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Response of soil bacterial community composition and its associated geochemical parameters to rapid short-term cyclic groundwater-level oscillations: soil column experiments

Xia, Xuefeng; Cheng, Lirong; Zhu, Yi; Liu, Yueqiao; Wang, Kai; Ding, Aizhong; Cai, Zuansi; Shi, Huansheng; Zuo, Lili

Authors

Xuefeng Xia

Lirong Cheng

Yi Zhu

Yueqiao Liu

Kai Wang

Aizhong Ding

Huansheng Shi

Lili Zuo



Abstract

Groundwater-level oscillations change geochemical conditions, carbon cycling processes and bacterial community composition, and these changes may vary vertically with depth in a soil. In this study, soil column experiments were conducted to explore variations in soil bacterial community composition and its associated geochemical parameters to rapid short-term cyclic groundwater-level oscillations driven by natural fluctuations (NF) and rainfall infiltration (RI) and the results are compared with quasi static (QS) column. Water saturation patterns in vadose and oscillated zones, and oxygen level patterns, soil total organic carbon (TOC) removal rates and soil bacterial community composition in vadose, oscillated and saturated zones were evaluated. Results showed that water saturation and oxygen level oscillated with groundwater level in NF and RI columns. TOC removal rates in RI column were the highest across vadose (~38.4%), oscillated (~35.8%) and saturated (~35.2%) zones. Deltaproteobacteria, which was significantly correlated with TOC removal (p < 0.05), exhibited relatively higher abundances in the vadose and oscillated zones of RI column than those of QS and NF columns. Soil bacterial community structure was dynamic at the class level due to water saturation, oxygen level and TOC removal. TOC removal was the driver to separate distribution of bacterial community structure in the vadose and oscillated zones of RI column from those of QS and NF columns. This study suggests that RI induced rapid short-term cyclic groundwater-level oscillations could significantly influence both soil carbon cycle and bacterial community structure in vadose and oscillated zones.

Journal Article Type Article
Acceptance Date Jan 27, 2020
Online Publication Date Mar 5, 2020
Publication Date 2020
Deposit Date Jan 31, 2020
Publicly Available Date Sep 6, 2021
Electronic ISSN 1539-1663
Publisher Soil Science Society of America
Peer Reviewed Peer Reviewed
Volume 19
Issue 1
Article Number e20011
DOI https://doi.org/10.1002/vzj2.20011
Keywords groundwater-level oscillations; soil carbon cycle; bacterial community composition
Public URL http://researchrepository.napier.ac.uk/Output/2515118

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Response of soil bacterial community composition and its associated geochemical parameters to rapid short-term cyclic groundwater-level oscillations: soil column experiments (1.3 Mb)
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Publisher Licence URL
http://creativecommons.org/licenses/by-nc-nd/4.0/

Copyright Statement
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
© 2020 The Authors. Vadose Zone Journal published by Wiley Periodicals, Inc. on behalf of Soil Science Society of America


Response of soil bacterial community composition and its associated geochemical parameters to rapid short-term cyclic groundwater-level oscillations: soil column experiments (1.7 Mb)
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