Automatic high-frequency measurements of full soil greenhouse gas fluxes in a tropical forest
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Automatic high-frequency measurements of full soil greenhouse gas fluxes in a tropical forest

  • Author(s): Courtois, Elodie Alice
  • Stahl, Clément
  • Burban, Benoit
  • Van den Berge, Joke
  • Berveiller, Daniel
  • Bréchet, Laëtitia
  • Soong, Jennifer Larned
  • Arriga, Nicola
  • Peñuelas, Josep
  • Janssens, Ivan August
  • et al.
Abstract

Abstract. 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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