Wood Density-Climate Relationships Are Mediated by Dominance Class in Black Spruce (Picea mariana (Mill.) B.S.P.)

Abstract

Abstract:The relationships between climate and wood density components, i.e., minimum ring density, maximum ring density and mean ring density have been studied mainly in dominant trees. However, the applicability of the findings to trees of other dominance classes is unclear. The aim of this study was to address whether climate differentially influences wood density components among dominance classes. X-ray densitometry data was obtained from 72 black spruce (Picea mariana (Mill.) B.S.P.) trees harvested in Northwestern Ontario, Canada. Dominant, co-dominant and intermediate trees were sampled and the data analysed using mixed-effect modelling techniques. For each density component, models were first fitted to the pooled data using ring width and cambial age as predictors, before monthly climatic variables were integrated into the models. Then, separate models were fitted to the data from each dominance class. In general, the addition of climatic factors led to a small but significant improvement in model performance. The predicted historical trends were well synchronized with the observed data. Our results indicate that trees from all dominance classes in a stand should be sampled in order to fully characterize wood density-climate relationships. OPEN ACCESSForests 2014, 5 1164

Dendrocronologia em árvores de espécies de restauração florestal

“…Essa variação pode ser mensurada pela microdensitometria de raios X, técnica que permite a leitura da densidade aparente em intervalos micrométricos (POLGE, 1966;TOMAZELLO-FILHO et al, 2008;MIL et al, 2018). Essa metodologia vem sendo aplicada como suporte para estudos dendrológicos, como a dendrocronologia e dendroclimatologia (XIANG et al, 2014;KLUSEK;MELVIN;GRABNER, 2015;PAGOTTO et al, 2017).…”