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The effect of increased growth temperature on mid-day and mid-night CO2 fluxes in Populus deltoides

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/21015

The effect of increased growth temperature on mid-day and mid-night CO2 fluxes in Populus deltoides

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Title: The effect of increased growth temperature on mid-day and mid-night CO2 fluxes in Populus deltoides
Author: Zulick, Rachel
Advisor(s): Hanson, David
Committee Member(s): Litvak, Marcy
Pockman, William
Department: University of New Mexico. Biology Dept.
Subject: respiration
temperature
Q10
Populus
photosynthesis
isotope
root
LC Subject(s): Cottonwood--Ecophysiology.
Plants--Effect of heat on.
Plants--Respiration.
Gases from plants.
Carbon cycle (Biogeochemistry)--Rio Grande.
Degree Level: Masters
Abstract: As global temperatures rise, understanding the effects of increased temperature on daily carbon dioxide fluxes is necessary to predict changes to the global carbon cycle. Using tunable diode laser spectroscopy, I measured CO2 fluxes and changes in isotopic composition of root respiration, leaf respiration and photosynthesis over a 12-hour night to day transition. I found that after a 10˚C increase in growth temperature for four weeks, root CO2 fluxes acclimated to the higher temperature (i.e. they were not significantly different from controls). In contrast, both photosynthesis and respiration of leaves were higher at the elevated growth temperature. Though the root fluxes were not significantly different between growth temperatures, two patterns may become significant with greater replication: (1) the difference in rates of mid-day/mid-night root respiration in plants grown at 22˚C may be greater than those grown at 32˚C and (2) variability in the isotopic composition of root respired CO2 is greater during the mid-night period compared to mid-day period. These data show that leaves and roots respond differently to grow temperature and suggest that root respiration during the day may respond to temperature differently from root respiration at night.
Graduation Date: July 2012
URI: http://hdl.handle.net/1928/21015


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