AI Article Synopsis
- The study reveals that Comammox bacteria (CMX) significantly contribute to the nitrification process in constructed wetlands (CWs), challenging traditional views.
- Through DNA-based methods, researchers found high abundance and active participation of CMX in ammonia oxidation, exceeding that of ammonia-oxidizing bacteria (AOB) in certain areas.
- Phylogenetic analysis identified N. nitrosa as the dominant CMX species, highlighting its essential role in the nitrogen cycle of CWs.
Article Abstract
The discovery of Comammox bacteria (CMX) has changed our traditional concept towards nitrification, yet its role in constructed wetlands (CWs) remains unclear. This study investigated the contributions of CMX and two canonical ammonia-oxidizing microorganisms, ammonia-oxidizing bacteria (AOB) and archaea to nitrification in four regions (sediment, shoreside, adjacent soil, and water) of a typical CW using DNA-based stable isotope probing. The results revealed that CMX not only widely occurred in sediment and shoreside zones with high abundance (5.08 × 10 and 6.57 × 10 copies g soil, respectively), but also actively participated in ammonia oxidation, achieving ammonia oxidation rates of 1.43 and 2.00 times that of AOB in sediment and shoreside, respectively. Phylogenetic analysis indicated that N. nitrosa was the dominant and active CMX species. These findings uncovered the crucial role of CMX in nitrification of sediment and shoreside, providing a new insight into nitrogen cycle of constructed wetlands.
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| http://dx.doi.org/10.1016/j.biortech.2024.130637 | DOI Listing |
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