一氧化二氮
温室气体
环境科学
人类受精
灌溉
生长季节
农学
温室
氮气
种植
种植制度
动物科学
化学
农业
生态学
生物
作物
有机化学
作者
Fangliang He,Rongfeng Jiang,Qing Chen,Fusuo Zhang,Fang Su
标识
DOI:10.1016/j.envpol.2008.12.017
摘要
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.
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