Resumo

VILLEGAS-JIMENEZ, Daniel E. et al. Aboveground biomass allocation of Pinus greggii provenances planted in southern México. Rev. fitotec. mex [online]. 2013, vol.36, n.4, pp.421-427. ISSN 0187-7380.

Biomass allocation on the tree may be influenced by climate, soil conditions, light competition and genetic differences among trees. Aboveg-round biomass components were estimated in 13 Mexican provenances of Pinus greggii Engelm. planted in 1997 in Southern México. Biomass data were collected in 2011 from 106 random samples of branches and 60 standing trees. Data sampling was distributed under a randomized block design. Significant differences (P ≤ 0.05) among provenances in biomass accumulation of needles and wood + bark were found. The highest leaf biomass accumulation was for provenances from Central México, El Piñón y Molango (5.1 t ha^-1). Among the northern provenances, Los Lirios accumulated the highest biomass in wood + bark (19.4 t ha^-1). No differences among provenances were found in branch biomass, with an average of 9.5 t ha^-1, and neither in total accumulated biomass which was 25.6 t ha^-1, for 14 year-old trees. Total biomass was distributed 52.0, 33.6 and 14.4 % for wood + bark, branches and leaves, respectively.

Palavras-chave : Pinus greggii; biomass accumulation; forest floor; provenances.