Degassing of soil solution as soil water enters springs and streams may be a significant pathway of N 2 O release into the atmosphere. A simple method is presented to sample soil solution to include gases dissolved in solution. Small porous cup lysimeters connected to narrow diameter nylon tubing were flushed with N 2 gas; a vacuum was applied with an evacuated serum bottle; and solution and gases were captured in the bottle. Concentrations of N 2 O in soil solution of a grassland in central California varied from below ambient to 13 times ambient. At a wet riparian zone site, N 2 O in soil solution appeared to be related to NO ‐ 3 concentration, which can be determined from the same soil solution sample.
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Davidson et al. (1988) studied this question.
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