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

  • Author(s): Alice Courtois, E
  • Stahl, C
  • Burban, B
  • Van Den Berge, J
  • Berveiller, D
  • Bréchet, L
  • Larned Soong, J
  • Arriga, N
  • Peñuelas, J
  • August Janssens, I
  • et al.
Abstract

Measuring in situ soil fluxes of carbon dioxide (CO ), methane (CH ), and nitrous oxide (N O) continuously at high frequency requires appropriate technology. We tested the combination of a commercial automated soil CO flux chamber system (LI-8100A) with a CH and N O analyzer (Picarro G2308) in a tropical rainforest for 4 months. A chamber closure time of 2 min was sufficient for a reliable estimation of CO and CH 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 N O 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 N O fluxes (85.6% of measured fluxes are above MDF±0.002 nmolm s ). Our study highlights the importance of adjusted closure time for each gas. 2 4 2 2 4 2 2 4 2 2 -2 -1

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