期刊
AGRONOMY JOURNAL
卷 106, 期 2, 页码 545-559出版社
AMER SOC AGRONOMY
DOI: 10.2134/agronj2013.0270
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资金
- USDOE, Biological and Environmental Research, Terrestrial Carbon Program [DE-FG02-04ER63917, DE-FG02-04ER63911]
- CarboEuropeIP
- Fluxnet-Canada
- CFCAS
- NSERC
- BIOCAP
- Environment Canada
- NRCan
- Canadian Foundation for Innovation
- iCORE (Alberta Innovates Technology Futures)
- USGS Land Change Science Program
- USDA-ARS
- National Science Foundation (NSF)
- USDOE
- CARBOFRANCE project funded by the European FP7 Program [GOCECT-2003-505572]
- French Ministry in charge of Environment (GICC programme)
- USDOE, Office of Science [DE-FCO2-07ER64494]
- Office of Energy Efficiency and Renewable Energy [DE-ACO5-76RL01830]
- Energy Efficiency and Renewable Energy [DE-ACO5-76RL01830]
- NSF LTER Program [DEB 1027253]
- MSU AgBioResearch
- Direct For Biological Sciences
- Division Of Environmental Biology [1027253] Funding Source: National Science Foundation
- Div Of Biological Infrastructure
- Direct For Biological Sciences [1029808] Funding Source: National Science Foundation
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 N-2 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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