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Abstract Detail



Recent Topics Posters

Sveshnikov, Dmitry [1], Skinner, Randolph [1], Arsenault, André [2].

Survival and acclimation of Eastern white pine along an elevation gradient at the species’ north-eastern extent.

Eastern white pine has potential to be re-established as a significant component of the boreal forest ecosystem in Newfoundland, where the species meets its northern and eastern limits of distribution. We initiated a study to characterize the range of acclimatory responses of white pine under the harsh and variable conditions of Newfoundland, and to evaluate potential constraints on natural and artificial regeneration.
We present preliminary results on phenological, morphological and physiological parameters of a natural population of Eastern white pine distributed along a 200 metre elevation gradient. We also made complementary observations on seedlings planted at four different elevations along the same gradient and surveyed natural regeneration on these sites.
Most of the planted seedlings overwintered successfully, with little variation in the survival rates across the elevation gradient. While there were isolated random cases of apical bud mortality, the main cause of damage or death was the complete removal of the apical bud by herbivores, likely small mammals. The four-week delay in snow cover loss at higher elevation had an expected direct effect on the dormancy break in the seedlings, thus shortening the actual growth season duration.
The established trees showed less pronounced difference in bud break with elevation. In relation to the season length and exposure changes along the gradient, we present and discuss the patterns of needle and branch development, including difference in chlorophyll content, specific needle area, and linear and radial growth as indicators of resource acquisition and biomass accumulation, potentially linked with productivity of the trees.
The relatively small elevation gradient typical for the Newfoundland populations of Eastern white pine has a significant effect on its development, especially for juvenile trees. Studies are underway to further clarify the environmental constraints and acclimatory mechanisms affecting white pine performance at its north-eastern distribution range limit.


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1 - Grenfell Campus, Memorial University of Newfoundland, Environmental Science / Biology, 20 University Drive, Corner Brook, NL, A2H 5G4, Canada
2 - Natural Resources Canada, Canadian Forest Service, Atlantic Forestry Centre, 20 University Drive, Corner Brook, NL, A2H 6J3, Canada

Keywords:
Eastern white pine
ecophysiology
Newfoundland
phenology
Acclimation
resource allocation
Seedlings.

Presentation Type: Recent Topics Poster
Session: P
Location: Hall D/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 5:30 PM
Number: PRT052
Abstract ID:1838
Candidate for Awards:None


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