Specific characteristics of the microbial community in the groundwater fluctuation zone

A Critical Review of Groundwater Table Fluctuation: Formation, Effects on Multifields, and Contaminant Behaviors in a Soil and Aquifer System

“…A field study implied that a nitrate reducer had a high content below the groundwater table and nitrate agents were redistributed during GTF . In addition, the interaction between groundwater and surface water also determines the redistribution of N. The GTF zone is the direct exchange area of N and water flux between the soil and the surface water, and the concentrations of N compounds (NO 3 – and NH 4 + ) in the surface water increased exponentially around Erhai Lake with an increase in the corresponding N concentrations in the GTF zone .…”

“…127 A field study implied that a nitrate reducer had a high content below the groundwater table and nitrate agents were redistributed during GTF. 128 In addition, the interaction between groundwater and surface water also determines the redistribution of N. The GTF zone is the direct exchange area of N and water flux between the soil and the surface water, and the concentrations of N compounds (NO 3 − and NH 4 + ) in the surface water increased exponentially around Erhai Lake with an increase in the corresponding N concentrations in the GTF zone. 129 Moreover, the concentrations of NO 3 − increased with an uplifted groundwater table in the U.K. over 5 years, and researchers implied that varied NO 3 − concentrations were also determined by fracture displacement and the amplitude and frequency of GTF.…”

“…Behaviors of nitrogenous compounds and VOCs during GTF. , With the synergistic effects of microorganisms and oxygen content, nitrogenous compounds undergo nitrification and denitrification in unsaturated soil and saturated aquifers. ,,, VOCs migrate into the surface environment by virtue of the capillary fringe and air–water interfaces. − …”

Indirect regulation of topsoil nutrient cycling by groundwater depth: impacts on sand-fixing vegetation and rhizosphere bacterial communities

“…Numerous studies have demonstrated that a decrease in the groundwater table induces alterations in plant communities, modifies soil physicochemical attributes, and affects soil nutrient cycling, such as carbon and nitrogen dynamics (Liu et al, 2018;Shen et al, 2022). Xi et al (2018) established a robust association between the groundwater table and plant growth, particularly root development and distribution, emphasizing that GTD is a key determinant of rooting depth under relatively stable conditions.…”

“…Mao et al (2018) indicated the positive impact of groundwater table on both aboveground and belowground plant traits, along with a concurrent reduction in soil moisture content with decreasing groundwater table in the scope of shallow groundwater table depth. Fluctuations in the groundwater table exert diverse effects on soil physicochemical properties and environmental factors such as oxygen content (O2) (Meyerhof et al, 2016), temperature (Lai et al, 2021), humidity, atmospheric pressure and chemical composition (Shen et al, 2022). Vegetation and inter-root microorganisms are sensitive to environmental changes, allowing for rapid adaptation (Bissett et al, 2010;Hill et al, 2015).…”