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          Institute: MPI für Chemie     Collection: Publikationen MPI für Chemie     Display Documents



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ID: 18292.0, MPI für Chemie / Publikationen MPI für Chemie
Biogenic NO emissions from forest and pasture soils: Relating laboratory studies to field measurements
Authors:van Dijk, S. M.; Gut, A.; Kirkman, G. A.; Meixner, F. X.; Andreae, M. O.; Gomes, B. M.
Language:English
Date of Publication (YYYY-MM-DD):2002-09
Title of Journal:Journal of Geophysical Research
Journal Abbrev.:J. Geophys. Res.
Volume:107
Issue / Number:D20
Sequence Number of Article:8058
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:During September and October 1999, dynamic chamber measurements were carried out to determine nitric oxide (NO) fluxes from a primary forest soil and an old pasture in the Brazilian Amazon basin as part of the project "European Studies of Trace Gases and Atmospheric Chemistry as a Contribution to the Large-Scale Biosphere-Atmosphere Experiment in Amazonia" (LBA-EUSTACH). In addition, soil samples were collected from these two sites, and laboratory experiments were conducted to determine the NO production and consumption rate constants as functions of soil temperature and soil moisture. These laboratory results were converted into NO fluxes using a simple algorithm, which required additional information on the gas diffusion in soil, the soil bulk density, and the field conditions (soil temperature and soil moisture). Over the entire measurement period, the calculated and measured NO fluxes agreed well both for the forest (6.9 +/- 2.9 and 5.0 +/- 4.6 ng m(-2) s(-1), respectively) and for the pasture (0.67 +/- 0.09 and 0.65 +/- 0.37 ng m(-2) s(-1), respectively). Forest to pasture conversion decreased NO production and gas diffusion and resulted in smaller NO fluxes from pasture than forest soil.
Free Keywords:nitric oxide; biogenic emission; biosphere-atmosphere exchange; rainforest; pasture; Amazonia
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Chemie/Biogeochemie
External Affiliations:Fed Univ Rondonia, BR-9876000 Jiparana, Rondonia, Brazil
Identifiers:ISI:000180466200015
ISSN:0747-7309
DOI:10.1029/2001JD000358
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