Abstract

CALLEJA-PELAEZ, Beatriz et al. Tree structure in two exposures of a pine forest in Cochoapa El Grande, state of Guerrero. Rev. mex. de cienc. forestales [online]. 2024, vol.15, n.85, pp.48-69.  Epub Nov 19, 2024. ISSN 2007-1132.  https://doi.org/10.29298/rmcf.v15i85.1461.

The objective of this research was to evaluate the structure, composition and similarity of tree species in two exposures: Northwest (NW) and Southeast (SE) of a temperate forest in the community of Cochoapa El Grande, Guerrero, Mexico. In each of the exposures, six plots of 500 m2 each were randomly established. The assessed mensuration variables were total height (m) and normal diameter (m) (ND, d 1.30m , cm); the mensuration distribution, Importance Value Index (IVI), Pretzsch Index, and Sørensen's similarity index were determined based on those variables. The average density of the area was 810 ind ha-1, with four Pinus species; the SE exposure had the highest abundance (1 040 ind ha-1), with a basimetric area of 25.30 m2 ha-1 and a volume of 225.21 m3 ha-1. In the NW exposure, three species were recorded, with 580 ind ha-1, 39.80 m2 ha-1, and a volume of 415.15 m3 ha-1. The species with the highest IVI value was P. pseudostrobus (NW=86.86 % and SE=68.65 %). Three strata were defined by means of the Pretzsch Index: The values for the NW exposure were A=1.30, A max =2.20, and A rel =59.08 %; in the SE exposure, the recorded values were A=1.26, A max =2.48, and A rel =50.69 %. The tree composition exhibited a high similarity (86 %) between the two exposures. Exposure and climatic conditions contribute to the distribution and adaptation of various species, as height and basimetric area parameters are modified.

Keywords : Basimetric area; Pretzsch Index; Sørensen's Similarity Index; Importance Value Index; Pinus pseudostrobus Lindl.; volume.

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