Details

Autor(en) / Beteiligte

• Ma, Lin
• Pan, Yongtai
• Wang, Xiayi
• Liu, Guihua
• Liu, Wenzhi

Titel

Discrepancy in Response of Complete Ammonia Oxidizers and Ammonia-Oxidizing Bacteria and Archaea in the Lhasa River to High-Elevation Conditions

Ist Teil von

• ACS ES&T water, 2023-10, Vol.3 (10), p.3357-3368

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Nitrogen cycle in rivers is significantly influenced by ammonia oxidation, which is driven by ammonia-oxidizing archaea/bacteria (AOA/AOB) and complete ammonia oxidizers (comammox). However, the performance of different ammonia oxidizers in high-elevation rivers is poorly documented. Activity, abundance, diversity, and community composition of ammonia oxidizers in the Lhasa River were investigated. Unamended nitrification rates (UNRs) greatly changed and showed remarkable seasonality and were significantly correlated with solar radiation, dissolved oxygen (DO), and ammonium nitrogen (NH4 +-N). AOB abundance and solar radiation had the strongest direct and indirect effects on UNR. Comammox amoA gene abundance exceeded that of AOA and AOB in 96% of the samples. Most comammox sequences were grouped into clade B, and dominant comammox species were strongly affected by latitude, water NH4 +-N, and total organic carbon. Temperature and total suspended solids were key factors explaining the dominance of the AOA species. Nitrosospira and Nitrosovibrio clusters were found in large proportions in the AOB communities. The co-occurrence pattern of ammonia oxidizers in the Lhasa River was mainly attributed to interspecific symbiosis, even though more modules were found in AOB communities. This provides a comprehensive understanding of the adaptation mechanisms of ammonia oxidizers and their roles in the nitrogen cycle of plateau rivers under global climate warming.