University of Illinois Urbana-Champaign

The Effect of Elevated Carbon Dioxide and Ozone on Soybean Development, Leaf Anatomy and Productivity

Castro, Joseph Carlos

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Description

Title
The Effect of Elevated Carbon Dioxide and Ozone on Soybean Development, Leaf Anatomy and Productivity
Author(s)
Castro, Joseph Carlos
Issue Date
2010
Doctoral Committee Chair(s)
Long, Stephen P.
Department of Study
Biology
Discipline
Biology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Biology, Plant Physiology
Language
eng
Abstract
Leaf area is significantly reduced in elevated [O3]; however, it is significantly increased in elevated [CO2]. This increase in leaf area, along with the increased number of main stem nodes, result in the previously reported increase in leaf area index observed in soybeans grown in elevated [CO2]. This increased photosynthetic tissue, along with increases in light-saturated photosynthesis observed under elevated atmospheric [CO21 is expected to result in a proportional increase in canopy photosynthesis or gross primary production (GPP). A draw-back of FACE is that GPP cannot be measured directly. Measurements of micrometeorology, leaf photosynthetic properties and canopy structure were combined in an adapted version of the Integrated Scientific Assessment Model (ISAM) to estimate GPP. The results of this model showed an increase in diurnal GPP, which resulted in a season-long 30% stimulation of both GPP and net primary production (NPP). Although the NPP modeled in this way agreed closely in absolute terms with that estimated from biomass measurements, the stimulation in NPP due to elevated [CO 2] was very much higher than the biomass measurements showed. The potential causes of this discrepancy are discussed and indicate new questions to be addressed.
Graduation Semester
2010
Type of Resource
text
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http://hdl.handle.net/2142/85386

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