Nitrous oxide emissions from an intensively managed greenhouse vegetable cropping system in Northern China.
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.
He
Feifei
F
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.
Jiang
Rongfeng
R
Chen
Qing
Q
Zhang
Fusuo
F
Su
Fang
F
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
D000393:Air Pollutants; D005308:Fertilizers; D012987:Soil; D014867:Water; D009609:Nitrous Oxide; D009584:Nitrogen