Measurement of Nitric oxide flux from intensively managed agricultural soil in the coastal plain of north carolina

摘要

Biogenic soil emissions of Nitric Oxide (NO) were measured from an intensively managed agricultural row crop (corn, Zea mays) during a four week period (May 15 through June 9, 1995), in the Loer Coastal Plain of North Carolina. Soil No flux was determined using a dynamic flow-though chamber technique. The measurement period was characterized by two distingusing features: an application of nitrogen (N) fertilizer at the midpoint of the experiment and a non-typical rainfall pattern. Average NO fulx prior to the application of N fertillizer was 31.5 +- 10.1 ng N m~(-2) s~(-1), and more than doubled (77.7 +-63.7 ng N m~(-2) s(-1)) after the application of a sidedressing of N fertilizer. No flux followed the same durnal trend as soil temperature, with maximum NO emissions coinciding with maximum soil temperature, and minimum NO emissions coinciding with minimum soil temperature.