干旱区生态环境知识资源中心(Arid): Sub-surface drip irrigation reduced N2O emissions via inhibiting denitrification pathways in northern China

Arid

DOI	10.1016/j.apsoil.2023.105057
	Sub-surface drip irrigation reduced N2O emissions via inhibiting denitrification pathways in northern China
	Liang, Qing; Liu, Yang; Zhang, Haowen; Peng, Zhengping; Zhang, Xin
通讯作者	Zhang, X
来源期刊	APPLIED SOIL ECOLOGY
ISSN	0929-1393
EISSN	1873-0272
出版年	2023
卷号	191
英文摘要	Water-saving irrigation has become an important method for alleviating water scarcity in semi-arid regions. However, the lack of knowledge about the effects of different water-saving irrigation techniques on soil nitrogen conversion limits the understanding of the underlying mechanisms involved in soil N2O emissions. To determine the effects of different irrigation methods on N2O emissions, we conducted a two-season experiment under four different irrigation methods (DI, surface drip irrigation; SDI, sub-surface drip irrigation; PRI, partial rootzone irrigation; FP, flood irrigation). Also, we studied the dynamics of nitrifier and denitrifier community structures and compositions and their associations and effects on N2O emissions. The results showed that seasonal N2O emissions were affected by irrigation practices and significantly correlated with the amount of irrigation and soil moisture. Drip irrigation significantly reduced N2O emissions, with 38-45 % (DI), 51-59 % (SDI), and 64-68 % (PRI) decreases compared to FP treatment. Under SDI, the copy numbers of ammonia-oxidizing archaea amoA significantly decreased and nirK displayed an increase compared to FP. The abundance of unclassified_Proteo-bacteria dominant among nirK-type denitrifiers under FP was observed to be strongly and positively correlated with N2O emissions, and the dominant bacteria shifted to Bosea under drip irrigation. Irrigation practices had a strong effect on the Shannon and ACE indexes of five key genes. PRI showed a similar effect under SDI treatment on nitrifier and denitrifier community structures. Furthermore, PRI, with only a 38 % reduction of irrigation water consumption, produced a 4.4-11.3 % lower yield than SDI. Therefore, SDI treatment can inhibit the denitrification process led by nirS-type denitrifiers and reduce the abundance of the dominant genus of nirK and promote nosZ abundance, thus decreasing N2O emissions. Our findings indicate that (i) drip irrigation increased ammonia-oxidizing bacteria amoA abundance and diversity but decreased nirS abundance, which led to N2O mitigation and (ii) SDI might be the best method for maintaining high crop yield with lower N2O emissions in intensively farmed fields.
英文关键词	Water-saving irrigation Community structure N-related functional genes Nitrification and denitrification Wheat yield
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001043825500001
WOS关键词	AMMONIA-OXIDIZING ARCHAEA ; NITROUS-OXIDE EMISSIONS ; BACTERIAL COMMUNITIES ; DENITRIFYING BACTERIA ; CROPPING SYSTEMS ; CALCAREOUS SOIL ; USE EFFICIENCY ; NO EMISSIONS ; FERTIGATION ; ABUNDANCE
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/395386
推荐引用方式 GB/T 7714	Liang, Qing,Liu, Yang,Zhang, Haowen,et al. Sub-surface drip irrigation reduced N2O emissions via inhibiting denitrification pathways in northern China[J],2023,191.
APA	Liang, Qing,Liu, Yang,Zhang, Haowen,Peng, Zhengping,&Zhang, Xin.(2023).Sub-surface drip irrigation reduced N2O emissions via inhibiting denitrification pathways in northern China.APPLIED SOIL ECOLOGY,191.
MLA	Liang, Qing,et al."Sub-surface drip irrigation reduced N2O emissions via inhibiting denitrification pathways in northern China".APPLIED SOIL ECOLOGY 191(2023).