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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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dc.contributor.author Zulick, Rachel
dc.date.accessioned 2012-08-27T22:00:48Z
dc.date.available 2012-08-27T22:00:48Z
dc.date.issued 2012-08-27
dc.date.submitted July 2012
dc.identifier.uri http://hdl.handle.net/1928/21015
dc.description.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. en_US
dc.language.iso en_US en_US
dc.subject respiration en_US
dc.subject temperature en_US
dc.subject Q10 en_US
dc.subject Populus en_US
dc.subject photosynthesis en_US
dc.subject isotope en_US
dc.subject root en_US
dc.subject.lcsh Cottonwood--Ecophysiology.
dc.subject.lcsh Plants--Effect of heat on.
dc.subject.lcsh Plants--Respiration.
dc.subject.lcsh Gases from plants.
dc.subject.lcsh Carbon cycle (Biogeochemistry)--Rio Grande.
dc.title The effect of increased growth temperature on mid-day and mid-night CO2 fluxes in Populus deltoides en_US
dc.type Thesis en_US
dc.description.degree Biology en_US
dc.description.level Masters en_US
dc.description.department University of New Mexico. Biology Dept. en_US
dc.description.advisor Hanson, David
dc.description.committee-member Litvak, Marcy
dc.description.committee-member Pockman, William


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