Productivity and carbon dioxide exchange of leguminous crops: estimates from flux tower measurements

Tagir G. Gilmanov; John M. Baker; Carl J. Bernacchi; David P. Billesbach; George G. Burba; Saulo Castro; Jiquan Chen; Werner Eugster; Marc L. Fischer; John A. Gamon; Maheteme T. Gebremedhin; Aaron J. Glenn; Timothy J. Griffis; Jerry L. Hatfield; Mark W. Heuer; Daniel M. Howard; Monique Y. Leclerc; Henry W. Loescher; Oliver Marloie; Tilden P. Meyers; Albert Olioso; Rebecca L. Phillips; John H. Prueger; R. Howard Skinner; Andrew E. Suyker; Mario Tenuta; Bruce K. Wylie

doi:10.2134/agronj2013.0270

Productivity and carbon dioxide exchange of leguminous crops: estimates from flux tower measurements

Agronomy Journal

By: Tagir G. Gilmanov, John M. Baker, Carl J. Bernacchi, David P. Billesbach, George G. Burba, Saulo Castro, Jiquan Chen, Werner Eugster, Marc L. Fischer, John A. Gamon, Maheteme T. Gebremedhin, Aaron J. Glenn, Timothy J. Griffis, Jerry L. Hatfield, Mark W. Heuer, Daniel M. Howard, Monique Y. Leclerc, Henry W. Loescher, Oliver Marloie, Tilden P. Meyers, Albert Olioso, Rebecca L. Phillips, John H. Prueger, R. Howard Skinner, Andrew E. Suyker, Mario Tenuta, and Bruce K. Wylie

https://doi.org/10.2134/agronj2013.0270

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Abstract

Net CO₂ exchange data of legume crops at 17 flux tower sites in North America and three sites in Europe representing 29 site-years of measurements were partitioned into gross photosynthesis and ecosystem respiration by using the nonrectangular hyperbolic light-response function method. The analyses produced net CO₂ exchange data and new ecosystem-scale ecophysiological parameter estimates for legume crops determined at diurnal and weekly time steps. Dynamics and annual totals of gross photosynthesis, ecosystem respiration, and net ecosystem production were calculated by gap filling with multivariate nonlinear regression. Comparison with the data from grain crops obtained with the same method demonstrated that CO₂ exchange rates and ecophysiological parameters of legumes were lower than those of maize (Zea mays L.) but higher than for wheat (Triticum aestivum L.) crops. Year-round annual legume crops demonstrated a broad range of net ecosystem production, from sinks of 760 g CO₂ m^–2 yr^–1 to sources of –2100 g CO₂ m^–2 yr^–1, with an average of –330 g CO₂ m^–2 yr^–1, indicating overall moderate CO₂–source activity related to a shorter period of photosynthetic uptake and metabolic costs of N₂ fixation. Perennial legumes (alfalfa, Medicago sativa L.) were strong sinks for atmospheric CO₂, with an average net ecosystem production of 980 (range 550–1200) g CO₂ m^–2 yr^–1.

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Additional publication details
Publication type	Article
Publication Subtype	Journal Article
Title	Productivity and carbon dioxide exchange of leguminous crops: estimates from flux tower measurements
Series title	Agronomy Journal
DOI	10.2134/agronj2013.0270
Volume	106
Issue	2
Year Published	2014
Language	English
Publisher	American Society of Agronomy
Publisher location	Madison, WI
Contributing office(s)	Earth Resources Observation and Science (EROS) Center
Description	15 p.
First page	545
Last page	559
Country	Canada, United States
Online Only (Y/N)	N
Additional Online Files (Y/N)	N
Google Analytic Metrics	Metrics page