Dendrocronologia, fenologia, atividade cambial e qualidade do lenho de árvores de Cedrela odorata L., Cedrela fissilis Vell. e Schizolobium parahyba var. amazonicum Hub. ex Ducke, no estado do Acre, Brasil

Comparative analysis of anatomy and micro-densitometry of the growth rings of hardwoods and conifers, with emphasis on dendrochronology

“…The wood of these two species had higher vessel concentration with larger diameter formed at the beginning of the vegetative period of the trees. Cedrela odorata (Meliaceae) is a well known tree species with the cambial activity, formation of tree-rings and growth dynamics presented by Dünisch et al, (2002), Marcati et al, (2006) and Lobão (2011); related to climatic signals (ANDREACCI et al, 2014); to determine the periodicity and trunk growth increments , for dendrochronology (TOMAZELLO FI-LHO et al, 2000 and dendro-ecological analysis (ALVES; ANGYALOSSY- ALFONSO, 2000;DÜNISCH et al, 2003). Similarly, the growth rings formed in Tectona grandis trees constitute a valuable tool applied to numerous research abroad and in Brazil correlating with the climatic variables (PUMIJUMNONG et al, 1995;RAM et al, 2008;UGOLINO et al, 2014), as well with the wood quality (CASTRO et al, 2011).…”

“…parahyba (Fabaceae-Caesalpinoideae) (Figure 2-13) has distinct growth rings, delimited by a fibrous zone (thickening of the fiber wall, flattening of radial wall) and marginal parenchyma band (CURY, 2002, TOMAZELLO FILHO et al, 2004. Several authors, used tree-rings of this tree species for detection the seasonal wood development (MARCATI et al, 2008); mortality tree diagnosis (CALLADO; GUIMARÃES, 2010), phenology and cambial activity and their relationship with wood formation and quality (LISI et al, 2008;LOBÃO, 2011;LOBÃO et al, 2012;COSTA et al, 2015) and dendrochronological issues (LATORRACA et al, 2015).…”

“…Concerning the Meliaceae family, their representative species of Swietenia macrophylla, Cedrela odorata and C. fissilis were analyzed with respect to the tree rings width and wood density variation, dendrochronology, cambium activity and sustainable forest management (ALVARADO et al, 2010;LOBÃO, 2011, SCHIPPER-GUEROVICH, 2011. The wood density profile of Cedrela odorata ( Figure 2-5, Table 2) is not comparable with that observed in the conifers wood; the main characteristic is the abrupt drop of wood density (equivalent to the marginal parenchyma and semi-ring porous, representing the earlywood with 0.5 g/cm 3 ) followed by a gradual increase of density (equivalent to less vessel frequency and thicker fiber cell wall, representing the latewood with 0.9 g/cm 3 ).…”

“…More recently, wood X-ray densitometry has been applied as a useful and complementary methodology facilitating the delimitation and measurement of growth rings in several temperate, tropical and subtropical tree species due to the differentiated attenuation of X-rays through the wood tissues (MOTHE et al, 1998;KOUBAA, et al, 2002;LOBÃO, 2011). Among the scientific studies the methodology has preferably been applied for coniferous, broadleaves and introduced tree species, such as araucaria (WEHR; , pinus (FERREIRA; CASTRO et al, 2014) and eucalyptus trees OLIVEIRA et al, 2012KNAPIC et al, 2014.…”

Caracterização morfológica e química da madeira de Schizolobium amazonicum aos 14 anos de plantios no estado de Rondônia

“…Conforme Lobão (2011) há grande demanda por madeira de árvores de espécies tropicais, tal como a de Schizolobium parahyba var. amazonicum (sinonímia empregada por alguns autores para designar a espécie em referência), porém, é escassa a literatura sobre a qualidade do seu lenho.…”