Eddy covariance captures four-phase crassulacean acid metabolism (CAM) gas exchange signature in Agave.
Owen, Nick A
Choncubhair, Órlaith Ní
Del Real Laborde, José Ignacio
Plant Cell Environ
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Owen, N. A., Choncubhair, Ó. N., Males, J., Del Real Laborde, J. I., Rubio-Cortés, R., Griffiths, H., & Lanigan, G. (2016). Eddy covariance captures four-phase crassulacean acid metabolism (CAM) gas exchange signature in Agave.. Plant Cell Environ, 39 (2), 295-309. https://doi.org/10.1111/pce.12610
Mass and energy fluxes were measured over a field of Agave tequilana in Mexico using eddy covariance (EC) methodology. Data were gathered over 252 d, including the transition from wet to dry periods. Net ecosystem exchanges (FN,EC ) displayed a crassulacean acid metabolism (CAM) rhythm that alternated from CO2 sink at night to CO2 source during the day, and partitioned canopy fluxes (FA,EC ) showed a characteristic four-phase CO2 exchange pattern. Results were cross-validated against diel changes in titratable acidity, leaf-unfurling rates, energy exchange fluxes and reported biomass yields. Projected carbon balance (g C m(-2) year(-1) , mean ± 95% confidence interval) indicated the site was a net sink of -333 ± 24, of which contributions from soil respiration were +692 ± 7, and FA,EC was -1025 ± 25. EC estimated biomass yield was 20.1 Mg (dry) ha(-1) year(-1) . Average integrated daily FA,EC was -234 ± 5 mmol CO2 m(-2) d(-1) and persisted almost unchanged after 70 d of drought conditions. Regression analyses were performed on the EC data to identify the best environmental predictors of FA . Results suggest that the carbon acquisition strategy of Agave offers productivity and drought resilience advantages over conventional semi-arid C3 and C4 bioenergy candidates.
Agave tequilana, CAM, bioenergy, biomass, climate change adaptation, crassulacean acid metabolism, ecophysiology, eddy covariance, eddy flux, renewable energy, Acids, Agave, Biomass, Carbon, Carbon Dioxide, Ecosystem, Gases, Models, Biological, Plant Leaves, Regression Analysis, Reproducibility of Results, Respiration, Soil, Spectrum Analysis, Thermodynamics, Water
RIRDC (Australia) for funding the experiment
External DOI: https://doi.org/10.1111/pce.12610
This record's URL: https://www.repository.cam.ac.uk/handle/1810/295433