenil de Eucalyptus grandis. Revista Árvore, Viçosa, v. 39, n. 2, p. 405-416, 2015.