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Related Concept Videos

Overview of Nitrogen Metabolism01:20

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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
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Related Experiment Video

Updated: Oct 5, 2025

Assessment of Methane and Nitrous Oxide Fluxes from Paddy Field by Means of Static Closed Chambers Maintaining Plants Within Headspace
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Soil moisture determines nitrous oxide emission and uptake.

Hongshan Liu1, Xiangzhou Zheng2, Yuefen Li3

  • 1Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences/Fujian Key Laboratory of Plant Nutrition and Fertilizer, Fuzhou 350013, PR China; College of Earth Sciences, Jilin University, Changchun 130061, PR China.

The Science of the Total Environment
|February 1, 2022
PubMed
Summary

Soil moisture significantly impacts nitrous oxide (N2O) uptake and production. Higher moisture levels, particularly at 80% water holding capacity, enhance N2O uptake, driven by the nosZ gene, crucial for understanding soil N2O dynamics.

Keywords:
N(2)O uptakeNO(3)(−) concentrationSoil moisturenosZ clade InosZ clade II denitrification

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Last Updated: Oct 5, 2025

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Area of Science:

  • Soil Science
  • Environmental Microbiology
  • Biogeochemistry

Background:

  • Soils are critical regulators of atmospheric nitrous oxide (N2O), a potent greenhouse gas.
  • Denitrification is a primary N2O production pathway, but N2O uptake is often overlooked, leading to underestimations.
  • Soil moisture is a key factor influencing denitrification, yet its precise role in N2O uptake and production, alongside microbial genes, requires further elucidation.

Purpose of the Study:

  • To quantify N2O production and uptake rates under varying soil moisture conditions.
  • To investigate the influence of soil moisture on denitrification genes (nosZ, nirK, nirS) and soil properties.
  • To identify key microbial drivers of N2O uptake in soils.

Main Methods:

  • Utilized the 15N-N2O pool dilution (15N2OPD) method to measure N2O production rates.
  • Experimentally manipulated soil moisture levels to 20%, 40%, 60%, 80%, and 100% water holding capacity (WHC).
  • Analyzed nosZ, nirK, and nirS gene copy numbers, ammonium (NH4+) content, and nitrate (NO3-) concentrations.

Main Results:

  • N2O uptake rates increased with soil moisture, peaking at 80% WHC (4.17 ± 2.74 μg N kg-1 soil h-1).
  • N2O production and net emission rates also peaked at 80% WHC (32.50 ± 4.86 and 27.63 ± 3.09 μg N kg-1 soil h-1, respectively).
  • Increased soil moisture correlated with higher nosZ gene abundance, NH4+ content, and denitrification potential, with nosZ gene numbers identified as the primary driver of N2O uptake, especially nosZ clade II.

Conclusions:

  • Soil moisture is a critical determinant of N2O cycling, significantly enhancing N2O uptake at higher levels (80-100% WHC).
  • The abundance of nosZ genes, particularly nosZ clade II, is a key indicator for estimating N2O uptake.
  • Findings improve understanding of soil N2O sources and sinks, providing a gene-based tool for N2O uptake estimation.