title: Nitrous oxide emission mechanisms during intermittently aerated composting of cattle manure.
abstract: To investigate the mechanisms of nitrous oxide (N₂O) emission during intermittent aeration in the composting process, a laboratory scale experiment with continuous measurement of N₂O emission was conducted with cattle manure. A low oxygen mode (2.5% oxygen in the inlet for 1 day), anaerobic mode (0.13% oxygen for 0.25 day), and aerated mode (20.5% oxygen for 2 days) were sequentially set up three times after 22 days of continuous aeration to replicate intermittent aeration. The total N₂O emission was 0.26-0.35 mmol, 0.27-0.32 mmol, and 0.14-0.23 mmol during the low oxygen, anaerobic, and aerated modes, respectively. Denitrification was indicated as the main N₂O emission pathway in the anaerobic and low-oxygen modes, while nitrification was indicated as the main pathway in the aerated mode and under continuous aeration. Results from this study suggest that nitrification is an important pathway for N₂O emission as well as denitrification.
authors.affiliation: Research and Education Faculty, Natural Sciences Cluster, Agriculture Unit, Kochi University, B200 Monobe, Nankoku, Kochi, Japan. jm-tsutsuih@kochi-u.ac.jp
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Tsutsui
authors.forename: Taku
authors.initials: T
authors.lastname: Fujiwara
authors.forename: Kazutsugu
authors.initials: K
authors.lastname: Matsukawa
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Funamizu
mesh_terms: D000818:Animals; D002417:Cattle; D008372:Manure; D009585:Nitrogen Dioxide / Q000032:analysis / Q000737:chemistry; D009609:Nitrous Oxide / Q000032:analysis / Q000737:chemistry*; D012987:Soil; D018505:Waste Management / Q000379:methods
chemical_list: D008372:Manure; D012987:Soil; D009609:Nitrous Oxide; D009585:Nitrogen Dioxide