Resumo

RODRIGUEZ-ORTIZ, Gerardo et al. Does thinning affect aboveground biomass acummulation in a Pinus patula plantation?. Agrociencia [online]. 2011, vol.45, n.6, pp.719-732. ISSN 2521-9766.

Thinning may modify distribution and amount of aboveground biomass according to time of response and growth conditions. In this study, the effect of thinning on distribution and accumulated aboveground biomass content of Pinus patula was analyzed in 2009 through destructive samplings of 30 trees, after having been subjected to different thinning intensities since 2004, plus an intact control. Elimination between 40 and 69 % of initial plantation density significantly affected (p≤0.05) quantity and distribution of leaf biomass and the amount of timber with bark on the stem at individual tree level in some tree components (but not by ha). The high thinning intensity (65.3 and 68.7 %) and respective low residual density generated the largest accumulation of foliar biomass (5.4 kg tree^-1 and 8.0 t ha^-1), surpassing (p≤0.05) the control without thinning (1.5 kg tree^-1). In timber biomass with stem bark, trees with thinning also surpassed (p≤0.05) the control (98 fs. 35.3 kg tree^-1). However, biomass accumulation per unit was similar between both conditions, due to excessive residual density of the control; the same occurred in total branch biomass and in distribution on the stem.

Palavras-chave : tree components; phytomass; forest plantation; net primary productivity.

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