干旱区生态环境知识资源中心(Arid): Presence of spring-thaw N2O emissions are not linked to functional gene abundance in a drip-fertigated cropped soil in arid northwestern China

Arid

DOI	10.1016/j.scitotenv.2019.133670
	Presence of spring-thaw N2O emissions are not linked to functional gene abundance in a drip-fertigated cropped soil in arid northwestern China
	Yin, Mingyuan 1,2,3; Gao, Xiaopeng 1,2,4; Tenuta, Mario 1,4; Gui, Dongwei 1,2; Zeng, Fanjiang1,2
通讯作者	Gao, Xiaopeng
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2019
卷号	695
英文摘要	Spring-thaw represents a significant source for nitrous oxide (N2O) emissions from fertilized croplands in temperate regions. In this study, we present surface N2O fluxes, soil-profile N2O concentrations at 5, 15, 30 and 60 cm depths along with the abundance of nitrifiers and denitrifiers over the winter and spring-thaw periods in an arid, drip-fertigatecl cotton field, which had received spring application of 240 kg N ha(-1) as urea alone (Urea), polymer-coated urea (ESN), and urea plus urease and nitrification inhibitors. Nitrous oxide emissions from December to April were generally unaffected by fertilizer treatments with a cumulative average of 186 g N ha m, accounting for 39% of the annual N2O emissions. Emission peaks occurred at spring-thaw and coincided with increasing soil-profile N2O concentrations at all depths, suggesting the burst in N2O fluxes was due to new N2O production, rather than a physical release of N2O trapped in the soil profiles over winter. The abundance of nitrifier and denitrifier genes changed over the winter and spring-thaw periods but was not affected by fertilizer treatments from the previous spring, suggesting the abundance of N2O-producing microorganism was more controlled by environmental conditions than N sources applied in the previous spring. The daily N20 flux rate from December to April was positively correlated with soil temperature, water-filled pore space, and denitrifying enzyme activity, but not with the gene copy number of AOA, AOB, narG, nirK and nosZ, indicating that variation in the abundance of these genes was not contributing to the N2O emissions. These results suggest that N2O emissions in spring-thaw are substantial for drip-fertigated croplands in the arid regions and should be considered in the annual budgets. The environmental factors such as soil temperature and moisture are likely more important than the copy-numbers of N2O-producing functional genes in driving the variability in spring-thaw emissions. (C) 2019 Elsevier BM. All rights reserved.
英文关键词	Denitrifying enzyme activity Denitrifiers Drip-fertigation Nitrifiers Profile N2O concentration Spring-thaw
类型	Article
语种	英语
国家	Peoples R China ; Canada
收录类别	SCI-E
WOS记录号	WOS:000496802200008
WOS关键词	NITROUS-OXIDE EMISSIONS ; DENITRIFYING BACTERIA ; EXTRACTION METHOD ; PCR PRIMERS ; NOSZ GENES ; DENITRIFICATION ; FREEZE ; WINTER ; MANAGEMENT ; DIVERSITY
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
EI主题词	2019-12-10
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311666
作者单位	1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Peoples R China; 2.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Cele Natl Stn Observat & Res Desert Grassland Eco, Cele 848300, Peoples R China; 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China; 4.Univ Manitoba, Dept Soil Sci, Winnipeg, MB R3T 2N2, Canada
推荐引用方式 GB/T 7714	Yin, Mingyuan,Gao, Xiaopeng,Tenuta, Mario,et al. Presence of spring-thaw N2O emissions are not linked to functional gene abundance in a drip-fertigated cropped soil in arid northwestern China[J]. 中国科学院新疆生态与地理研究所,2019,695.
APA	Yin, Mingyuan,Gao, Xiaopeng,Tenuta, Mario,Gui, Dongwei,&Zeng, Fanjiang.(2019).Presence of spring-thaw N2O emissions are not linked to functional gene abundance in a drip-fertigated cropped soil in arid northwestern China.SCIENCE OF THE TOTAL ENVIRONMENT,695.
MLA	Yin, Mingyuan,et al."Presence of spring-thaw N2O emissions are not linked to functional gene abundance in a drip-fertigated cropped soil in arid northwestern China".SCIENCE OF THE TOTAL ENVIRONMENT 695(2019).