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Abundance and Functional Importance of Complete Ammonia Oxidizers and Other Nitrifiers in a Riparian Ecosystem
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-03-18 , DOI: 10.1021/acs.est.0c00915 Shanyun Wang 1 , Xiaomin Wang 1, 2 , Yingying Jiang 1 , Chang Han 1 , Mike S. M. Jetten 3 , Lorenz Schwark 4 , Guibing Zhu 1, 2
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-03-18 , DOI: 10.1021/acs.est.0c00915 Shanyun Wang 1 , Xiaomin Wang 1, 2 , Yingying Jiang 1 , Chang Han 1 , Mike S. M. Jetten 3 , Lorenz Schwark 4 , Guibing Zhu 1, 2
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The discovery of complete ammonia oxidation (comammox) has altered our understanding of nitrification, which is the rate-limiting process in the global nitrogen cycle. However, understanding the ecological role of comammox or its contribution to nitrification in both natural and artificial ecosystems is still in its infancy. Here, we investigated the community distribution and function of comammox bacteria in riparian ecosystems and analyzed interactions between comammox and other nitrogen cycling microorganisms. The comammox bacterial abundance and rate were higher in summer than in winter and higher in nonrhizosphere soils than in the rhizosphere. Fringe soils in the riparian zone comprise a comammox hotspot, where the abundance (2.58 × 108 copies g–1) and rate (0.86 mg N kg–1 d–1) of comammox were not only higher than at other sampling sites but also higher than those of other ammonia oxidation processes. The comammox rate correlated significantly positively with relative abundance of the comammox species Candidatus Nitrospira nitrificans but not with that of the species Candidatus Nitrospira nitrosa. Analysis of comammox interaction with other ammonia-oxidizing processes revealed ammonia-oxidizing archaea to dominate interface soils, comammox to dominate in fringe soils, and anaerobic ammonium oxidation (anammox) to dominate in interface sediments of the riparian zone. These results indicate that comammox may constitute an important and currently underestimated process of microbial nitrification in riparian zone ecosystems.
中文翻译：
河岸生态系统中完全氨氧化器和其他硝化器的丰度和功能重要性
完全氨氧化（comammox）的发现改变了我们对硝化的理解，而硝化是全球氮循环中的限速过程。但是，了解comammox的生态作用或其在自然和人工生态系统中对硝化作用的贡献仍处于起步阶段。在这里，我们调查了河岸生态系统中comammox细菌的群落分布和功能，并分析了comammox与其他氮循环微生物之间的相互作用。夏季比冬季，共生菌的细菌丰度和发生率要高，非根际土壤的共生细菌的丰度和发生率要比根际的更高。沿河带边缘土壤是一个comammox热点，那里的丰度（2.58×10 8拷贝g –1）和比率（0.86 mg N kg–1 d –1）的comammox不仅高于其他采样点，而且也高于其他氨氧化过程。该comammox率相关显著正与comammox物种的相对丰度暂定硝化nitrificans但不与该物种的暂定硝化nitrosa。comammox与其他氨氧化过程的相互作用分析表明，氨氧化古细菌在界面土壤中占主导地位，comammox在边缘土壤中占主导地位，厌氧铵氧化（anammox）在河岸带界面沉积物中占主导地位。这些结果表明，comammox可能是河岸带生态系统中微生物硝化的重要且目前被低估的过程。
更新日期：2021-04-20
中文翻译：
河岸生态系统中完全氨氧化器和其他硝化器的丰度和功能重要性
完全氨氧化（comammox）的发现改变了我们对硝化的理解，而硝化是全球氮循环中的限速过程。但是，了解comammox的生态作用或其在自然和人工生态系统中对硝化作用的贡献仍处于起步阶段。在这里，我们调查了河岸生态系统中comammox细菌的群落分布和功能，并分析了comammox与其他氮循环微生物之间的相互作用。夏季比冬季，共生菌的细菌丰度和发生率要高，非根际土壤的共生细菌的丰度和发生率要比根际的更高。沿河带边缘土壤是一个comammox热点，那里的丰度（2.58×10 8拷贝g –1）和比率（0.86 mg N kg–1 d –1）的comammox不仅高于其他采样点，而且也高于其他氨氧化过程。该comammox率相关显著正与comammox物种的相对丰度暂定硝化nitrificans但不与该物种的暂定硝化nitrosa。comammox与其他氨氧化过程的相互作用分析表明，氨氧化古细菌在界面土壤中占主导地位，comammox在边缘土壤中占主导地位，厌氧铵氧化（anammox）在河岸带界面沉积物中占主导地位。这些结果表明，comammox可能是河岸带生态系统中微生物硝化的重要且目前被低估的过程。
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