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Lack of inhibitory effects of 1-Octyne and PTIO on ammonia oxidizers, nitrite oxidizers, and nitrate formation in acidic paddy soils

文献类型： 外文期刊

作者： Gao, Wenlong 1 ; Zhang, Wen 1 ; Liu, Huiran 1 ; Chen, Xin 1 ; Fan, Changhua 1 ; Liu, Yuqin 1 ; Wu, Xiaolong 1 ; Chen, Miao 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Haikou 571101, Peoples R China; Hainan Danzhou Trop Agroecosyst Natl Observat & Re, Danzhou 571737, Peoples R China; Minist Agr & Rural Affairs, Key Lab Low Carbon Green Agr Trop Reg China, Haikou, Peoples R China

关键词： Comammox Nitrospira; Nitrite oxidizers; Nitrate formation; Nitrification inhibitors; N-15 pool dilution technique; Acidic paddy soils

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：5.0； 五年影响因子：5.4 ）

ISSN： 0929-1393

年卷期： 2024 年 203 卷

页码：

收录情况： SCI

摘要： The feasibility of employing double inhibitors consisting of PTIO and 1-octyne with the 15 N pool dilution technique to distinguish comammox process from archaeal and bacterial nitrification remains to be confirmed. As such, we carried out a nitrification inhibition experiment on acidic paddy soils at a pH of 5.0, 5.3, and 5.4 to investigate the effects of 1-octyne and PTIO on nitrate (NO3-) formation, ammonia (NH3)-oxidizing archaea (AOA) and bacteria (AOB), comammox Nitrospira, and nitrite (NO2-)-oxidizing bacteria (NOB) under urea fertilized- and unfertilized-conditions. We observed that 1-Octyne stimulated the growth of comammox Nitrospira clades A and B, and Nitrobacter-like-like NOB and Nitrospira-like-like NOB without inhibiting AOB growth. This observation indicates that 1-Octyne has the potential to promote comammox process and NO2- oxidization, and its usage may lead to an underestimation of AOB activity. Unexpectedly, we found that PTIO was incapable of causing a rapid inhibition of AOA growth and NO3- formation. In the short term, PTIO was usually not detrimental to the growth of comammox Nitrospira clades A and B, AOB, and Nitrobacter-like-like NOB. Instead, increased growth of AOB and Nitrospira-like-like NOB were observed following its application. Likely due to increased bacterial nitrification and NO2- oxidation and the reaction of PTIO with nitric oxide (NO) produced by non-nitrification processes, increased NO3- formation with PTIO was observable in acidic soils with varying N statuses. These findings highlight the need to develop novel and more efficient inhibition strategies to actualize rate distinction among AOA, AOB, comammox Nitrospira in acidic soils.

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