College of Resource and Environment, Northeast Agricultural University, Harbin 150030, China.
Beijing Engineering Research Center of Environmental Material for Water Purification, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
Bioresour Technol. 2022 Oct;361:127733. doi: 10.1016/j.biortech.2022.127733. Epub 2022 Aug 3.
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.
人工湿地（CWs）被广泛认为是具有弹性的系统，能够适应环境干扰。然而，当 CWs 承受和从外部冲击中恢复时，很少关注微生物动态。为了了解 CWs 的弹性，本研究调查了 CWs 受到进水 COD 干扰（200mg/L-1600mg/L）时根际微生物动态。结果表明，CWs 对不同的进水干扰具有很强的适应性，表现为污染物去除从波动到稳定的转变。微生物分析表明，根际微生物为了争夺栖息地而竞争，以应对 COD 浓度的增加，而 Trichococcus 在抵抗浓度干扰方面发挥了关键作用。结构方程模型表明，根际群落演替和微生物能量代谢受 pH 和 DO 的影响。这些发现为 CW 在面对浓度干扰时维持稳定性的机制提供了深入了解。
