Impacts of short-term increased CO2 levels on the composition of amoA-type nitrifying and nirS-type denitrifying bacterial communities in soybean rhizosphere in Mollisols.
In: Applied Soil Ecology, Jg. 199 (2024-07-01), S. N.PAG
academicJournal
Zugriff:
Increased atmospheric carbon dioxide (CO 2) concentrations cause climate change, affecting the stability of agricultural ecosystems. Soil nitrification and denitrification, which are fundamental N cycling processes, determine soil N availability for plants, nitrous oxide (N 2 O) emissions, and N flow in ecosystems. However, the responses of specific nitrifying and denitrifying soil microorganisms to increased CO 2 levels remain unknown. In this study, four soybean [ Glycine max (L.) Merr.] varieties (Xiaohuangjin [XHJ], Suinong 14 [SN14], Mufeng 5 [MF5], and Dongsheng 1 [DS1]) were planted in open-top chambers containing Mollisols under ambient CO 2 (aCO 2 , 410 ppm) and elevated CO 2 (eCO 2 , 550 ppm) conditions. The abundance, composition, and potential activity of ammonia mono‑oxygenase subunit A gene (amoA) of ammonia oxidise bacteria (AOB) and nitrite reductase S gene (nirS)-type denitrifiers under increased atmospheric CO 2 levels were investigated. The results showed that eCO 2 decreased the nitrification potential in XHJ and MF5 rhizospheres, whereas increasing it in the SN14 rhizosphere. Denitrification potential decreased in the rhizosphere of all soybean cultivars, except XHJ, under eCO 2 conditions. The decreased nitrification and denitrification potentials imply that eCO 2 conditions may slow N 2 O emission. Principal co-ordinate analysis revealed that the composition of amoA and nirS communities was not altered by eCO 2 , but rather by the presence of different soybean cultivars. The eCO 2 -induced variations in the nitrification and denitrification potentials of microbes in the rhizosphere among different cultivars can affect the N cycle and should be considered in future soybean breeding programmes. [ABSTRACT FROM AUTHOR]
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Impacts of short-term increased CO2 levels on the composition of amoA-type nitrifying and nirS-type denitrifying bacterial communities in soybean rhizosphere in Mollisols.
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Autor/in / Beteiligte Person: | Gao, Zhiying ; Guo, Lili ; Li, Yansheng ; Jin, Jian ; Xu, Ying ; Liu, Xiaobing ; Yu, Zhenhua |
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Zeitschrift: | Applied Soil Ecology, Jg. 199 (2024-07-01), S. N.PAG |
Veröffentlichung: | 2024 |
Medientyp: | academicJournal |
ISSN: | 0929-1393 (print) |
DOI: | 10.1016/j.apsoil.2024.105408 |
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