Emissions of NO from soil at a rural site in Central Tennessee

Journal Article · Mon Sep 20 04:00:00 EDT 1993 · Journal of Geophysical Research

DOI:https://doi.org/10.1029/93JD01417· OSTI ID:83360

Valente, R J; Thornton, F C ^[1]

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1. Tennessee Valley Authority, Muscle Shoals, AL (United States)

Field measurements of soil emissions of NO from a Mountview silt loam soil with three land uses (forest, fertilized pasture, and fertilized corn) were made on a commercial farm during a summer and autumn sampling period. A new automated closed-chamber sampling system was developed to allow simultaneous measurements on five chambers per 100 m{sup 2} plot. Individual chambers with hinged tops, covering 0.3 m{sup 2} of soil area were pneumatically operated via data logger control to sample soil NO flux every third hour. Spatial variability in emission rates was high. For each land use type the range from the lowest to the highest emitting chamber was approximately threefold. Land use type significantly affected soil NO emissions. The fertilized pasture had the highest mean emission rate (44.1 ng N m{sup {minus}2} s{sup {minus}1}), followed by the fertilized corn (27.0 ng N m{sup {minus}2} s{sup {minus}1}), and the forest (8.4 ng N m{sup {minus}2} s{sup {minus}1}). NO emission rates and soil nitrate levels at the forest plot were considerably higher than at other forest sites in the region, possibly due to runoff from an adjacent fertilized hayfield. The results of this study, when extrapolated to a regional estimate, suggest that emissions of NO from soils could play a significant role in summertime tropospheric ozone photochemistry in the southeastern United States. 26 refs., 9 figs., 3 tabs.

• Sponsoring Organization: USDOE
• OSTI ID: 83360
• Journal Information: Journal of Geophysical Research, Journal Name: Journal of Geophysical Research Journal Issue: D9 Vol. 98; ISSN JGREA2; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ATMOSPHERIC CHEMISTRY
EMISSION
FARMS
FORESTS
NITRIC OXIDE
NITROGEN CYCLE
PASTURES
SOILS
TENNESSEE