NO emission from an Amazonian rain forest soil: Continuous measurements of NO flux and soil concentration

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Abstract
The net nitric oxide (NO) flux from the soil of a tropical rain forest site in Reserva Biologica Jaru (Rondônia, Brazil) was continuously measured in May and during September–November 1999 using dynamic chambers. The median net NO flux was 4.7 ng N m−2 s−1 in May (1000 individual measurements) and 4.0 ng N m−2 s−1 in September–November (4200 individual measurements). The daily variation of the net NO flux was positively correlated to the daily variations of soil temperature. Minor rain events (222Rn flux and soil‐air activity gradient measurements ranged from 2.7 × 10−7 to 9.1 × 10−7 m2 s−1 and was parameterized with soil air‐filled pore space. The median net NO flux calculated by the indirect method was 3.9 ng N m−2 s−1 (1600 individual measurements).