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Related Experiment Video

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Estimating Sediment Denitrification Rates Using Cores and N2O Microsensors
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[Nitrate Source Identification and Nitrification-denitrification at the Sediment-water Interface].

Zan-Fang Jin1, Jia-Lin Gong1, Yi-Li Shi1

  • 1College of Environment, Zhejiang University of Technology, Hangzhou 310032, China.

Huan Jing Ke Xue= Huanjing Kexue
|July 3, 2018
PubMed
Summary

This study investigated nitrate sources and nitrogen transformation at the sediment-water interface in West Lake. Results show sewage is a major source, and denitrification significantly removes nitrate, influenced by temperature and oxygen.

Keywords:
denitrification ratenitratenitrogen and oxygen isotopessediment-water interfacestable isotope analysis in R(SIAR)

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Area of Science:

  • Environmental Chemistry
  • Geochemistry
  • Aquatic Ecology

Background:

  • Nitrate pollution in surface waters necessitates understanding its sources and transformation.
  • The sediment-water interface is a critical zone for nitrogen cycling in aquatic ecosystems.

Purpose of the Study:

  • To identify nitrate sources and transformation mechanisms in West Lake.
  • To quantify nitrogen transformation rates (nitrification and denitrification) at the sediment-water interface.
  • To assess the role of the sediment-water interface in nitrogen removal.

Main Methods:

  • Analysis of columnar core sediment samples collected seasonally.
  • Stable isotope analysis of nitrogen and oxygen (using SIAR).
  • Acetylene inhibition method to measure nitrification and denitrification rates.

Main Results:

  • Nitrate (NO3-) and ammonium (NH4+) concentration gradients were observed at the sediment-water interface.
  • Sewage (manure) was identified as the primary nitrate source (60.8% in summer).
  • High δ15N values indicated significant denitrification, with average rates of 2.85 mmol·(m2·d)-1 for nitrification and 23.51 μmol·(m2·d)-1 for denitrification.

Conclusions:

  • The sediment-water interface plays a crucial role in nitrogen removal in West Lake.
  • Temperature and dissolved oxygen are key factors influencing nitrogen transformation rates.
  • Seasonal and spatial variations in nitrogen cycling were observed.