Journal article
Comparison of slant open-path flux gradient and static closed chamber techniques to measure soil N2O emissions
Mei Bai, Helen Suter, Shu Kee Lam, Thomas K Flesch, Deli Chen
Atmospheric Measurement Techniques | Copernicus Publications | Published : 2019
Abstract
Improving direct field measurement techniques to quantify gas emissions from cropped agricultural fields is challenging. We compared nitrous oxide (N2O) emissions measured with static closed chambers to those from a newly developed aerodynamic flux gradient (FG) approach. Measurements were made at a vegetable farm following chicken manure application. The FG calculations were made with a single open-path Fourier transform infrared (OP-FTIR) spectrometer (height of 1.45 m) deployed in a slant-path configuration, sequentially aimed at retro reflectors at heights of 0.8 and 1.8 m above ground. Hourly emissions were measured with the FG technique, but once a day between 10:00 and 13:00 with cham..
View full abstractGrants
Funding Acknowledgements
This study was funded by the Australian Department of Agriculture (DA), and the Canadian Agricultural Greenhouse Gases Program (AGGP). The authors thank Schruers' vegetable farm, Adam Schruers and staff for their great support. The authors also thank Rohan Davies from BASF Australia Ltd. for providing assistance. We gratefully acknowledge the assistance of the staff and students from the Faculty of Veterinary and Agricultural Sciences soil research group at the University of Melbourne during this campaign. We especially thank Raphael Trouve for helping with the non-linear model analysis. The valuable comments from all reviewers were appreciated.