Two automatic chamber techniques for measuring soil-atmosphere exchanges of trace gases and results of their use in the OASIS field experiment

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Two techniques for measuring soil/plant/atmosphere exchange fluxes of stable trace gases are presented. The first technique involves an automatic chamber capable of running at remote, unpowered, unattended sites. The air samples collected from individual flux measurements are progressively added to holding volumes, essentially averaging the concentrations in the accumulated air samples before their chemical analysis. This technique allows the continuous measurement of trace gas exchange at multiple distant remote sites to be carried out by one or two persons operating from a central laboratory housing the analytical facilities ...