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Open Access Publications from the University of California

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.

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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