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Physiological acclimation of Pinus flexilis to drought stress on contrasting slope aspects in Waterton Lakes National Park, Alberta, Canada

Letts, Matthew G ; Nakonechny, Kevin N ; Van Gaalen, K. Eric ; Smith, Cyndi M

Canadian journal of forest research, 2009-03, Vol.39 (3), p.629-641 [Revista revisada por pares]

Ottawa, ON: National Research Council of Canada

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Título:
Physiological acclimation of Pinus flexilis to drought stress on contrasting slope aspects in Waterton Lakes National Park, Alberta, Canada
Autor: Letts, Matthew G ; Nakonechny, Kevin N ; Van Gaalen, K. Eric ; Smith, Cyndi M
Materias: acclimation ; Acclimatization (Plants) ; Analysis ; aspect ; Biological and medical sciences ; carbon ; chlorophyll ; Climate ; climate change ; climatic factors ; conifer needles ; conifers ; Distribution ; Drought ; Environmental aspects ; fluorescence ; forest canopy ; forest trees ; Forestry ; Fundamental and applied biological sciences. Psychology ; Growth ; Isotopes ; microclimate ; photosynthesis ; Pine ; Pinus flexilis ; reflectance ; seasonal variation ; slope ; stable isotopes ; stomatal conductance ; Trees ; water stress ; water use efficiency
Es parte de: Canadian journal of forest research, 2009-03, Vol.39 (3), p.629-641
Notas: http://dx.doi.org/10.1139/X08-206
Descripción: Photosynthetic gas-exchange characteristics were measured in Pinus flexilis James (limber pine) during two drought years in a xeric, subalpine ecosystem of the Rocky Mountains. Limber pine exhibited conservative water-use traits, including low specific leaf area, leaf nitrogen, stomatal conductance, transpiration (E), and light-saturated net photosynthesis (A(max)), but exhibited high needle longevity, water-use efficiency (A(max)/E), and stable carbon isotope composition. Net photosynthesis declined strongly with leaf-to-air vapour pressure deficit, resulting in a bimodal seasonal pattern of A(max). Although very little gas exchange was observed in late summer, photosynthetic activity extended into October. The avoidance of gas exchange during high atmospheric demand maximized whole-season water-use efficiency. Leaf temperature and leaf-to-air vapour pressure deficit were higher on south-facing slopes during both moderate (2006) and severe (2007) drought. Severe drought caused lower stomatal conductance and E on the southeast-facing slope, but neither A(max) nor canopy reflectance indices differed among slope aspects. Although A(max) was lower in 2007 than 2006, branch-length increment did not differ. Foliar stable carbon isotope composition was higher in needles produced in dry years but did not vary among slope aspects. These results indicate that physiological acclimation to water stress prevented among-aspect differences in A(max) and that shoulder-season photosynthesis may become increasingly important in a warmer climate.
Editor: Ottawa, ON: National Research Council of Canada
Idioma: Inglés

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Physiological acclimation of Pinus flexilis to drought stress on contrasting slope aspects in Waterton Lakes National Park, Alberta, Canada

Letts, Matthew G ; Nakonechny, Kevin N ; Van Gaalen, K. Eric ; Smith, Cyndi M

Ottawa, ON: National Research Council of Canada

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