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T-Space at The University of Toronto Libraries >
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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/30592

Title: Effects of an Early Season Heat Wave on Ecophysiological Parameters Related to Productivity in Sugar Maple (Acer saccharum Marsh.)
Authors: Filewod, Benjamin A.
Advisor: Thomas, Sean C.
Department: Forestry
Keywords: forestry
plant physiology
climate change
heat wave
ontogeny
canopy gradients
productivity
carbon cycling
age/size changes
Sugar Maple
Acer saccharum
temperature forests
leaf neoformation
leaf shedding
ontogenetic variation
Issue Date: 7-Dec-2011
Abstract: Anticipated increases in the frequency, duration or intensity of high temperature events ('heat waves') have the potential to significantly impact forest form and functioning, but these events remain virtually unstudied in forest ecosystems. This thesis presents the results of an event-driven research effort into the impacts of three days of record-setting high temperatures in late May 2010 on key ecophysiological parameters in Sugar Maple (Acer saccharum. Marsh). High temperatures reduced photosynthetic capacity by ~66% versus previous years and total end-of-season leaf litter production by ~33% versus prior measurements. It is predicted that these reductions substantially reduced productivity for Sugar Maple in 2010. These results constitute the first description of the impacts of a short-duration heat wave on productivity-related parameters in a temperate forest tree. The predicted increase in high temperature events could make such impacts a significant, though so far overlooked, pathway of climate change impacts on temperate forests.
URI: http://hdl.handle.net/1807/30592
Appears in Collections:Master

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