Nitrous oxide emissions from a commercial cornfield (Zea mays) measured using the eddy covariance technique
Item
Title (Dublin Core)
Nitrous oxide emissions from a commercial cornfield (Zea mays) measured using the eddy covariance technique
Description (Dublin Core)
Increases in observed atmospheric concentrations of the long-lived greenhouse gas nitrous oxide (N<sub>2</sub>O) have been well documented. However, information on event-related instantaneous emissions during fertilizer applications is lacking. With the development of fast-response N<sub>2</sub>O analyzers, the eddy covariance (EC) technique can be used to gather instantaneous measurements of N<sub>2</sub>O concentrations to quantify the exchange of nitrogen between the soil and atmosphere. The objectives of this study were to evaluate the performance of a new EC system, to measure the N<sub>2</sub>O flux with the system, and finally to examine relationships of the N<sub>2</sub>O flux with soil temperature, soil moisture, precipitation, and fertilization events. An EC system was assembled with a sonic anemometer and a fast-response N<sub>2</sub>O analyzer (quantum cascade laser spectrometer) and applied in a cornfield in Nolensville, Tennessee during the 2012 corn growing season (4 April–8 August). Fertilizer amounts totaling 217 kg N ha<sup>−1</sup> were applied to the experimental site. Results showed that this N<sub>2</sub>O EC system provided reliable N<sub>2</sub>O flux measurements. The cumulative emitted N<sub>2</sub>O amount for the entire growing season was 6.87 kg N<sub>2</sub>O-N ha<sup>−1</sup>. Seasonal fluxes were highly dependent on soil moisture rather than soil temperature. This study was one of the few experiments that continuously measured instantaneous, high-frequency N<sub>2</sub>O emissions in crop fields over a growing season of more than 100 days.
Creator (Dublin Core)
Huang, H.
Wang, J.
Hui, D.
Miller, D. R.
Bhattarai, S.
Dennis, S.
Smart, D.
Sammis, T.
Reddy, K. C.
Date (Dublin Core)
2018-09-08
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-14-12839-2014
https://acp.copernicus.org/articles/14/12839/2014/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
