Successional dynamics of microbial communities in response to concentration perturbation in constructed wetland system

Xinyue Zhao; Mengran Guo; Juntong Chen; Zhixuan Zhuang; Tuoshi Zhang; Xiaohui Wang; Chunyan Li; Ning Hou; Shunwen Bai

doi:10.1016/j.biortech.2022.127733

Successional dynamics of microbial communities in response to concentration perturbation in constructed wetland system

Bioresour Technol. 2022 Oct:361:127733. doi: 10.1016/j.biortech.2022.127733. Epub 2022 Aug 3.

Authors

Xinyue Zhao¹, Mengran Guo¹, Juntong Chen¹, Zhixuan Zhuang¹, Tuoshi Zhang¹, Xiaohui Wang², Chunyan Li¹, Ning Hou¹, Shunwen Bai³

Affiliations

¹ College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China.
² Beijing Engineering Research Center of Environmental Material for Water Purification, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
³ School of Environment, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address: baishunwen@hit.edu.cn.

PMID: 35932946
DOI: 10.1016/j.biortech.2022.127733

Abstract

Constructed wetlands (CWs) are widely considered as resilient systems able to adapt to environmental perturbations. Little attention has been paid, however, to microbial dynamics when CWs withstand and recover from external shock. To understand the resilience of CWs, this study investigated rhizosphere microbial dynamics when CWs were subjected to influent COD perturbation (200 mg/L-1600 mg/L). Results demonstrated that CWs had strong adaptability to different influent perturbations, characterized by transitions from fluctuating to stable pollutant removal. Microbial analysis showed that rhizosphere microorganisms competed for niches in response to increased COD concentrations, and Trichococcus played key roles in resisting concentration perturbations. Structural equation modeling indicated that rhizosphere community succession and microbial energy metabolism were shaped by pH and DO. These findings provide insights into the mechanism for CW stability maintenance when facing concentration perturbations.

Keywords: Constructed wetland; Environmental perturbation; Keystone species; Microbial community; Rhizosphere.

MeSH terms

Attention
Microbiota*
Nitrogen
Rhizosphere
Waste Disposal, Fluid / methods
Wastewater
Wetlands*

Substances

Waste Water
Nitrogen