INVESTIGADORES
FERNANDEZ Maria Elena
artículos
Título:
Ecophysiological basis of wood formation in ponderosa pine: linking water flux patterns with wood microdensity variables
Autor/es:
MARTÍNEZ MEIER A; FERNÁNDEZ M.E.; DALLA SALDA G; GYENGE JE; LICATA J; ROZENBERG P
Revista:
FOREST ECOLOGY AND MANAGEMENT
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2015 vol. 346 p. 31 - 40
ISSN:
0378-1127
Resumen:
Climate and stands management have an effect on the
process of wood formation via resource availability. To improve knowledge of
wood quantity and physical structure, increment cores of ponderosa pine were
taken in high- and low-density stands growing in Patagonia, Argentina.
Microdensity profiles were performed on trees for which sapflow density (Qs) data were available
over two consecutive years (2004 and 2005, dry and wet years, respectively). Conventional
and non-conventional microdensity variables were analyzed in the segment of the
microdensity profile where Qs was measured. Trees in the low-density stand showed a greater capacity for water
transport than trees in the high-density stand, even if no constraints in the
soil water availability were confirmed, as was the case for the wet year. Minimum
and earlywood density were significantly higher in the high-density stand in
several analyzed years. These differences were not reflected in mean density of
the whole radial profile. The structural changes in physical wood properties in
relation to silvicultural treatments appear to affect plant water status, even
in the wet growing season: greater wood density in the first part of the
tree-ring may contribute to the observed Qs decrease found in the high-density
stand. This fact may lead trees to lack the coordinated mechanisms of response
to drought observed in more xeric sites. The increase of wood density in the
first part of the tree-ring in ponderosa pine could be not conducive to
acclimation, exposing trees to an increasing ??dilemma?? facing drought.