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Updated: Jun 18, 2025

Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems
Published on: October 29, 2016
Groundwater flow regime shapes nitrogen functional traits by affecting microbial community assembly processes in the
Helin Wang1, Ping Li2, Xiaohan Liu2
1State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, PR China.
Groundwater flow shapes nitrogen-cycling microbial communities. Environmental changes along flow paths alter microbial assembly, shifting nitrogen removal from nitrification-denitrification to partial nitrification-anammox.
Area of Science:
- Environmental Microbiology
- Geochemistry
- Hydrogeology
Background:
- The nitrogen (N) cycle in groundwater is complex, influenced by biological and environmental factors.
- Understanding microbial community assembly and its impact on N-cycling under varying hydrogeological conditions is crucial but limited.
- Groundwater flow paths create unique environments influencing microbial processes.
Purpose of the Study:
- To investigate the assembly patterns of nitrogen-cycling microbial communities along groundwater flow paths.
- To determine how hydrogeological conditions and environmental heterogeneity influence microbial community structure and function.
- To elucidate the shifts in nitrogen removal pathways in response to groundwater flow dynamics.
Main Methods:
- Analysis of N-cycling microbial community assembly patterns along groundwater flow paths.
- Assessment of environmental heterogeneity and hydrological phases.
- Correlation of microbial community assembly with environmental parameters like dissolved oxygen (DO).
Main Results:
- Environmental heterogeneity increased along the groundwater flow path, correlating with distinct microbial community assembly patterns.
- Nitrogen removal pathways shifted from "nitrification-denitrification" in recharge areas to "partial nitrification-anammox" in discharge areas.
- Nitrifying microorganisms were influenced by heterogeneous selection and DO concentrations, while anammox bacterial communities showed stochastic assemblies.
Conclusions:
- Groundwater flow regimes are key determinants of microbial community assembly patterns in N-cycling.
- Increasing environmental heterogeneity promotes deterministic assembly and higher community turnover.
- This study provides insights into nitrogen transitions and microbial responses to environmental variations in groundwater systems.
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