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ENVIRONMENTAL EnvironmentalPollution102,Sl(l998) 211-218

EnvironmentalPollution102,Sl(l998) 211-218
Characterization of biogenic nitric oxide source strength in the
southeast United States
Viney P. Aneja*, Paul A. Roelle and Wayne P. Robarge
North Carolina State University,Raleigh, NC 27695-8208, USA
Emissions of nitric oxide (NO) were measured during the summer of 1995 from 4 crops, located at three different sites throughout
North Carolina. These siteswere chosen to represent major physiographicregionsof the Southeast US, in an effort to compare fluxes
from different agriculturally managed soils.Emission rates were determined usinga dynamicflow-through chamber system.In order
to understand the NO fluxfrom the different soiland crop types,measurements were made on corn and soybean crops in the coastal
region, tobacco in the Piedmont region, and corn in the upper Piedmont region of North Carolina. Average NO fluxeswere 5.5 f 2.2
ng N me2s-`,20.7 + 19.2ng N me2s-`,4.1 + 1.4ng N m-2s-1,and 8.5 2 4.9ng N me2s-l respectively for corn and soybean inthe coastal
region, tobacco in the Piedmont region, and corn in the upper Piedmont region. We were only able to detect an exponential
dependence of NO flux on soil temperature at two of the locations. Tbe composite data of all the research sites revealed a general
trend of increasing NO fluxwith soilwater content or increasing extractable nitrogen in the soil, however, the day to day variations
within each site did not reveal the same trends. We feel that acquisition of a soil NO flux data set in this fashion, whichconsistsof
observations collected over different points in both space and time, makes attempts to model soil NO flux in terms of different soil


Source: Aneja, Viney P. - Department of Marine, Earth and Atmospheric Sciences, North Carolina State University


Collections: Environmental Sciences and Ecology; Geosciences