Ammonia oxidation pathways and nitrifier denitrification are significant sources of N2O and NO under low oxygen availability

	Ammonia oxidation pathways and nitrifier denitrification are significant sources of N2O and NO under low oxygen availability
	Zhu, Xia ; Burger, Martin ; Doane, Timothy A. ; Horwath, William R.
刊名	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
	2013
卷号	110 期号:16 页码:6328-6333
ISSN号	0027-8424
通讯作者	Zhu, X (reprint author), Chinese Acad Sci, Chengdu Inst Biol, Ctr Ecol Studies, Chengdu 610041, Peoples R China ; Burger, Martin ; Horwath, William R.
产权排序	1
英文摘要	The continuous increase of nitrous oxide (N2O) abundance in the atmosphere is a global concern. Multiple pathways of N2O production occur in soil, but their significance and dependence on oxygen (O-2) availability and nitrogen (N) fertilizer source are poorly understood. We examined N2O and nitric oxide (NO) production under 21%, 3%, 1%, 0.5%, and 0% (vol/vol) O-2 concentrations following urea or ammonium sulfate [(NH4)(2)SO4] additions in loam, clay loam, and sandy loam soils that also contained ample nitrate. The contribution of the ammonia (NH3) oxidation pathways (nitrifier nitrification, nitrifier denitrification, and nitrification-coupled denitrification) and heterotrophic denitrification (HD) to N2O production was determined in 36-h incubations in microcosms by N-15-O-18 isotope and NH3 oxidation inhibition (by 0.01% acetylene) methods. Nitrous oxide and NO production via NH3 oxidation pathways increased as O-2 concentrations decreased from 21% to 0.5%. At low (0.5% and 3%) O-2 concentrations, nitrifier denitrification contributed between 34% and 66%, and HD between 34% and 50% of total N2O production. Heterotrophic denitrification was responsible for all N2O production at 0% O-2. Nitrifier denitrification was the main source of N2O production from ammonical fertilizer under low O-2 concentrations with urea producing more N2O than (NH4)(2)SO4 additions. These findings challenge established thought attributing N2O emissions from soils with high water content to HD due to presumably low O-2 availability. Our results imply that management practices that increase soil aeration, e. g., reducing compaction and enhancing soil structure, together with careful selection of fertilizer sources and/or nitrification inhibitors, could decrease N2O production in agricultural soils.
学科主题	Science & Technology - Other Topics
收录类别	SCI
语种	英语
WOS记录号	WOS:000318041500030
公开日期	2014-11-21
内容类型	期刊论文
源URL	[http://210.75.237.14/handle/351003/24232]
专题	成都生物研究所_生态研究
推荐引用方式 GB/T 7714	Zhu, Xia,Burger, Martin,Doane, Timothy A.,et al. Ammonia oxidation pathways and nitrifier denitrification are significant sources of N2O and NO under low oxygen availability[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2013,110(16):6328-6333.
APA	Zhu, Xia,Burger, Martin,Doane, Timothy A.,&Horwath, William R..(2013).Ammonia oxidation pathways and nitrifier denitrification are significant sources of N2O and NO under low oxygen availability.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,110(16),6328-6333.
MLA	Zhu, Xia,et al."Ammonia oxidation pathways and nitrifier denitrification are significant sources of N2O and NO under low oxygen availability".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 110.16(2013):6328-6333.