Grazing weakens competitive interactions between active methanotrophs and nitrifiers modulating greenhouse-gas emissions in grassland soils

Yong Li* (Corresponding Author), Hong Pan, Haojie Feng, Yaowei Liu, Chun-yu Lai, Yuping Zhuge, Qichun Zhang, Caixian Tang, Hongjie Di, Zhongjun Jia, Cecile Gubry-Rangin, Jianming Xu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Grassland soils serve as a biological sink and source of the potent greenhouse gases (GHG) methane (CH4) and nitrous oxide (N2O).
The underlying mechanisms responsible for those GHG emissions, specifically, the relationships between methane- and ammonia oxidizing microorganisms in grazed grassland soils are still poorly understood. Here, we characterized the effects of grazing on
in situ GHG emissions and elucidated the putative relations between the active microbes involving in methane oxidation and
nitrification activity in grassland soils. Grazing significantly decreases CH4 uptake while it increases N2O emissions basing on 14-month in situ measurement. DNA-based stable isotope probing (SIP) incubation experiment shows that grazing decreases both methane oxidation and nitrification processes and decreases the diversity of active methanotrophs and nitrifiers, and subsequently
weakens the putative competition between active methanotrophs and nitrifiers in grassland soils. These results constitute a major advance in our understanding of putative relationships between methane- and ammonia-oxidizing microorganisms and subsequent effects on nitrification and methane oxidation, which contribute to a better prediction and modeling of future balance of GHG emissions and active microbial communities in grazed grassland ecosystems.
Original languageEnglish
Article number74
Number of pages12
JournalISME Communications
Volume1
Early online date9 Dec 2021
DOIs
Publication statusPublished - Dec 2021

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