title: Determination of GHG and ammonia emissions from stored dairy cattle slurry by using a floating dynamic chamber.
abstract: We developed a system for measuring emissions from stored slurry by using a floating dynamic chamber. CH(4) , CO(2) , N(2) O and NH(3)  emitted from the storage tank of a dairy cattle farm in eastern Hokkaido were measured during summer 2008 (7/16-8/6), fall 2008 (10/2-10/26), spring 2009 (6/2-6/21) and winter 2009 (3/11). Average daily gas emission rates in summer, fall and spring were, respectively, 54.8, 54.2 and 34.3 g/m(2)  for CH(4) ; 602, 274 and 254 g/m(2)  for CO(2) ; 55.4, 68.2 and trace mg/m(2)  for N(2) O; and 0.55, 0.73 and 0.46 g/m(2)  for NH(3) . CH(4) , CO(2)  and NH(3)  emission rates during the brief measurement period in winter were reduced to 1/4, 1/23 and 1/2, respectively, of summer emission rate levels. All gas emissions showed diurnal fluctuation and were greatest during the daytime, when the ambient temperature rose. CH(4) , NH(3)  and CO(2)  emissions increased significantly during the daytime, and the daily emission (in grams) of each gas was positively correlated with maximum daily temperature. According to the combined spring, summer and fall measurements, the CH(4) , N(2) O and NH(3)  annual emission factors were 1.42% (g CH(4) /g volatile solids), 0.02% (g N(2) O-N/g total N) and 0.43% (g NH(3) -N/g total N), respectively.
authors: Hokkaido Research Organization, Animal Research Center, Shintoku, Hokkaido, Japan.
authors: Keiko
authors: K
authors: Minato
authors: Yasuyuki
authors: Y
authors: Kouda
authors: Masaaki
authors: M
authors: Yamakawa
authors: Satoshi
authors: S
authors: Hara
authors: Tadashi
authors: T
authors: Tamura
authors: Takashi
authors: T
authors: Osada
mesh_terms: D000397:Air Pollution / Q000032:analysis*; D000641:Ammonia / Q000032:analysis*; D000818:Animals; D002245:Carbon Dioxide / Q000032:analysis*; D002417:Cattle; D057231:Climate Change; D003612:Dairying; D004784:Environmental Monitoring / Q000379:methods*; D005740:Gases; D008372:Manure / Q000032:analysis*; D008697:Methane / Q000032:analysis*; D009609:Nitrous Oxide / Q000032:analysis*; D012621:Seasons; D013696:Temperature
chemical_list: D005740:Gases; D008372:Manure; D002245:Carbon Dioxide; D000641:Ammonia; D009609:Nitrous Oxide; D008697:Methane