Characterization of biogenic nitric oxide source strength in the southeast United States

摘要: Emissions of nitric oxide (NO) were measured during the summer 1995 from 4 crops, located at three different sites throughout North Carolina. These chosen to represent major physiographic regions Southeast US, in an effort compare fluxes agriculturally managed soils. Emission rates determined using a dynamic flow-through chamber system. In order understand NO flux soil and crop types, measurements made on corn soybean crops coastal region, tobacco Piedmont upper region Average 5.5 f 2.2 ng N me2 s-‘, 20.7 + 19.2 4.1 1.4 m-2s-1, 8.5 2 4.9 s-l respectively for region. We only able detect exponential dependence temperature two locations. Tbe composite data all research revealed general trend increasing with water content or extractable nitrogen soil, however, day variations within each site did not reveal same trends. feel that acquisition set this fashion, which consists observations collected over points both space time, makes attempts model terms parameters difficult.