کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4425713 | 1309111 | 2009 | 7 صفحه PDF | دانلود رایگان |

Nitrous oxide (N2O) 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. N2O 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 N2O emissions came from the initial growth stage, corresponding to the rewetting process in the soil. The annual N2O 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 N2O emissions by 51% in 2004 and 27% in 2005, respectively.
Journal: Environmental Pollution - Volume 157, Issue 5, May 2009, Pages 1666–1672