文献类型： 外文期刊

作者： Yuan, Yuhan ¹ ; Wang, Meng ² ; Feng, Xuewan ¹ ; Li, Qian ² ; Qin, Yubo ² ; Sun, Bo ² ; Li, Cuilan ¹ ; Zhang, Jinjing ¹ ; Liu, Hang ¹ ;

作者机构： 1.Jilin Agr Univ, Coll Resource & Environm Sci, Key Lab Soil Resource Sustainable Utilizat Jilin P, Changchun 130118, Peoples R China

2.Jilin Acad Agr Sci, Inst Agr Environm & Resources Res, Changchun 130033, Peoples R China

关键词： N fertilizer application rate; nitrite-oxidizing bacteria (NOB); Nitrospira-like NOB; Nitrobacter-like NOB; nitrite oxidoreductase; nitrite oxidation potential (PNO)

期刊名称：AGRONOMY-BASEL （ 影响因子：3.7； 五年影响因子：4.0 ）

ISSN：

年卷期： 2023 年 13 卷 12 期

页码：

收录情况： SCI

摘要： The accumulation of nitrite is frequently overlooked, despite the fact that nitrification is the most essential phase of the entire nitrogen (N) cycle and that nitrifying bacteria play a significant role in nitrification. At present, the effects of different N application rates on soil nitrite-oxidizing bacteria (NOB) abundance, community composition, diversity, and its main influencing factors are still unclear. In this study, five N fertilizer application rates under film mulching and a drip irrigation system were studied in the semi-arid area of Northeast China. The treatments were 0 kg ha(-1) (N0), 90 kg ha(-1) (N1), 150 kg ha(-1) (N2), 210 kg ha(-1) (N3), and 270 kg ha(-1) (N4). Fluorescent quantitative PCR and Illumina Miseq sequencing were used to analyze the abundance and community structure of NOB under different amounts of N application. The results showed that the increase in amounts of N application was strongly accompanied by an increase in the content of soil organic matter (SOM), total nitrogen (TN), nitrate nitrogen (NO3--N), and ammonium nitrogen (NH4+-N), while the pH significantly reduced with an increase in N fertilization. N fertilization significantly increased soil nitrite oxidoreductase (NXR) activity, soil nitrification potential (PNR), and soil nitrite oxidation potential (PNO). A high N application rate significantly heightened the abundance of Nitrospira- and Nitrobacter-like NOB. N fertilizer considerably raised the Shannon index of Nitrospira-like NOB. The N application amount was the key factor affecting the community structure of Nitrospira-like NOB, and available nitrogen (AN) had the dominant influence on the community structure of Nitrospira-like NOB. N fertilizer can cause soil acidification, which affects NOB abundance and diversity. Nitrospira-like NOB may promote nitrite oxidation in different N application rates under a mulched fertigation system. The findings offered a crucial scientific foundation for further investigation into how nitrite-oxidizing bacteria respond to N fertilizer management strategies in farmland soil under film mulching drip irrigation in Northeast China.