Productivity and CO2 exchange of the leguminous crops: Estimates from flux-tower measurements
Tagir G. Gilmanov
(1)
,
John M. Baker
(2)
,
Carl J. Bernacchi
(3)
,
David P. Billesbach
(4)
,
George G. Burba
(5)
,
Saulo Castro
(6, 7)
,
Jiquan Chen
(8)
,
Werner Eugster
(9)
,
Marc L. Fischer
(10)
,
John A. Gamon
(11)
,
Maheteme Gebremedhin
(12)
,
Aaron J. Glenn
(13)
,
Timothy J. Griffis
(14)
,
Jerry L. Hatfield
(15)
,
Mark W. Heuer
(16)
,
Daniel M. Howard
(17)
,
Monique Y. Leclerc
(18)
,
Henry W. Loescher
(19, 20)
,
Olivier Marloie
(21)
,
Tilden P. Meyers
(16)
,
Albert Olioso
(22)
,
Rebecca L. Phillips
(23)
,
John H. Prueger
(24)
,
R. Howard Skinner
(3)
,
Andrew E. Suyker
(25)
,
Mario Tenuta
(26)
,
Bruce K. Wylie
(27)
1
SDSTATE -
South Dakota State University
2 Soil & water management unit
3 United States Department of Agriculture
4 Biological systems engineering department
5 LI-COR Biosciences
6 Department of Biological Sciences [Edmonton]
7 Department of Earth and Atmospheric Sciences [Edmonton]
8 University of Toledo
9 ETH Zürich - Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich]
10 Energy and Environment Technologies Division [LBNL Berkeley]
11 Departments of earth & atmospheric sciences and biological sciences
12 Science and engineering alliance
13 Science and technolohy branch
14 Department soil, water & climate
15 National laboratory for agriculture and the environment
16 ATD - ARL Atmospheric Turbulence and Diffusion Division
17 SGT - Stinger Ghaffarian Technologies
18 Laboratory for environmental physics
19 NEON - National Ecological Observatory Network, Science Office
20 INSTAAR - Institute of Arctic Alpine Research [University of Colorado Boulder]
21 URFM - Unité de Recherches Forestières Méditerranéennes
22 EMMAH - Environnement Méditerranéen et Modélisation des Agro-Hydrosystèmes
23 Land care research
24 National laboratory for agricuture and the environment
25 School of natural resources
26 Department of soil science
27 EROS - Center for Earth Resources Observation and Science
2 Soil & water management unit
3 United States Department of Agriculture
4 Biological systems engineering department
5 LI-COR Biosciences
6 Department of Biological Sciences [Edmonton]
7 Department of Earth and Atmospheric Sciences [Edmonton]
8 University of Toledo
9 ETH Zürich - Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich]
10 Energy and Environment Technologies Division [LBNL Berkeley]
11 Departments of earth & atmospheric sciences and biological sciences
12 Science and engineering alliance
13 Science and technolohy branch
14 Department soil, water & climate
15 National laboratory for agriculture and the environment
16 ATD - ARL Atmospheric Turbulence and Diffusion Division
17 SGT - Stinger Ghaffarian Technologies
18 Laboratory for environmental physics
19 NEON - National Ecological Observatory Network, Science Office
20 INSTAAR - Institute of Arctic Alpine Research [University of Colorado Boulder]
21 URFM - Unité de Recherches Forestières Méditerranéennes
22 EMMAH - Environnement Méditerranéen et Modélisation des Agro-Hydrosystèmes
23 Land care research
24 National laboratory for agricuture and the environment
25 School of natural resources
26 Department of soil science
27 EROS - Center for Earth Resources Observation and Science
Olivier Marloie
- Fonction : Auteur
- PersonId : 1204394
- IdHAL : marloie-olivier
- ORCID : 0009-0001-9930-7111
Albert Olioso
- Fonction : Auteur
- PersonId : 747885
- IdHAL : albert-olioso
- ORCID : 0000-0001-8342-9272
- IdRef : 133862283
Résumé
Net CO2 exchange data of legume crops at 17 flux tower sites in North America and 3 sites in Europe representing 29 site-years of measurements were partitioned into gross photosynthesis and ecosystem respiration by using nonrectangular hyperbolic light-response function method. The analyses produced net CO2 exchange data and new ecosystem-scale ecophysiological parameter estimates for of legume crops determined at the 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 for maize, but higher than for wheat 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 average of –330 g CO2 m-2 yr-1, indicating overall moderate CO2-source activity related to shorter period of photosynthetic uptake and metabolic costs of nitrogen fixation. Perennial legumes (alfalfa) were strong sinks for atmospheric CO2 with average NEP of +980 (range 550 to 1200) g CO2 m-2 yr-1