Long-term addition of organic manure stimulates the growth and activity of comammox in a subtropical Inceptisol

文献类型： 外文期刊

第一作者： Zeng, Yu

作者： Zeng, Yu;Tan, Che;Zhang, Lei;Zheng, Wanning;Peng, Hongyun;Liang, Yongchao;You, Lelin;Chen, Hao;Wu, Chunyan

作者机构：

关键词： Comammox; Fertilizers; Nitrification activity; Nitrous oxide; Nitrification inhibitors

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：8.2； 五年影响因子：8.6 ）

ISSN： 0048-9697

年卷期： 2024 年 948 卷

页码：

收录情况： SCI

摘要： The discovery of complete ammonia oxidizers (comammox) has dramatically altered our perception of nitrogen (N) biogeochemistry. However, their functional importance vs. the canonical ammonia oxidizers (i.e., ammonia oxidizing-archaea (AOA) and bacteria (AOB)) in agroecosystems is still poorly understood. Accordingly, a new assay using acetylene, 3,4-dimethylpyrazole phosphate (DMPP), and 1-octyne was adopted to assess the ammonia (NH3) 3 ) oxidation and nitrous oxide (N2O) 2 O) production activity of these functional guilds in a subtropical Inceptisol under long-term different fertilization regimes. These regimes include CK (no fertilizer control), synthetic fertilizer only (NPK), organic manure only (M) and organic manure plus synthetic fertilizer (MNPK). AOA dominated NH3 3 oxidation in the M treatment, while AOB dominated both NH3 3 oxidation and N2O 2 O production in all treatments except M. Comammox always played a minor role in both NH3 3 oxidation and N2O 2 O production across all treatments. Both M and MNPK treatments significantly increased the activity and growth of comammox. Compared to NPK, comammox exhibited increases of 270 % and 326 % in the NH3 3 oxidation rates, and increases of 1472 % and 563 % in the N2O 2 O production rates in M and MNPK, respectively. Random forest model revealed that copper (Cu), comammox abundance, and dissolved organic nitrogen (DON) were the most important predictors for the NH3 3 oxidation rates of comammox. Redundancy analyses (RDA) showed that fertilizer treatments significantly altered the community composition of NH3 3 oxidizers, and pH was the overarching parameter underpinning the community shift of the NH3 3 oxidizers. Overall, this study provides evidence that comammox play a minor yet unneglectable role in the nitrification of agroecosystems, and the long-term addition of organic manure stimulates the growth and activity of comammox in a subtropical Inceptisol.

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