Different responses of ammonia-oxidizing archaea and bacteria in paddy soils to elevated CO2 concentration. (1st October 2021)

• Record Type: Journal Article
• Authors: Shen, Li-dong; Yang, Yu-ling; Liu, Jia-qi; Hu, Zheng-hua; Liu, Xin; Tian, Mao-hui; Yang, Wang-ting; Jin, Jing-hao; Wang, Hao-yu; Wang, Yuan-yuan; Wu, Hong-sheng
• Is Part Of: Environmental pollution. Volume 286(2021)
• Publication Date: 2021-10-01
• Subjects: Elevated CO2 -- Ammonia oxidizers -- Community structure -- Abundance -- Paddy ecosystem; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2021.117558
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: The elevated atmospheric CO2 concentration is well known to have an important effect on soil nutrient cycling. Ammonia oxidation, mediated by ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB), is the rate-limiting step in soil nitrification, which controls the availability of two key soil nutrients (ammonium and nitrate) for crops. Until now, how the AOA and AOB communities in paddy soils respond to elevated CO2 remains largely unknown. Here, we examined the communities of AOA and AOB and nitrification potential at both surface (0–5 cm) and subsurface (5–10 cm) soil layers of paddy fields under three different CO2 treatments, including CK (ambient CO2 concentration), LT (CK + 160 ppm of CO2 ) and HT (CK + 200 ppm of CO2 ). The elevated CO2 was found to have a greater impact on the community structure of AOB than that of AOA in surface soils as revealed by high-throughput sequencing of their amo A genes. However, no obvious variation of AOA or AOB communities was observed in subsurface soils among different CO2 treatments. The abundance of AOA and AOB, and nitrification potential were significantly increased in surface soils under elevated CO2 . The variation of AOB abundance correlated well with the variation of nitrification potential. The soil water content and dissolved organic carbon content had important impacts on the dynamic of AOB communities and nitrification potential. Overall, our results showed different responses of AOA and AOB communities to elevated CO2 in paddy ecosystems, and AOB were more sensitive to the rising CO2 concentration. Graphical abstract: Image 1 Highlights: Elevated CO2 had a significant impact on ammonia oxidizers primarily in surface soils. Elevated CO2 had a greater impact on community composition of AOB than that of AOA. Elevated CO2 stimulated the nitrification potential and growth of both AOA and AOB. Variation of AOB abundance positively correlated with that of nitrification potential. Soil dissolved organic carbon had a positive impact on nitrification potential. Abstract : The rising CO2 concentration positively affected soil AOA and AOB in paddy fields, leading to an increase in nitrification rates.