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Abstract Detail



Ecophysiology

Wong, Christopher [1], Ensminger, Ingo [1].

Spring recovery of eastern white pine monitored with spectral reflectance.

Evergreen conifers in boreal and temperate regions undergo strong seasonal changes in photoperiod and temperatures, which characterizes their photosynthetic activity with high activity in the growing season and downregulation during the winter season. Monitoring the timing of the transitions in evergreens is difficult since it’s a largely invisible process, unlike deciduous trees that have a visible budding and senescence sequence. Spectral reflectance and the photochemical reflectance index (PRI), often used as a proxy for photosynthetic light-use efficiency, provides a promising tool to track the transition of evergreens between inactive and active photosynthetic states. To better understand the relationship between PRI and photosynthetic activity, the spring recovery of eastern white pine (Pinus strobus L.) was monitored using spectral reflectance, chlorophyll fluorescence and gas exchange. All metrics indicate photosynthetic recovery during the spring season. These findings indicate that optical remote sensing can be used to observe the spring recovery of photosynthesis. These findings have implications for remote sensing, which provides a promising long-term monitoring system of whole ecosystems, which is important since their roles in the carbon cycle may shift in response to climate change.


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1 - University of Toronto, Ecology and Evolutionary Biology, 3359 Mississauga Road, Mississauga, ON, L5L1C6, Canada

Keywords:
Acclimation
Chlorophyll fluorescence
Conifer
Spectral reflectance
Photosynthesis
Pigments
Spring recovery
Photochemical reflectance index.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Hall D/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 5:30 PM
Number: PEP002
Abstract ID:223
Candidate for Awards:Physiological Section Best poster presentation,Physiological Section Physiological Section Li-COR Prize,CSPB President's Award for Best Student Presentation


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