102800 Apparent Contradictions in 13 C Discrimination, Normalized Transpiration Efficiency and Wheat Water Use Efficiency.

Poster Number 455-818

See more from this Division: ASA Section: Climatology and Modeling
See more from this Session: Honoring the Contributions of Laj Ahuja: Building Bridges Among Disciplines By Synthesizing and Quantifying Soil and Plant Processes for Whole Systems Modeling Poster

Wednesday, November 9, 2016
Phoenix Convention Center North, Exhibit Hall CDE

Robert M. Aiken, 105 Experiment Farm Road, Kansas State University, Colby, KS
Abstract:
Both transpiration efficiency and 13C discrimination (Δ) are related to the partial pressure of CO2 in the leaf, relative to ambient. Field observations demonstrate a positive relationship of seasonal water use efficiency (kg biomass/ha mm) and Δ, which appears to contradict the negative relationship of normalized transpiration efficiency (nTE) and Δ. Deriving, from theory, the transpiration fraction of field crop water use (CWU), this contraction appears to be resolved. A dual-source energy balance algorithm is utilized to evaluate the derived transpiration fraction of CWU and to examine the relationship of nTE to Δ.

See more from this Division: ASA Section: Climatology and Modeling
See more from this Session: Honoring the Contributions of Laj Ahuja: Building Bridges Among Disciplines By Synthesizing and Quantifying Soil and Plant Processes for Whole Systems Modeling Poster