Soil Microbial Community Response to Nitrogen Application on a Swamp Meadow in the Arid Region of Central Asia

Frontiers in Microbiology

Microbiology

Mo Chen¹  Mengfei Cong²  Zailei Yang²  Yang Hu²  Xinping Zhu³  Hongtao Jia³ 

[1] College of Grassland Science, Xinjiang Agricultural University, Urumqi, China;College of Resources and Environment, Xinjiang Agricultural University, Urumqi, China;College of Resources and Environment, Xinjiang Agricultural University, Urumqi, China;Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi, China;

关键词: nitrogen application;    swamp meadow;    microbial community;    bacteria;    fungi;   

DOI  :  10.3389/fmicb.2021.797306

 received in 2021-10-18, accepted in 2021-12-09,  发布年份 2022

来源: Frontiers

【 摘 要 】

Although a large number of studies have reported the importance of microbial communities in terrestrial ecosystems and their response to nitrogen (N) application, it is not clear in arid alpine wetlands, and the mechanisms involved need to be clarified. Therefore, the response of the soil microbial community in a swamp meadow to short-term (1 year) N application (CK: 0, N1: 8, N2: 16 kg⋅N⋅hm–2⋅a–1) was studied using 16S/ITS rRNA gene high-throughput sequencing technology. Results showed that N application had no significant effect on soil microbial community diversity, but significantly changed soil bacterial community structure. N1 and N2 treatments significantly reduced the relative abundance of Chloroflexi (18.11 and 32.99% lower than CK, respectively). N2 treatment significantly reduced the relative abundance of Nitrospirae (24.94% lower than CK). Meanwhile, N application reduced the potential function of partial nitrogen (N) and sulfur (S) cycling in bacterial community. For example, compared with CK, nitrate respiration and nitrogen respiration decreased by 35.78–69.06%, and dark sulfide oxidation decreased by 76.36–94.29%. N application had little effect on fungal community structure and function. In general, short-term N application directly affected bacterial community structure and indirectly affected bacterial community structure and function through available potassium, while soil organic carbon was an important factor affecting fungal community structure and function.

【 授权许可】

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Copyright © 2022 Hu, Chen, Yang, Cong, Zhu and Jia.