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Title
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Automatic high-frequency measurements of full soil greenhouse gas fluxes in a tropical forest
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Author
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Abstract
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| Measuring in situ soil fluxes of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) continuously at high frequency requires appropriate technology. We tested the combination of a commercial automated soil CO2 flux chamber system (LI-8100A) with a CH4 and N2O analyzer (Picarro G2308) in a tropical rainforest for 4 months. A chamber closure time of 2 min was sufficient for a reliable estimation of CO2 and CH4 fluxes (100% and 98.5% of fluxes were above minimum detectable flux - MDF, respectively). This closure time was generally not suitable for a reliable estimation of the low N2O fluxes in this ecosystem but was sufficient for detecting rare major peak events. A closure time of 25 min was more appropriate for reliable estimation of most N2O fluxes (85.6% of measured fluxes are above MDF +/- 0.002 nmol m(-2) s(-1)). Our study highlights the importance of adjusted closure time for each gas. |
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Language
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English
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Source (journal)
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Biogeosciences
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Publication
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2019
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ISSN
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1726-4170
1726-4189
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DOI
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10.5194/BG-16-785-2019
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Volume/pages
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16
:3
(2019)
, p. 785-796
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ISI
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000458363700002
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Full text (Publisher's DOI)
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Full text (open access)
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