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Comammox plays a functionally important role in the nitrification of rice paddy soil with different nitrogen fertilization levels

文献类型： 外文期刊

作者： Zhang, Kai 1 ; Sun, Hui-Feng 2 ; Kang, You-Cai 4 ; Jiang, Ran 1 ; Wang, Yan-Ren 1 ; Zhang, Ru-Yi 1 ; Zhang, Sheng-Nan 1 ; Li, Yang-Yang 5 ; Li, Peng 6 ; Yang, Fan 7 ; Zhou, Sheng 2 ; Quan, Zhe-Xue 1 ;

作者机构： 1.Fudan Univ, Inst Biodivers Sci, Sch Life Sci, Minist Educ,Key Lab Biodivers Sci & Ecol Engn, Shanghai 200438, Peoples R China

2.Shanghai Acad Agr Sci, Ecoenvironm Protect Res Inst, Shanghai 201403, Peoples R China

3.Shanghai Engn Res Ctr Low Carbon Agr SERCLA, Shanghai 201415, Peoples R China

4.Northwest Normal Univ, Coll Chem & Chem Engn, Key Lab Ecofunct Polymer Mat, Key Lab Polymer Mat Gansu Prov,Minist Educ, Lanzhou 730070, Peoples R China

5.Northwest A&F Univ, Inst Soil & Water Conservat, Key Lab Soil Eros & Dryland Farming Loess Plateau, Yangling 712100, Shaanxi, Peoples R China

6.Shanghai Acad Agr Sci, Biotechnol Res Inst, Shanghai 201106, Peoples R China

7.Shanghai Jiao Tong Univ, Instrumental Anal Ctr, 800 Dongchuan Rd, Shanghai 200240, Peoples R China

8.Fudan Univ, Sch Life Sci, 2005 Songhu Rd, Shanghai, Peoples R China

关键词： Comammox; Gross ammonia-oxidizing activity; (NO3)-N-15 isotopic pool dilution; Nitrification inhibitor

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：4.8； 五年影响因子：5.1 ）

ISSN： 0929-1393

年卷期： 2024 年 193 卷

页码：

收录情况： SCI

摘要： Chemoautotrophic ammonia-oxidizing bacteria (AOB), ammonia-oxidizing archaea (AOA), and the recently discovered complete ammonia oxidizers (comammox) catalyze ammonia oxidation; however, quantifying their individual gross ammonia oxidation activities in complex soil ecosystems remains elusive. In this study, we investigated the nitrifying population and community dynamics in response to fertilization in paddy soil under long-term treatment with different urea concentrations (0, 100, 200, and 300 kg N ha(-1); designated N0, N100, N200, and N300, respectively). The community structure of nitrifiers, including comammox, was changed by long-term N fertilizers input, which also enhanced AOB abundance and comammox clade A/B abundance ratio, whereas it did not affect AOA abundance. Nevertheless, the microbial population sizes and community compositions remained largely similar following short-term fertilization throughout one rice-growing season. Furthermore, by employing a (NO3)-N-15 pool dilution technique in combination with chlorate and 1-octyne inhibition, we conducted a soil microcosm incubation without substrate supplementation to distinguish the relative contribution of comammox to gross ammonia oxidation from those of AOA and AOB. Comammox exhibited higher nitrification activity in soils treated with more N fertilizers, with the contribution increasing from 34 % (N0) to 75 % (N300), although its abundance was not dominant. This could be attributed to the repeated N-based fertilization, which reduced the soil pH, thereby decreasing the soil-free ammonia concentration. In contrast, the contribution of AOA declined from 57 % (N0) to 19 % (N300), while that of AOB only accounted for a minor fraction (<25 %) despite being in high abundance. Altogether, our findings provide evidence that the activity of nitrifying guilds is more valuable than their abundance and provide insights into the potential functional significance of comammox in the nitrification process in rice paddy systems.

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