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Effects of synthetic nitrification inhibitor (3,4-dimethylpyrazole phosphate; DMPP) and biological nitrification inhibitor (methyl 3-(4-hydroxyphenyl) propionate; MHPP) on the gross N nitrification rate and ammonia oxidizers in two contrasting soils

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Abstract

An aerobic 15N microcosmic experiment was conducted to compare the inhibitory effects of the biological nitrification inhibitor (BNI), methyl 3-(4-hydroxyphenyl) propionate (MHPP) at rates of 500 and 1000 mg kg−1 with the synthetic nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) at 1% of applied NH4+, on the gross nitrification rate (n_gross) and on the abundance and community composition of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) of two contrasting soils (pH: 5.10 vs. 8.15, clay content 17.8 vs. 30.8). DMPP inhibited 56.6% of n_gross in the acidic soil and 50.3% in the calcareous soil, whereas MHPP inhibited 18.3–55.5% of n_gross in the acidic soil and 14.1–20.2% in the calcareous soil. MHPP used at the high rate showed the same inhibition on n_gross as DMPP in the acidic soil but not in the calcareous soil. DMPP and MHPP likely regulated n_gross by causing niche differentiation between AOA and AOB. Moreover, the community composition of AOB was more sensitive to nitrification inhibitor application than that of AOA, particularly in the acidic soil. However, the response of AOB community composition was less sensitive to the application of MHPP than to that of DMPP. MHPP mainly targeted Nitrosospira clusters 3a.2, 3b.2, and 9 of the AOB in the acidic soil.

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Funding

This work was supported by the National Natural Science Foundation of the People’s Republic of China (42077096) and the Science and Technology Department of Sichuan Province, China (2021JDRC0034).

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Ting Lan is responsible for discussion, methodology, writing, and funding acquisition. Mengxiao Li and Xiaoqian He conducted the experiment and performed most laboratory analyses. Ouping Deng, Wei Zhou, Ling Luo, and Guangdeng Chen performed data analyses. Shu Yuan, Jing Ling, Min Zeng, and Xuesong Gao read and revised the manuscript.

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Correspondence to Ting Lan.

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The authors declare no competing interests.

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Lan, T., Li, M., He, X. et al. Effects of synthetic nitrification inhibitor (3,4-dimethylpyrazole phosphate; DMPP) and biological nitrification inhibitor (methyl 3-(4-hydroxyphenyl) propionate; MHPP) on the gross N nitrification rate and ammonia oxidizers in two contrasting soils. Biol Fertil Soils 58, 333–344 (2022). https://doi.org/10.1007/s00374-022-01628-x

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  • DOI: https://doi.org/10.1007/s00374-022-01628-x

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