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

Gut, A., van Dijk, S. M., Scheibe, M., Rummel, U., Welling, M., Ammann, C., et al. (2002). NO emission from an Amazonian rain forest soil: Continuous measurements of NO flux and soil concentration. Journal of Geophysical Research, 107(D20): 8057. doi:10.1029/2001JD000521.

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Genre: Journal Article
Alternative Title : J. Geophys. Res.

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 Creators:
Gut, A.1, Author              
van Dijk, S. M.1, Author              
Scheibe, M., Author
Rummel, U.1, Author              
Welling, M.1, Author              
Ammann, C.1, Author              
Meixner, F. X.1, Author              
Kirkman, G. A.1, Author              
Andreae, M. O.1, Author              
Lehmann, B. E., Author
Affiliations:
1Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826286              

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Free keywords: nitric oxide; biogenic emission; soil concentration; flux techniques; rainforest; Amazonia
 Abstract: The net nitric oxide (NO) flux from the soil of a tropical rain forest site in Reserva Biologica Jaru (Rondonia, 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 (<10 mm) had no significant influence on the 24- hour mean net NO flux. Following larger amounts of rain, a 40% reduction of the 24-hour mean net NO flux up to a 150% increase was observed. During the September-November experiment the soil NO concentration and the soil NO bulk diffusion coefficient were measured to calculate the net NO flux using an indirect method. The soil NO concentration was continuously measured at 0.03-m depth. It ranged from 20 to 460 ppb and was positively correlated with soil moisture and soil temperature. The soil bulk diffusion coefficient determined from Rn-222 flux and soil-air activity gradient measurements ranged from 2.7 x 10(- 7) to 9.1 x 10(-7) m(-2) 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).

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Language(s): eng - English
 Dates: 2002-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 18186
ISI: 000180466200014
DOI: 10.1029/2001JD000521
 Degree: -

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Title: Journal of Geophysical Research
  Alternative Title : J. Geophys. Res.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 107 (D20) Sequence Number: 8057 Start / End Page: - Identifier: ISSN: 0747-7309