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Related Concept Videos

Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme nitrate reductase...
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Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
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Relationship between catchment characteristics and nitrogen forms in Cao-E River Basin, Eastern China.

Shuquan Jin1, Jun Lu, Dingjiang Chen

  • 1Department of Natural Resources, College of Environmental Science and Natural Resources, Zhejiang University, Hangzhou 310029, China. Jinshuq@126.com

Journal of Environmental Sciences (China)
|July 29, 2009
PubMed
Summary

This study reveals how nitrogen pollution varies across different river types. Urban areas show higher ammonium and organic nitrogen, while agricultural areas have more nitrate, impacting water quality significantly.

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Area of Science:

  • Environmental Chemistry
  • Water Quality Assessment
  • River Basin Management

Background:

  • Nitrogen pollution is a major environmental concern in river systems.
  • Understanding the distribution of nitrogen forms is crucial for effective water management.
  • Different catchment characteristics lead to distinct pollution profiles.

Purpose of the Study:

  • To investigate the spatial and temporal distribution of nitrogen forms (nitrate, ammonium, total organic nitrogen, total nitrogen) in river systems.
  • To classify river reaches based on catchment characteristics and pollution types.
  • To analyze the relationship between nitrogen concentrations, pollution sources, and hydrological factors.

Main Methods:

  • Classification of river reaches into four types: headwater, agricultural non-point source (NPS), urban municipal/industrial, and combined main stream.
  • Monthly water sampling from July 2003 to June 2006 in the Cao-E River Basin, China.
  • Measurement of nitrate (NO3(-)-N), ammonium (NH4(+)-N), total organic nitrogen (TON), and total nitrogen (TN) concentrations.

Main Results:

  • Nitrate concentrations followed the sequence: type IV > type II > type III > type I. Ammonium, TON, and TN concentrations followed: type III > type IV > type II > type I.
  • In urban reaches, TON and NH4(+)-N constituted the dominant nitrogen forms (54.7% and 32.1% of TN, respectively).
  • Ammonium-N decreased with distance from cities, while nitrate-N increased with agricultural land area. Increased river flow correlated with higher nitrate-N and lower ammonium-N.

Conclusions:

  • River nitrogen distribution is strongly influenced by catchment characteristics and pollution sources.
  • Urban and agricultural pollution significantly alter nitrogen speciation and concentration in river systems.
  • Hydrological factors play a role in nitrogen dynamics, affecting concentrations and loads differently across various river types.