INVESTIGADORES
PUNTIERI javier Guido
artículos
Título:
An architectural approach to the growth forms of Nothofagus pumilio (Nothofagaceae) along an altitudinal gradient
Autor/es:
MARINA STECCONI; JAVIER GUIDO PUNTIERI; BARTHELEMY, DANIEL
Revista:
BOTANY
Editorial:
NATL RESEARCH COUNCIL CANADA-N R C RESEARCH PRESS
Referencias:
Lugar: Ottawa; Año: 2010 vol. 88 p. 699 - 709
ISSN:
1916-2790
Resumen:
Variations in the architecture and axis structure of different growth forms of Nothofagus pumilio (Poepp. et
Endl.) Krasser (Nothofagaceae) were studied along an altitudinal gradient. We evaluated the primary growth and branching
pattern of annual shoots belonging to the main axis categories (trunk, main branches, and secondary (short) branches) of
four growth forms developed at different altitudes (12001600m a.s.l.) in northern Patagonia: (i) low shrubs at the highaltitude
timberline, (ii) high shrubs at high altitude, (iii) low trees at mid-altitude slopes, and (iv) high trees at low-altitude
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
timberline, (ii) high shrubs at high altitude, (iii) low trees at mid-altitude slopes, and (iv) high trees at low-altitude
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
timberline, (ii) high shrubs at high altitude, (iii) low trees at mid-altitude slopes, and (iv) high trees at low-altitude
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
Endl.) Krasser (Nothofagaceae) were studied along an altitudinal gradient. We evaluated the primary growth and branching
pattern of annual shoots belonging to the main axis categories (trunk, main branches, and secondary (short) branches) of
four growth forms developed at different altitudes (12001600m a.s.l.) in northern Patagonia: (i) low shrubs at the highaltitude
timberline, (ii) high shrubs at high altitude, (iii) low trees at mid-altitude slopes, and (iv) high trees at low-altitude
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
timberline, (ii) high shrubs at high altitude, (iii) low trees at mid-altitude slopes, and (iv) high trees at low-altitude
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
timberline, (ii) high shrubs at high altitude, (iii) low trees at mid-altitude slopes, and (iv) high trees at low-altitude
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
Endl.) Krasser (Nothofagaceae) were studied along an altitudinal gradient. We evaluated the primary growth and branching
pattern of annual shoots belonging to the main axis categories (trunk, main branches, and secondary (short) branches) of
four growth forms developed at different altitudes (12001600m a.s.l.) in northern Patagonia: (i) low shrubs at the highaltitude
timberline, (ii) high shrubs at high altitude, (iii) low trees at mid-altitude slopes, and (iv) high trees at low-altitude
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
timberline, (ii) high shrubs at high altitude, (iii) low trees at mid-altitude slopes, and (iv) high trees at low-altitude
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
timberline, (ii) high shrubs at high altitude, (iii) low trees at mid-altitude slopes, and (iv) high trees at low-altitude
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
Nothofagus pumilio (Poepp. et
Endl.) Krasser (Nothofagaceae) were studied along an altitudinal gradient. We evaluated the primary growth and branching
pattern of annual shoots belonging to the main axis categories (trunk, main branches, and secondary (short) branches) of
four growth forms developed at different altitudes (12001600m a.s.l.) in northern Patagonia: (i) low shrubs at the highaltitude
timberline, (ii) high shrubs at high altitude, (iii) low trees at mid-altitude slopes, and (iv) high trees at low-altitude
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
timberline, (ii) high shrubs at high altitude, (iii) low trees at mid-altitude slopes, and (iv) high trees at low-altitude
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
timberline, (ii) high shrubs at high altitude, (iii) low trees at mid-altitude slopes, and (iv) high trees at low-altitude
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
i) low shrubs at the highaltitude
timberline, (ii) high shrubs at high altitude, (iii) low trees at mid-altitude slopes, and (iv) high trees at low-altitude
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.
ii) high shrubs at high altitude, (iii) low trees at mid-altitude slopes, and (iv) high trees at low-altitude
single-species forests. Shoot structure and branch distribution along shoots were similar for all axis categories and
growth forms. Significant differences between axis categories were found regarding the sizes of shoots, which decreased
from trunk to secondary/short branches. For each axis category, shoots of similar size differed between growth
forms in stem slenderness and internode length. The extent of differentiation between axis categories is key in the
structural distinction between growth forms of N. pumilio.N. pumilio.