title: Nitrous oxide emissions from an intensively managed greenhouse vegetable cropping system in Northern China.
abstract: Nitrous oxide (N(2)O) emissions from a typical greenhouse vegetable system in Northern China were measured from February 2004 to January 2006 using a close chamber method. Four nitrogen management levels (NN, MN, CN, and SN) were used. N(2)O emissions occurred intermittently in the growing season, strongly correlating with N fertilization and irrigation. No peak emissions were observed after fertilization in the late Autumn season due to low soil temperature. 57-94% of the seasonal N(2)O emissions came from the initial growth stage, corresponding to the rewetting process in the soil. The annual N(2)O emissions ranged from 2.6 to 8.8 kg N ha(-1) yr(-1), accounting for 0.27-0.30% of the annual nitrogen input. Compared with conventional N management, site-specific N management reduced N fertilization rate by 69% in 2004 and by 76% in 2005, and consequently reduced N(2)O emissions by 51% in 2004 and 27% in 2005, respectively.
authors.affiliation: Key Laboratory of Plant-soil Interactions of Ministry of Education, Key Laboratory of Plant Nutrition of Minstry of Agriculture, College of Resources and Environmental Sciences, China Agricultural University, Haidian District, Beijing 100193, China.
authors.forename: Feifei
authors.initials: F
authors.lastname: He
authors.forename: Rongfeng
authors.initials: R
authors.lastname: Jiang
authors.forename: Qing
authors.initials: Q
authors.lastname: Chen
authors.forename: Fusuo
authors.initials: F
authors.lastname: Zhang
authors.forename: Fang
authors.initials: F
authors.lastname: Su
mesh_terms: D000383:Agriculture / Q000379:methods*; D000393:Air Pollutants / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring / Q000379:methods; D005308:Fertilizers; D009584:Nitrogen; D009609:Nitrous Oxide / Q000032:analysis*; D012621:Seasons; D012987:Soil / Q000032:analysis; D013696:Temperature; D014675:Vegetables; D014835:Volatilization; D014867:Water
chemical_list: D000393:Air Pollutants; D005308:Fertilizers; D012987:Soil; D014867:Water; D009609:Nitrous Oxide; D009584:Nitrogen