干旱区生态环境知识资源中心(Arid): Long-term saline water drip irrigation alters soil physicochemical properties, bacterial community structure, and nitrogen transformations in cotton

Arid

DOI	10.1016/j.apsoil.2022.104719
	Long-term saline water drip irrigation alters soil physicochemical properties, bacterial community structure, and nitrogen transformations in cotton
	Guo, Xiaowen; Du, Siyao; Guo, Huijuan; Min, Wei
通讯作者	Min, W
来源期刊	APPLIED SOIL ECOLOGY
ISSN	0929-1393
EISSN	1873-0272
出版年	2023
卷号	182
英文摘要	Saline water irrigation has become important in alleviating shortages of freshwater resources in arid areas. However, long-term saline irrigation increases soil salinity with resulting effects on soil nutrient transformations. Although soil nitrogen (N) transformations are key processes in terrestrial ecosystems, how irrigation with saline water affects N transformations is not fully understood. Therefore, we used metagenomics to investigate effects of 11 years saline water drip irrigation on soil bacterial community structure and N transformations in a cotton field. In a field experiment, there were two irrigation water salinity (ECw) treatments, 0.35 dS.m(-1) [freshwater (FW)] and 8.04 dS.m(-1) [saline water (SW)], and two N application rates, 0 (N0) and 360 kg N ha(-1) (N360). Compared with FW irrigation, SW irrigation significantly increased soil water content, salinity, organic carbon, total N, and ammonium N, but significantly decreased pH, nitrate N, and potential nitrification rate (PNR). PNR was significantly positively correlated with soil nitrate N and total N but negatively correlated with soil water content. In the bacterial community, SW irrigation significantly increased relative abundances of the phyla Actinobacteria, Chloroflexi, and Gemmatimonadetes but decreased those of Proteobacteria and Acidobacteria. Saline water irrigation increased relative abundance of genes associated with N fixation (M00175), denitrification (M00529), and dissimilated nitrate reduction (M00530) but decreased that of Nitrate/nitrite transport system (M00438). Saline water irrigation significantly increased relative abundances of nirK, nirS, norC, nifD, nifK, nifH, gdhA, GDH2, GLUD1_2, nasB, narI, narG, narH, nxrA, and nxrB genes but decreased those of amoC nirA, nirB, nirD, narB, norB, gudB, GLU, napA, and nasA. Saline water irrigation also affected enzymes associated with N transformations, with increases in relative abundance of enzyme genes associated with nitrite reductase (NO formation), N fixation enzymes, and glutamate dehydrogenase and decreases in that of glutamate synthase. According to redundancy analysis, soil water content, electrical conductivity, and bulk density were the main soil physicochemical drivers of functional genes affecting N transformations. Thus, SW irrigation changes bacterial community composition by affecting soil physicochemical properties and therefore affects N cycling by promoting denitrification and N fixation and inhibiting nitrification.
英文关键词	Saline water irrigation N fertilizer Metagenomic analysis Microbial composition N transformations
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000882360600011
WOS关键词	AMMONIA-OXIDIZING ARCHAEA ; N2O EMISSIONS ; MICROBIAL COMMUNITY ; USE EFFICIENCY ; RIVER ESTUARY ; DENITRIFICATION RATES ; PHYSICAL-PROPERTIES ; AGRICULTURAL SOILS ; ENZYME-ACTIVITIES ; CALCAREOUS SOIL
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/2XILL650/395376
推荐引用方式 GB/T 7714	Guo, Xiaowen,Du, Siyao,Guo, Huijuan,et al. Long-term saline water drip irrigation alters soil physicochemical properties, bacterial community structure, and nitrogen transformations in cotton[J],2023,182.
APA	Guo, Xiaowen,Du, Siyao,Guo, Huijuan,&Min, Wei.(2023).Long-term saline water drip irrigation alters soil physicochemical properties, bacterial community structure, and nitrogen transformations in cotton.APPLIED SOIL ECOLOGY,182.
MLA	Guo, Xiaowen,et al."Long-term saline water drip irrigation alters soil physicochemical properties, bacterial community structure, and nitrogen transformations in cotton".APPLIED SOIL ECOLOGY 182(2023).