Abstract

ROMERO-SEAS, Alejandra; TOLEDO, Marisol; ZUIDEMA, Pieter A.  and  VAN DER SLEEN, Peter. Radials trajectories growth of timber species, yesquero blanco (Cariniana ianeirensis) and serebó (Schizolobium parahyba), in a subhumid forest of the Guarayos province (Santa Cruz - Bolivia). Ecología en Bolivia [online]. 2015, vol.50, n.1, pp.25-38. ISSN 1605-2528.

Dendrochronology allows to study variations in the growth of the trees. The following research questions were addressed: The growth trajectories of yesquero blanco (Cariniana ianeirensis Kunth) and serebó (Schizolobium parahyba Vell S. F. Blake) species that belong to different ecological guilds? And how these changes in trajectories is due to precipitation or are a consequence of their local adaptative strategies. Objectives were 1) to asses if rings are formed annually in the stem of yesquero blanco and serebó and 2) to evaluate changes in the growth trajectories of these species. We colleded 207 samples of cores and disks from La Chonta (Prov. Guarayos) and the privately farm Don Humberto (Prov. Sara). We applied standard dendrochronological method. The annual ring formation in yesquero blanco was shown with a positive correlation between the average width of the ring and the annual precipitation (r = 0,73; p = 0,003). In serebó there was no synchronized growth, but we found proof for the formation of annual growth rings with samples. The majority of individuals of yesquero blanco achieved 25 dbh (diameter at breast height) in the first 40 years, although some of them only reached 65 cm dbh in 130 years. On the other hand, the majority of serebó trees achieved 10 cm dbh in the first three years and 30 cm dbh at the age of 12 years. Radial growth trajectories, considering that these are species of different ecological guilds showed different growth patterns for each species as well as for individuals of the same species.

Keywords : Dendrochronology; Growth rings; Growth trajectories.

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