WOOD DENSITY OF Pinus hartwegii Lind. AT TWO ALTITUDE AND EXPOSITION LEVELS
Por:
Morgado-González G., Gómez-Guerrero A., Villanueva-Díaz J., Terrazas T., Ramírez-Herrera C., Hernandez de la Rosa, Patricia
Publicada:
1 may 2019
Resumen:
The wood density of the forest species that form annual growth rings
represents a natural archive related with climate variability. The
objective of this study was to evaluate if the X-ray computed tomography
(XRCT) method is able to detect radial changes in wood density and if it
varies according to altitude and exposition of the site; therefore, that
method with a medical equipment (XRCT) was used to obtain radial density
profiles for Pinus hartwegii Lind. The wood samples came from four
contrasting sites at the TIaloc volcano, two altitudinal levels (3500
and 3900 mad), and two exposition levels (NW and SW). A general linear
model -including the total ring width as a co-variable- was used to
evaluate the simple and interaction effects of altitude and exposition
on wood density. There were statistically significant differences among
sites (p <= 0.001). The altitude*exposition interaction was
significant (p <= 0.001), which indicated that changes in wood density
are influenced by altitude; however, the degree of change depends on the
exposition. In the NW exposition, altitude had a positive effect on wood
density, while, in the SW exposition, there was no effect. There was a
greater wood density in the site with NW exposition and an altitude of
3500 mast. The ring width -as a transformed variable- helps to explain a
significant part of the variance of the radial density of wood between
sites. X-ray computed tomography allowed to study the variation of wood
density and, reliably and accurately, to deduce which changes can be
attributed to the recent climate variation.
Filiaciones:
Colegio Postgrad, Campus Montecillo, Montecillo 56230, Estado De Mexic, Mexico
Inst Nacl Invest Forestales Agr & Pecuarias, Ctr Nacl Invest Disciplinaria Relac Agua Suelo Pl, INIFAP CENID RASPA, Margen Derecha Canal Sacramento Km 6-5, Gomez Palacio 35140, Durango, Mexico
Univ Nacl Autonoma Mexico, Inst Biol, Ciudad Univ, Mexico City 04510, DF, Mexico
Colegio de Postgraduados, Campus Montecillo, km 36.5 Carretera México-Texcoco, Montecillo, Estado de México, 56230, Mexico
Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias, Centro Nacional de Investigación Disciplinaria Relación Agua-Suelo-Planta Atmósfera (INIFAP-CENID-RASPA), Margen Derecha del Canal Sacramento Km 6.5, Gómez Palacio, Durango, 35140, Mexico
Instituto de Biología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Del. Coyoacán, México D.F., 04510, Mexico
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