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Anthropogenic land uses shape denitrification-related microbial communities in freshwater river ecosystems
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  • Xing Liu,
  • Baozhu Pan,
  • Zhenyu Huang,
  • Xinyuan Liu,
  • Haoran He,
  • Xinzheng Zhu
Xing Liu
Xi'an University of Technology

Corresponding Author:[email protected]

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Baozhu Pan
Xi'an University of Technology
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Zhenyu Huang
Xi'an University of Technology
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Xinyuan Liu
Xi'an University of Technology
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Haoran He
Xi'an University of Technology
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Xinzheng Zhu
Xi'an University of Technology
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Abstract

Microbiota play essential roles in nitrogen (N) cycling in freshwater river ecosystems. However, microbial functional groups associated with N cycling (especially denitrification) in freshwater rivers under anthropogenic disturbance are still poorly understood. Here, we studied the impacts of different land-use types on denitrification-related microbial communities in Weihe River, Hanjiang River, and their tributaries, in the Qinling Mountains, China. The major land-use types in the three river areas were divided into natural (forest, shrub, grassland, and open water) and anthropogenic (agricultural and urbanized land) types. A landscape survey of microbiota in the river water and sediment was carried out with extensive sample sources based on deep 16S rRNA gene sequencing, which yielded operational taxonomic units for predicting functional groups. With increases in proportions of agricultural and urbanized land areas, electrical conductivity, total N, ammonium-N, and nitrate-N all increased in water samples. Conversely, microbial diversity exhibited a decreasing trend in water samples, whereas the relative abundance of denitrification-related functional groups increased, with increases in the proportions of agricultural and urbanized land areas. The relative abundances of denitrification- and human-related microbial functional groups in sediment samples were distinctively higher in Weihe River (mainly under agriculture and urbanization), when compared with those of Hanjiang River and Qinling tributaries (dominated by forests). The results indicate that anthropogenic land-use types, such as agricultural and urbanized land, result in simple microbial community structure and stimulate microbe-mediated denitrification in freshwater rivers.
25 Feb 2022Submitted to Land Degradation & Development
26 Feb 2022Submission Checks Completed
26 Feb 2022Assigned to Editor
06 Mar 2022Reviewer(s) Assigned
08 May 2022Review(s) Completed, Editorial Evaluation Pending
10 Jun 20221st Revision Received
13 Jun 2022Assigned to Editor
13 Jun 2022Submission Checks Completed
23 Jul 2022Review(s) Completed, Editorial Evaluation Pending
23 Jul 2022Editorial Decision: Revise Minor
25 Jul 20222nd Revision Received
27 Jul 2022Assigned to Editor
27 Jul 2022Submission Checks Completed
30 Jul 2022Review(s) Completed, Editorial Evaluation Pending
30 Jul 2022Editorial Decision: Revise Minor
31 Jul 20223rd Revision Received
31 Jul 2022Submission Checks Completed
31 Jul 2022Assigned to Editor
06 Aug 2022Review(s) Completed, Editorial Evaluation Pending
08 Aug 2022Editorial Decision: Revise Minor
14 Aug 20224th Revision Received
15 Aug 2022Submission Checks Completed
15 Aug 2022Assigned to Editor
22 Aug 2022Review(s) Completed, Editorial Evaluation Pending
22 Aug 2022Editorial Decision: Accept