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Evaluating the carbon balance estimate from an automated ground-level flux chamber system in artificial grass mesocosms

Heinemeyer, A.; Gornall, J.; Baxter, R.; Huntley, B.; Ineson, P.

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Authors

A. Heinemeyer

J. Gornall

P. Ineson



Abstract

Measuring and modeling carbon (C) stock changes in terrestrial ecosystems are pivotal in addressing global C-cycling model uncertainties. Difficulties in detecting small short-term changes in relatively large C stocks require the development of robust sensitive flux measurement techniques. Net ecosystem exchange (NEE) ground-level chambers are increasingly used to assess C dynamics in low vegetation ecosystems but, to date, have lacked formal rigorous field validation against measured C stock changes. We developed and deployed an automated and multiplexed C-flux chamber system in grassland mesocosms in order rigorously to compare ecosystem total C budget obtained using hourly C-flux measurements versus destructive net C balance. The system combines transparent NEE and opaque respiration chambers enabling partitioning of photosynthetic and respiratory fluxes. The C-balance comparison showed good agreement between the two methods, but only after NEE fluxes were corrected for light reductions due to chamber presence. The dark chamber fluxes allowed assessing temperature sensitivity of ecosystem respiration (Reco) components (i.e., heterotrophic vs. autotrophic) at different growth stages. We propose that such automated flux chamber systems can provide an accurate C balance, also enabling pivotal partitioning of the different C-flux components (e.g., photosynthesis and respiration) suitable for model evaluation and developments.

Citation

Heinemeyer, A., Gornall, J., Baxter, R., Huntley, B., & Ineson, P. (2013). Evaluating the carbon balance estimate from an automated ground-level flux chamber system in artificial grass mesocosms. Ecology and Evolution, 3(15), 4998-5010. https://doi.org/10.1002/ece3.879

Journal Article Type Article
Publication Date Dec 1, 2013
Deposit Date May 19, 2014
Publicly Available Date Jun 6, 2014
Journal Ecology and Evolution
Publisher Wiley Open Access
Peer Reviewed Peer Reviewed
Volume 3
Issue 15
Pages 4998-5010
DOI https://doi.org/10.1002/ece3.879
Keywords Carbon balance, Carbon fluxes, Flux chamber, Net ecosystem exchange, Temperature response, Validation.

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Copyright Statement
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.







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